In the previous two installments of Skeptical Reefkeeping, we talked about how applying skeptical thinking to reefkeeping can help you make decisions about what methodology to follow or which products to use. In this installment, we’ll spend less time exploring the skeptical method, and instead examine how skeptical reefkeeping has impacted, and continues to impact one particular aspect of our hobby: making our hobby more environmentally sustainable.
A brief reminder
Skepticism is a method, not a position. Officially, it’s defined as “a method of intellectual caution and suspended judgment.” A skeptic is not closed minded to new ideas, but is cautious of ideas that are presented without much, or any, supporting evidence. In our hobby there are tons of ideas presented without much, or any, supporting evidence. Being a skeptical reefer essentially boils down to taking advice/products/new ideas with a bucket of salt. Being a skeptical reefkeeper requires that you investigate why, how and if the suggested ideas actually work. As a skeptical reefkeeper, you decide what is best for you, your animals, and your wallet based upon critical thinking.
That sounds like work! Just tell me what to do!
Sorry, I can’t just tell you what to do. I wish I could, but there is that whole Biblical quote “Tell someone what to do and their fish and corals die, get them to understand the bigger complex picture and their fish and corals live”. This hobby is not simple and there are as many opinions about how to keep our glass boxes thriving as there are people with glass boxes. The goal of this series of articles is not to necessarily provide you with reef recipes or to tell you which ideas are flat out wrong or which products really do what they say they do or which claims or which expert to believe – the goal is to help you make those kinds of determinations for yourself in the face of conflicting advice.
The drama of ‘juicing’ fish
The early 80’s was a time of glam rock, hardy elegance corals, and DIY sumps filled with hair curlers for bio media. Back then, rocks covered with hair algae were lovely, panther groupers were the hot fish, and aiptasia were considered fabu. Hardly anyone stopped to think about where animals for our reef tanks were coming from…we were all too busy just trying to keep them alive for more than a month. Fish would come into the LFS; some would make it, and some would slowly waste away despite eating well. Most of us figured we were making some husbandry mistake that resulted in the death of the fish. However, some began to apply skeptical methodology to the problem and hypothesized that the issue might have something to do with the way the fish were being handled somewhere along the way to the LFS.
Cyanide fishing kills fish and corals – which hardly seems to justify the lower prices the practice can create.
It turned out that they were right. Investigation revealed that cyanide, often called ‘juice’ was used to ‘knock out’ fish to make them easier to collect. Sounds good right? Easier to collect means cheaper, cooler animals, and everyone wants cheaper animals. However, the monkey wrench here is that cyanide is a poison that doesn’t necessarily kill the fish outright. Often, the fish seems to recover from the initial shock. It can make it all the way through the chain of custody from the collector to the exporter to the importer to the LFS to the hobbyist tank before it begins to go down hill. We now know that the cyanide can damage the fish’s ability to adsorb food; it can eat like a pig, but get little of the nutrition it needs to live. Eventually, the animal can starve to death.
The Flamboyant cuttle is one of the most amazing animals I have encountered in the wild or in captivity. They are beautiful, masterful predators that live fast and die young. It is my hope that one day they will be bred in captivity and readily available for all cephalopod enthusiasts.
Cuttlefish are the artists of the sea. . They float through the water like oceanic ballet dancers. Their feeding tentacles shoot forward with a speed, accuracy and control that would make a martial artist weep. One minute they have the color and texture of a smooth rock; the next they flash complex three dimensional patterns and suddenly resemble a monster out of Greek myth. While all cuttlefish share these abilities, there is one species that takes these arts to an apex, making the rest look like dull amateurs – the aptly named Flamboyant Cuttlefish.
Hatchling Metasepia with a mysid shrimp in the background for scale. The ‘rocks’ are grains of sand.
The Flamboyant cuttlefish, Metasepia pfefferi, is an astonishing little animal found primarily in muck habitats. These vast, rolling underwater plains of settled silt and mud appear desolate at first glance, but are in fact populated by an unexpectedly large number of strange animals including frogfish, ghost pipefish and a stunning array of nudibranchs. Fitting right in with these odd neighbors, the Flamboyant is normally a master of camouflage blending in completely with the grey substrate. When startled, however, those previously subdued colors change to bright purples, reds, yellows and whites. The colors shine out in coruscating patterns along the animal’s body.
