News / Industry News & Events / Mediterranean Stunner: The Red-Black Triplefin Blenny (02/11/19)

Mediterranean Stunner: The Red-Black Triplefin Blenny

02/11/19

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Last weeks CORAL Newsletter teased a beautiful little red Corvette of a mystery fish, this stunning bottom-dweller from the intertidal zone, which is a fish few have likely seen or might recognize. We left out one important detail: the Red-Black Triplefin Blenny (Tripterygion tripteronotum, sometimes misspelled as T. tripteronotus) is a native of the Mediterranean and Black Seas, not exactly prime collecting locations for the marine aquarium trade.

The small mature size and sexual dichromatism of the Red-Black Triplefin only add to the allure of this fish!

Fishes from the Mediterranean tend to be viewed as coldwater or subtropical marine aquarium fishes; as such, the main interest in them mostly comes from the institutional world of public aquariums. However, before you write this species off completely, CORAL Magazine has in fact covered this and other related fishes from the Mediterranean in our pages before. Specifically, Mediterranean Blennies in Nature and in the Aquarium by Harold Weiss, published in the BLENNIES issue of CORAL, the April/May 2008 issue. With such a stunning fish, one has to ask, could we keep them in our aquariums?

Red Sea Links

Before we dive into some care information, its worth noting that the Suez Canal, which links the Mediterranean with the Red Sea, has allowed for the exchange of species between these two bodies of water. Several fishes we recognize as tropical coral reef dwellers have become established in the Mediterranean, including Lionfishes (Pterois miles and P. volitans), Bluespotted Cornetfish (Fistularia commersonii), Rabbitfishes/Spinefoots of the genus Siganus, and two corallivorous butterflyfishes which have adapted to life in the wild without the availability of their normal diet, the Hooded Butterflyfish (Chaetodon larvatus) and the Blacktail Butterflyfish (Chaetodon austriacus). Multiple Angelfish species have been encountered in the Mediterranean, including the Maculosus or Map Angelfish (Pomacanthus maculosus) and Emperor Angelfish (P. imperator), although its unclear if these have established reproducing populations.

Oil-Rig Stowaways

But the Suez Canal is not the only route available for colonization of the Mediterranean by non-native invaders; slow-moving oil rigs serving as mobile reefs are thought to be responsible for the spread of hitchhiking Atlantic Angelfish species, including the Queen (Holacanthus ciliarus) and the Guinean/West African Angelfish (H. africanus). There are many more non-native species making headway into the Mediterranean; these are just the species that marine aquarists will likely be familiar with.

Why mention this invasion? Well, the establishment of tropical species in the Mediterranean might suggest that native fishes sharing the water with these invaders might actually perform acceptably in the aquarium hobby. So while a species like the Red-Black Triplefin is likely to be viewed as a coldwater species, its wide range along the entire coast of this sea suggests that specimens collected from the south, particularly closer to the southeast by the Suez Canal, are probably better thought of as subtropical populations that would do well in home aquarium care.

Collection & Breeding Potential

While a single blenny is probably not enough to warrant the entire establishment of an aquarium collection outpost in the Mediterranean, if the populations of other ornamental foreign invaders are established and of sufficient size, one could argue that a fishery which targeted them for the aquarium trade might not be a bad thing, and maybe wed have access to some interesting new species for breeders to work with as well. Of course, for all we know, the Canal may have already allowed for an apparently tolerant species like the Red-Black Triplefin to make its way into the Red Seaperhaps collectors should keep an eye out for it!

Aquarium Husbandry of Red-Black Triplefins

Turning to the pages of CORAL, Harold Weiss offers an in-depth look at the husbandry of these temperate blenny species. He pays particular attention to the issue of temperature, which could be important depending on where these fishes were collected, or if one is hoping to initiate seasonal breeder patterns.

Temperature deserves special attention, begins Weiss. The Mediterranean lies in the temperate zone and is subject to a completely different climate than the tropical oceans. While water temperatures rise significantly during the summer, they drop quite a bit during winter. Shallow bays, as well as tidal pools (often populated by blennies), may reach 86 degrees Fahrenheit (30 degrees Celcius) or more in the summer. Therefore, higher temperatures in a tank for blennies during the summer wont do any harm (unless the animals are those that live in the lower layers of the ocean). In the winter, however, the northern Mediterranean (that is where most of the animals in our [European] aquarium will come from) can reach freezing temperatures on the surface, and lower layers will keep a more or less constant temperature of around 57 degrees Fahrenheit (14 degrees Celcius)in their natural habitat, this is where the fish take refuge during the cold season.

So, we need to lower the temperature in the tank to around 61 degrees Fahrenheit (16 degrees Celcius). This can be achieved through a chiller or by placing the aquarium in a cool area of the house like the basement or another unheated room. It takes such cyclical changes to get the fish ready to spawn in the spring. I used to keep my Peacock Blennies (Salaria pavo) at room temperature throughout the year: The male would run through its mating ritual with gusto, but the female exhibited no inclination to spawn and apparently didnt quite know what to make of the males advances. After we emulated the wintery drop in temperature, the fish were up to the task: The females showed their readiness with their round bellies, and the males displayed their gorgeous mating coloration, while trying to lure the females into their caves to spawn with highly ritualized dances. Aquarium propagation has actually been successful in a few species (Bscher 1976; Casimir & Hekrner 1926; Maler 1988).

Should you ever be lucky enough to obtain the Red-Black Triplefin, Weiss published some critical husbandry considerations for the species. The Red-Black Triplefin is completely different in its behaviors [compared to other blennies mentioned in the article]. It is constantly on the move, looking for food and nibbling on what it finds. This behavioral pattern is similar to the dragonets (such as the tropical Synchiropus spp.). If their diets are not supplemented with live food (brine shrimp, midge larvae), these fish tend to become lethargic and eventually refuse food altogether (Helmut Simack, personal communication). It is virtually impossible to keep two males of this species in the same tank, but females are always welcome as members of the males harem.

While Weiss husbandry notes and the general lack of availability of the species are probably enough to put most aquarists on the path to more accessible species, there are always aquarists seeking to venture into new territory or go well off the beaten path. If youre on the fence, the following video examples of the species in the wild might be what it takes to push you over the edge! You can learn a little bit more about the Red-Black Triplefin in our original Mystery Fish post. But if youre simply not a fan of bright crimson fishes in general, the Mediterranean holds another secret for you. The related Black-faced Blenny, Tripterygion delaisi, might have your heart racing.

And while these triplefins may never find their way into the aquarium trade, you can always discover more information on tropical Triplefins, including the recent description of a new species from the Caribbean.