Flamboyants are incredibly bold, even when startled, and will hold their ground while putting on their color show for an amazingly long time. These fantastic displays have helped make ‘muck’ diving popular, have put Flamboyant cuttlefish on the top of underwater photographer/videographers “must shoot list” and have made them a pined-for-but-rarely-obtained aquarium specimen.
Hatchling Metasepia on sand, with all the coloration that adults have.
What’s in a name?
The ‘Flamboyant’ part of the common name is easy to understand, but the ‘cuttle’ or the ‘fish’ part might be a little less straightforward.
The origins of the word ‘cuttlefish’ or ‘cuttle’ have not been been nailed down. According to cephalopod researcher John W Forsythe, “The name Cuttlefish originally came about as the best guess of how to spell or pronounce the Dutch or perhaps Norwegian name for these beasts. It is derived from something like ‘codele-fische’ or ‘kodle-fische’. In German today, cuttlefish and squids are called tintenfische, meaning ‘ink-fish’. I’ve been told that the term fische actually refers to any creature that lives in the sea or are caught in nets when fishing, not just fishes. Anyway, that’s what I understand the derivation of name to be.”
Adult Metasepia.
Recently there has been a movement, at least in public aquariums, to make the names of certain animals more ‘correct’ to avoid confusion. For instance, neither Jellyfish nor Starfish are fish, thus they are now referred to as Jellies and Sea Stars respectively. Perhaps it is time to refer to cuttlefish as cuttles, because they aren’t fish at all. Cephalopod researcher Dr. James Wood sums it up clearly; “Octopuses, squids, cuttlefish and the chambered nautilus belong to class Cephalopoda, which means ‘head foot’. Cephalopods are a class in the phylum Mollusca which also contains bivalves (scallops, oysters, clams), gastropods (snails, slugs, nudibranchs), scaphopods (tusk shells) and polyplacophorans (chitons)”, however unlike their relatives, cephalopods move much faster, actively hunt their food, and seem to be quite intelligent.”
Nuts and bolts
There are actually two species in the Metasepia genus, Metasepia pfefferi, the Flamboyant cuttlefish, sometimes referred to as Pfeffer’s Flamboyant cuttlefish, found from the Indonesia to northern Australia to Papua New Guinea, and Metasepia tullbergi, the Paint pot cuttlefish, found from Hong Kong to southern Japan. Both species are small, having a mantle length of 6-8 centimeters, with the females’ being larger than males. Distinguishing the species visually is difficult, and telling them apart relies on subtle differences in the animals’ cuttlebones.
Metasepia, like all cephalopods, have three hearts (two branchial or gill hearts, and systemic heart that pumps blood through the rest of the body), a ring shaped brain, and blue, copper based blood. They have 8 arms, with two rows of suckers along each arm, and two feeding tentacles tipped with a tentecular club. The shafts of the feeding tentacles are smooth, while the grasping face of the club is covered with suckers, some of which are proportionally huge. The tentacles and tentecular club shoot forward to snare prey and pull it back to the arms. Once gripped by the arms, the preyis manipulated to a beak-like mouth and a wire brush like tongue called a radula, both of which help reduce the prey to appropriate size to be eaten. Reducing the food size is critical because the esophagus actually runs through the middle of the cuttle’sring shaped brain; swallowing something too big might damage the brain.
The Flamboyant’s striking color changes are accomplished by organs in the skin called chromatophores The chromatophores are neurally controlled and allow for instant color changes over the entire skin of the cuttlefish by triggering muscles to change the amount of pigment that is displayed. The skin patterns aren’t necessarily static either, they can move, like animation on a TV screen, and are thought to aid in communication, hunting and camouflage. This is evidenced on the dorsal surface of the mantle where violet stripes can often be seen pulsing across the white areas Metasepia.
In addition, to evade predators or hide from prey, Flamboyants can also change the shape of their skin by manipulating papillae across their bodies to break up their body outline. The larger papillae on the top side of the Flamboyant cuttlefish’s mantle don’t change at all.
Flamboyants use a three-tiered approach for movement. They have a fin that girds their mantle that allows for fine movement, and they can use jet propulsion via water pumped over the gills and through their funnel, which allows for surprisingly fast movement. Most amusingly, Flamboyant cuttles often amble or walk across the substrate using their outside pair of arms and two lobes on the underside of their mantle as ‘legs’. In my experience, Metasepia prefer this walking to swimming and only leave the substrate when extremely threatened or are overly harassed by groups of divers overzealously trying to get the perfect photo.
One of the most well known features of cuttles is the cuttle bone, which is often used by pet owners to provide calcium for caged birds. Cuttlefish use this multi chambered internal calcified ‘shell’ to change buoyancy by quickly filling or emptying the chambers with gas. Interestingly, while the cuttle bone of most cuttles is as long as the animal’s mantle, the diamond shaped cuttlebone of the Flamboyant is disproportionately small, thin, and only 2/3 to ¾ of the mantle length. The small size of the cuttlebone may make swimming difficult and may accounts for the Flamboyants preference to ‘walk’ along the bottom.
Like other cephalopods, Flamboyant cuttles can also produce copious amounts of ink if startled. It is thought that the ink acts as a smokescreen to allow the cuttlefish to escape predation, but most of the Metasepiainking events I have seen have been more along the lines of ‘pseudomorphs’, or blobs of ink that are thought to further aid in escape from predation by presenting the predator with multiple targets.
Toxicity
Recent research by cephalopod researcher Mark Norman, as reported in the episode of the television series NOVA – Kings of Camouflage, takes a step at explaining the weird colors, the fearlessness, and walking behaviors of the of the flamboyant cuttlefish.
According to Norman “Well, it turns out the flamboyant cuttlefish is toxic. It’s as toxic as blue-ringed octopuses. And blue-ringed octopuses have killed humans from their bites, so we’ve got the first deadly cuttlefish in the world. And it’s amazing on a couple of levels. First of all, it’s actually poisonous flesh, the muscles themselves are poisonous. So this is the first time that flesh that is deadly has been reported in any of these groups of animals. And secondly, the toxin itself is not known. It’s some completely different class of toxins. And toxins like those could be the key to whole new discoveries for lots of human medical conditions… This is a fantastic result, because it makes sense of what we’re seeing in the wild. And this toxicity, this poisonousness is probably what’s underpinning the whole weird behavior of the animal. And the fact that a group of animals that normally swim around or spend a lot of time trying to be camouflaged, have become so obvious, have given up swimming, are walking everywhere, it’s like a major step towards a whole new line in the evolution of these animals.”
It is also possible the bite and ink of the Flamboyant contains toxins, so any handling of these animals should be taken with a good deal of caution and forethought.
Lifecycle
Metasepia begin life as tiny eggs laid in crevices or under overhangs or sometimes hidden inside a sunken coconut husk. The eggs are laid individually, and are approximately 8 mm in diameter. Unlike some cuttlefish species, the female does not incorporate ink into the egg mass, so the egg appears to be white or translucent. This makes it easy to see the developing cuttle inside., Hatchlings are roughly 6mm in length at hatching and are miniature versions of adults. These are instant predators ready to get out into the world and start changing colors and eating a diet of mostly small crustaceans, stomatopods and sometimes fish.
A 2 day old hatchling Metasepia. Note the coin is under the container holding the animal.
Like all cephalopods, Metasepia grow very quickly and can reach adult size somewhere between 4 and 6 months after hatching.Adult female Metasepia are larger than males, reaching 8 centimeters in mantle length while males top off at less than 4-6 centimeters in mantle length; this may account for the size discrepancy in descriptions of these animals. Like most cuttles, Metasepia mate by coupling head to head. The male deposits a packet of sperm called a spermatophore, via a groved arm called a hectocotylus into a pouch in the female’s mantle. The mating is very fast, the male darting in, making his deposit, and darting away, perhaps due to the threatening size difference of the mates.
Metasepia have a lifespan of about a year, and the end can be ugly as the animal enters into what is known as senescence. Motor control begins to fail, lesions can appear on the skin, and the cephalopod seems not to care about anything, including food or having arm tips eaten by bristleworms or hermit crabs.
Keeping Metasepia: Ethical considerations
The idea of keeping the more exotic cephs – Wunderpus photogenicus, Thaumoctopus mimicus, and bothMetasepiaspp – has generated much discussion in cephalopod circles, mostly because the size and health of their wild populations is unknown. Even the sharing of information, photos or video of these animals in captivity can be controversial. Some fear that detailed information and attractive photos may encourage inexperienced saltwater aquarists to obtain specimens and encourage over-collection, perhaps impacting the ability of wild populations to recover.
Personally, believe that the admiration of a species can be of benefit to its preservation in the wild rather than its detriment. Experienced cephalopod keepers can and have made positive additions to the overall knowledge about these animals. My hope is that the open sharing of information empowers aquarists to make sound, rational decisions regarding the advisability of keeping these animals.
Keeping Metasepia is not something that should be entered into on a whim and even experienced cephalopod keepers with mature tanks should think long and hard before obtaining this species. Their needs are resource intensive, specific, and not yet fully understood, so if you do decide to take give it a go, take your time and please document your efforts so others can learn from your successes and mistakes.
Getting an animal
The biggest drawback to keeping any cephalopod in aquaria is getting one. Cephalopods are notoriously terrible shippers, often arriving at their destination dead in a bag of ink-filled water. This may have to do with an inherent inability of the animal to deal with the stress of shipping, or it may be because the time and effort needed to ship these animals successfully is not well understood. Either way, currently importers are wary of ordering these animals because of their poor survival rate through the chain of custody.
The aquarium trade does not distinguish between the Metasepia species, and if you are lucky enough to find one, and willing to pay between 300 and 800 dollars US per animal, you really can’t be sure which species you have. I do think that most of the animals that make it into the trade are actually Metasepia tullbergi from Japan where they have been tank raised. Metasepia pfefferi, to be best of my knowledge, have not tank been tank raised anywhere.
What’s even worse about trying to obtain one of these animals for your aquarium is the idea that most of the animals imported are single adult males, which means they may only live for weeks or months and there is no possibility of eggs or breeding. Over the past 7 years I have been able to obtain 3 live Metasepiaspecimens, once driving from San Francisco to Los Angles and back in the same day to give the animal every chance to survive. All were adult males and lived between 2 and 4 months.
Husbandry
A mature aquarium with stable reef like water quality is necessary for housing Metasepia. Water temperature should be approx 78f (25.5c), salinity 33.5-34.5 ppt, pH 8.1-8.4, with ammonia, nitrite and nitrate as close to 0 as possible. Ammonia seems to be particularly problematic for cephalopods so regular testing and an ‘ammonia alert’ card are useful to determine the frequency of needed water changes.
Metasepia and the authors wife in Lembah, Suliwesi.
A good skimmer is necessary to provide oxygen and nutrient export as well as to provide “insurance” for any inking events. Carbon, along with mixed and heated saltwater for water changes is good to have on hand as well for any inking. A good amount of live rock and/or macro algae is a good “bonus” for filtration and shelter.
A substrate area of at least 36×12 inches (standard 30 gallon breeder aquarium) is recommended to provide enough ‘walking’ room for a single animal. I prefer to use a muck substrate substitute like Carib-Sea mineral mud, in combination with 4×6 inch sections of any of the ‘mud’ products available, but since Metasepia don’t dig, a fine sand bottom will also work adequately.
Simple fluorescent lighting is enough for the Metasepia, though something more powerful may be necessary if keeping macro algae or simple non-stinging (Discosoma, Nepthea, Xenia etc) corals along with the cephalopod. High intensity lighting should be fine as these animals are diurnal.
When possible, I like to keep my cephalopod tanks plumbed into a larger reef system. This allows for a larger overall water volume, more stable water conditions and alleviates the need for extra equipment. SinceMetasepia don’t escape from aquariums like their octopus cousins, a tight fitting lid isn’t needed and plumbing into an existing system is easy. Best of all, a tank plumbed into a larger system can be taken off line and put on line very quickly given the availability of Metasepia.
I prefer to not keep any other fish or ceph with the Metasepia. Either the Metasepia will eat the fish or the fish will harass the Metasepia. In reality, these animals are so rare in the trade that I am an advocate of anything that gives them a better chance at survival… which means avoiding annoying tank mates. Clean up crew animals such as snails, hermit crabs in moderation, and bristle worms won’t be eaten by the Metasepia, and will help clean up any uneaten food.
If the Flamboyant arrives in good condition, it may start eating right away – the three I have been able to obtain over the years have eaten within minutes of being released into the aquarium. Metasepia seem to need to eat more than other cuttles, and I suggest feeding them at least 3 times a day. If the animal doesn’t get enough food, it may begin to float at the surface and not be able to fully submerge; it seems lack of food may be related to poor buoyancy control. I have heard accounts of the backs of under-fed Metasepia actually drying out from the animal not being able to get away from the water’s surface.
Almost any live shrimp will be eaten with gusto. I have used live and frozen saltwater ghost shrimp(Palaemontes Vulgaris) and local San Francisco bay bait shrimp (Cragnon spp) with great success. Start with live and then experiment with thawed frozen because one of the most important things you want from a newly imported Metesepia is to get the cuttle eating. Live crabs seem less interesting to Metasepia than to other cephalopods, and thawed frozen krill has been flatly ignored.
Late Breaking News
After 8 years of fruitless effort, I was able to obtain a group of Metasepia for captive breeding at the Steinhart Aquarium in the California Academy of Sciences. While the group suffered 80% loss in the first week, 90% in the first month, we were able to mate one male with several females which then laid eggs. Some of the eggs have developed, and at the time of writing, we have two hatchling Metasepia and several more eggs developing. This is a good, but baby step on the road to being able to keep and breed these animals in captivity. I am working hard to keep the hatchlings alive.
What this experience tells me is that even with all the resources of a Public Aquarium, wild caught, adult Metasepia are difficult to keep alive for any length of time. However, the small success means there is hope on the horizon for studying, appreciating, and breeding this amazing cephalopod in captivity.
Conclusion
The Flamboyant cuttle is one of the most amazing animals I have encountered in the wild or in captivity. They are beautiful, masterful predators that live fast and die young. It is my hope that one day they will be bred in captivity and readily available for all cephalopod enthusiasts.
If you are interested in keeping cephalopods, there are several species that are easily available, better understood and make better starter cephs than Metasepia. Please do some reading on www.TONMO.combefore purchasing any cephalopod.
References and other sources of Information
Hard Copy:
Dunlop, C and King, N. 2008. Cephalopods: Octopuses and Cuttlefish for the Home Aquarium. TFH Publications. 269 pages
Hanlon, RT and Messenger. 1996. Cephalopod Behaviour. Cambridge University Press. 232 pages
Jereb, P. and Roper, C.F.E. (editors). 2005. Cephalopods of the world. Issue 4, Volume 1, FAO. PP 60-62
Norman, Mark. 2000. ‘Cephalopods a world guide’. ConchBooks : pp.86-89
Nesis, KN. 1987. Cephalopods of the World. TFH publications. 351 pages
Octopus chierchiae is an amazing little animal and is clearly worth further study.
Without a doubt, octopuses are intriguing animals. Eight sucker covered arms, three hearts, copper based blood, defensive ink, a bird like beak, phenomenal carnivorous prey-stalking abilities, color-changing skin, eyes with an intelligent gleam and the apparent intelligence to escape the aquarium to explore all make keeping octopus a thrilling and fascinating endeavor.
In recent years there has been much public interest in the so-called ‘zebra’ octopuses – Wunderpus photogenicus and Thaumoctopus mimicus. And with good reason, as these animals can be stunning in coloration, patterning and displays. As their common moniker implies, these octopus can display distinctive black and white stripes over their mantle and arms. But there is another ‘zebra’ octopus that is rarely seen which may turn out to be even more fascinating than its better known cousins – the pygmy octopusOctopus chierchiae.
Richard Ross: The first Octopus chierchiae during acclimation.
Nuts and bolts
Octopus chierchiae is a striking, small octopus. The skin of the adult is usually a creamy color with dark bands bordered by white all over the body and arms. At times, the same individual bands can fade so the whole animal appears creamy with creamy stripes. At other times, that same specimen may become translucent, revealing the branchial, or gill, hearts beating in the animal’s pointed mantle. Finally, that same specimen might a uniform, dark brown. The skin itself alternates between a smooth and a bumpy texture, and there are star shaped papillae around each eye as well as prominent papillae towards the tip of the mantle.
Octopus chierchiae occurs along the pacific coast of Panama and Nicaragua, living in the low inter-tidal zone where they may be periodically exposed to air and may survive in water that collects in rock cavities between tides. Being from this zone, it may be that this species is tolerant of a wide range of temperatures and salinities. Although they have been described in one of the few scientific papers about them as ‘common’, they may not be, or they may simply only be common at certain times of year. We simply don’t know because the science hasn’t been done. One expedition to collect these animals for research was unable to obtain a single specimen. If these octopuses are indeed not common, negative impact on wild populations due to collection is a very real possibility, as these animals are recognizable, andeasy to collect due to the environment they live in.
The lifespan of Octopus chierchiae is currently unknown, but thought to be roughly a year. The longest lived wild caught animal was kept alive for approximately 8 months.
One of the most astonishing features of this species is the female’s ability to lay multiple clutches of eggs over its lifetime. The reproductive strategy for most octopuses is semelparous, laying many small eggs at once and then dying. The small eggs almost always hatch as planktonic paralarvae and are essentially impossible to raise in captivity (although there has recently been some small success in that area). Octopus chierchiaehowever, is iteroparous, and it lays several, smaller clutches of eggs before dying. What makes Octopus chierchiae even more attractive from a breeding standpoint is that the eggs are large, and the hatchlings emerge essentially as miniature adults which makes raising the hatchlings possible in captive environments.
Females are larger than males, reaching a dorsal mantle length of 25mm and 18 mm respectively. The males have a hectocotylus, or grove, on the third right hand arm when the animal is viewed from above that is used to pass sperm packets to the female. It also appears that the males have ‘fringing’ along the tips of the arms that is absent in females.
It is also possible these animals are toxic in some way – their striking coloring and patterning seems very much like warning to would be predators. However, whether the bite is toxic or the flesh is toxic is a question that will have to wait for further research.
History
Octopus chierchiae was first briefly described by G Jatta in 1889. Most of what we know about their lifecycle and behavior comes from a paper written in 1984 by Arcadio F. Rodaniche, along with some first hand observations by cephalopod researcher Dr Roy Caldwell. In the early 1970’s Dr. Caldwell collected severalOctopuschierchiae while doing stomatopod research in Panama, and treated them as a curiosity. This experience was partly responsible for Dr. Caldwell becoming interested in studying pygmy octopuses. It was he who later returned to Panama to collect Octopus chierchiae and was unable to find a single specimen.
Since then, Dr Caldwell has obtained specimens of Octopus chierchiae sporadically, and they have leaked into the pet trade from time to time. The issue with getting them is there are few marine ornamental collectors in that part of South America, and they don’t collect and ship in a consistent manner for any animals, never mind a ‘specialty’ animal like a cephalopod. Dr. Caldwell wrote about them once onwww.TONMO.com (the online source for all things ceph related), but since they were so rare in the trade and in research, I never imagined I would be able to work with them.
As luck would have it…
In early April 2008, I received an email from a supplier asking if I was interested in some zebra octopus they had received from Indonesia. One was a Wunderpus, but the other was clearly something different. It looked like Octopus chierchiae. Later discussion revealed that the specimen did not come from Indonesia, but rather arrived as a stow away in a gastropod shell in a shipment from Nicaragua. I asked for the animal to be shipped to me and went about modifying part of my cuttle system into an octopus system in anticipation of its arrival.
Richard Ross: A male swimming in the water column. Note the ‘fringing’ on the arm tips and the hectocotlys is visable on the arm under the mantle
Roy Caldwell; Octopus chierchiae mating, male on top.
Richard Ross; Female in her barnacle den with eggs getting ready to hatch
Octopus are escape artists, inter-tidal octopus like Octopus chierchiae even more so because they are used to crawling around in areas without much water. They can also be cannibalistic, so keeping them separate is imperative. Luckily, the modifications were fast and straightforward because the system was mature, with Carib-Sea ‘mineral mud’ substrate. All that was needed was some ‘octo proofing’ of part of my cuttle breeding system. The cuttle system was a cube system with the cubes divided by slotted acrylic that an octopus could easily fit though, so I bought some small pored commercially-available aquarium divider material, cut it to size and super glued it in place over the slots while the tank was still full of water. Even though I didn’t think it would be possible for the octopus to escape through the return plumbed into each cube, I also covered the return… the chance simply wasn’t worth taking. I also purchased some large glass tiles to place over each cube and the system was ready to go.
The octopus arrived, was acclimated and introduced into its new home. Its mantle was about 15 mm across, and all of its arms were intact and looked healthy.
I wanted some kind of den or hiding place for the octopus, but wanted to be able to easily check on the animal’s health – and to be sure it hadn’t escaped or died. Some dwarf octopus live in gastropod shells, but such dens would have made it difficult to keep track of the animals because they could easily disappear deep down into the spiral of the shell.. My initial offering, a piece of large vinyl tubing, was ignored, so I replaced it with large individual barnacle shells and the Octopus chierchiae quickly took up residence.
I offered live shore shrimp (Palaemontes v ulgaris) but they were ignored for the first few days, as were local San Francisco bay bait shrimp (Cragnon spp). I collected some local shore crabs (hemigrapsis spp), which were taken with gusto, although that might have been because the octopus were hungry rather than due to a preference for crabs. The crabs stopped struggling within seconds of being bitten which may point to possible toxicity of Octopus chierchiae.
Cephalopood researcher Dr Christine Huffard came byto take a look at the animal and confirm the identification. She alsodetermined that the animal was female. I immediately followed up with the initial supplier, as well as others, asking if they could get more specimens.. If we could get more, not only would we could learn more about them, but we could perhaps establish a breeding population which could benefit both research and hobbyists.
An online retailer had one Octopus chierchiae listed, which I quickly bought. He also told me that they had seen 4 more individuals at their supplier. I immediately sent them more money, but in a heartbreaking turn of events, it turned out that they had escaped into the wholesalers live rock holding tanks… never to be seen again. Fortuitously, when the second Octopus chierchiae arrived it turned out to be a male andDr Caldwell, Dr Huffard and I set up a date the next week to attempt to mate them
I’ll never forget that night, the three of us crowed around a 3 gallon tank, in the dark, with multiple still and video cameras ready to document the cephalopod pornography. When we put the male and female together, they copulated within minutes. The smaller male sized up the female and then quickly jumped on her, inserting his hectocotylized arm into her mantle. The mating lasted several minutes and the animals were then returned to their individual homes. It was like cephalopod Christmas morning.
Here be hatchlings
Two weeks later, a second male arrived, thanks to a donation by a generous and selfless hobbyist. Dr. Caldwell came over to mate the second male to the female. When I went to move the female to the photography tank I discovered a clutch of eggs in her barnacle den.
Richard Ross; 2 day old Octopus chierchiae hatchling over US dime (approx 18mm) for size reference. Coins can contain metals that are deadly to cephalopods, so the coin was actually under the container that contained the octopus.Richard Ross; Octopus chierchiae at day 85.
Roy Caldwell: 4 day old Octopus chierchiae hatchling with chromatophores developing.
Roy Caldwell; 30 day old Octopus chierchiae hatchling on calcarious worm tube used as dens.
Over the next few days, she tipped her den opening down and would walk around her tank as if she were trying to de-evolve back into a snail. If disturbed, she would use her arms inside the barnacle and against the bottom of the tank to ‘suck’ the barnacle to the bottom of the tank. I gently tried to pull up the den to see what was going on inside, but stopped because it was going to take a great deal of effort to separate it from the tank and I didn’t want to risk damaging her or the eggs.
Over the next several weeks I eagerly awaited hatchlings. I was pleasantly surprised to discover that the female would sneak an arm out from under the barnacle to take freshly killed shrimp; according to Rodaniche the females don’t eat during brooding. While waiting for the eggs to hatch, I prepared for hatchlings.
I built a water table to house individual octopus hatchling containers. I took small, clear plastic containers, cut a slot in their sides and glued netting from a commercially available net breeder over the slots. I drilled a hole in each lid and glued a piece of rigid tubing into the hole. I then attached airline tubing to a valved manifold fed by a small power head. I drilled a second hole in the top of each container for feeding. This set up was inexpensive, allowed me to add containers as necessary, allowed me to control the amount of water in each container, and gave me easy access and easy viewing to each container with minimal stress to the hatchling during feeding.
Finally the first hatchlings arrived. I discovered in them one morning, and found them to be an amazing orange color, very different from the adult coloration. They swam in the water column bouncing up and down like fishing bobbers. Over the next 20 days I discovered hatchlings in 1s and 2s, for a total of 23 hatchlings from the first clutch. I fed them small amphipods collected from the aquarium glass elsewhere in the system, and gave them black airline tubing to use as dens – which they ignored. About half of the hatchlings went to Dr. Caldwell’s lab, where they were kept in glass jars with netting over the mouth to prevent escape in a larger aquarium, and were given calcareous tube worm tubes as dens – which they immediately took to.
Richard Ross: Octopus chierchiae hatchling eating an amphipod bigger than itself.
Roy Caldwell: Octopus chierchiae hatchling in an 'arms up' defensive post
As the hatchlings grew they were given larger amphipods both cultured and collected from around the San Francisco Bay. As mentioned earlier, everyone knows that octopuses are amazing predators, but there is something phenomenal about watching a 5 mm long animal hunt, capture and eat a 7 mm long amphipod.
The extended Cephalopod community
For several years now, Octopus chierchiae have been www.TONMO.com’s most wanted octopus, so the obtaining of specimens and the successful breeding of these animals made for excitement among cephalopod enthusiasts. As it happened, a few more Octopus chierchiae had turned up across the country. Since broodstock is a traditional stumbling block to getting captive cephalopod breeding populations established, I asked all three of the people who had an Octopus chierchiae, to send them to me, letting them know that Dr. Caldwell and I would gladly pay for them. If our breeding project was successful, we would send them hatchlings as replacements. We were able to get two more males from generous hobbyists. There was one hobbyist that had a female and ended up with hatchlings, but wasn’t able to get them into the effort. This was unfortunate because we needed the genetic diversity. The hunt for more animals went on for months, but none were to be found and the South American supplier had ceased shipping.
Some Final Details
Two of the hatchlings climbed up the side of their containers, and met a grisly, dried out death. Several more of the hatchlings were lost due to an unfortunate ammonia spike, while others were lost to unfortunate salinity drops. Others were lost for unknown reasons.
The hatchling wet weight at 3 days was 22.3 mg, while at day 123, the wet weight was 330 mg.
The female was mated to 3 males, resulting in 3 clutches laid and 46 discovered hatchlings (some may have undetected on hatching and escaped into the larger system).
There were more male hatchlings than females. The longest lived male survived for 340 days, while the longest-lived female lasted 326 days. Both of these far exceed the lifespan of any wild-caught specimen on record.
Any attempted sibling or oedipal matings resulted in no eggs being laid.
We were not able to obtain any more specimens, so the effort ended after all the animals died.
In conclusion
Octopus chierchiae is an amazing little animal and is clearly worth further study. Every time I speak to a supplier I ask about getting more from South America, but a year and a half has passed without further specimens. It is my hope that someday we’ll succeed in establishing a viable breeding program, and in the process learn more about this fascinating little ‘zebra’ octopus.
References and Resources
Hard Copy
Boyle, PR and Rodhouse, P. 2005. Cephalopods: ecology and fisheries. Wiley-Blackwell, 452 pages
Dunlop, C and King, N. 2008. Cephalopods: Octopuses and Cuttlefish for the Home Aquarium. TFH Publications. 269 pages
Hanlon, RT and Messenger. 1996. Cephalopod Behaviour. Cambridge University Press. 232 pages
Rodaniche AF (1984) Iteroparity in the Lesser Pacific Striped Octopus, Octopus chierchiae. (Jatta, 1889). Bull Mar Sci 35:99–104
In the last installment we talked about the role anecdotal evidence and logical misunderstandings play in how we make decisions about reefkeeping. In this installment, we’ll look at how and why manufacturers make claims about their products, why you might want to be skeptical about them, as well as some practical advice for determining the validity of those claims.It seems you can’t turn around in the reefkeeping world without bumping into another new product that you must have to keep your reef healthy. The claims are usually the same, always some version of one of these:-This product will unlock your reefs potential.
-Cure any and all disease in a reef environment.
-This will change the way you keep your reef.
-You’ll see colors and animal health that you have never before experienced.And my personal favorite:-YOU’LL NEVER HAVE TO DO REGULAR MAINTENANCE ON YOUR TANK AGAIN!The ads are very clear in a roundabout way; Without THIS product your reef sucks.
Honestly, sometimes a new product does work. A lot of them don’t.
Even widely used products occasionally don’t do what they claim but in spite of this, somehow they’ve caught on.
I’m going to tell you the one thing you can learn to do for your reef that will improve it’s condition, and your sanity, from day one: Skeptical Thinking.
What is Skeptical Thinking, Rich?
I’m glad you asked. First, it’s not being a grump. For some people the idea of being a “skeptic” has a negative connotation, but do Shaggy and Scooby Do seem like grumps? They’re skeptics. Think about their show. At the end there never is a monster or a ghost, it’s always, as Tim Minchin would say, “the dude who runs the water slide.”
