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Likely the first group of fishes that comes to mind when thinking small
system stocking are gobies and blennies These mostly small fishes are
delightful in their behavior, generally hardy, mostly easygoing in
terms of compatibility and there are many species available on a
punctuated basis.
The
few downsides to keeping these fishes is their sedentary life style
spending most of the time resting on the bottom, often out of sight.
Some species are compatible with most all other fishes, invertebrates,
but others are very territorial; and sexes, numbers can be important.
Here Ill cover the blenny and blenny-like fishes that are most often
encountered. Don't let this scant coverage steer you from trying other
species you may well encounter; as new, even scientifically undescribed
ones pop up all the time in the trade.
As
with too many groups of organisms, there are a few blenny like (related
blennioid, and just blenny-appearing) groups of fishes lumped as
blennies. For our purposes, practical husbandry, we can and will ignore
particulars of popular categorization and again, list those that occur
to hobbyists as such. The Best
Blenny Choices: Identification/Classification/Distribution:
Blennies and their relatives are a large and
disparate group of principally small, sedentary fishes with long
continuous dorsal and anal fins and stumpy pelvic fins (rather than the
suction-cup like one's of gobies).
The
name "blenny" is about as ambiguous as "bass" or
"eel". All told there are six families of 127 genera and 732
species of "true" Blennioids (a suborder of the largest order
of fishes, Perciformes). They are united for a variety of technical
internal structural similarities that we won't get into (See
Nelson). What you can sort of see from their outsides is
that Blennioids have pelvic fins with usually one embedded spine and
2-4 simple soft rays; and that these fins are inserted in front of the
pectoral fin bases. Look at a "typical" blenny; they have
longer than deep pectorals, generally a long and continuous dorsal fin
(unlike the separated ones of the gobies whom they share the bottom
with), and various "hair", "whisker",
"eyebrow" processes called cirri that add to their comical
appearance. Yes, these fishes are characters. Triplefin
Blennies, Family Tripterygiidae:
You
have to look real close, but these fishes are distinguished by having
three-partitioned dorsal. The 20 some genera, 200 some species of
Triplefins can be further distinguished from similar gobies by the
position of scales, more pointed snouts and how they perch... on their
narrow ventral fins rather than a "goby disc". Some species
live principally in borrowed holes/tunnels in rock, formed by other
organisms. Some notable species:
Tube,
Pike, or Flag Blennies, Family Chaenopsidae
("Key-Nop-Sah-Dee"):
These blennies have elongated scale less bodies that are compressed
somewhat side to side, and have no lateral lines; are otherwise
modified for living in tube-like tunnels. There are nine genera with at
least eighty species, Atlantic and Pacific. Acanthemblemaria,
Chaenopsis, Coralliocetus, Hemiemblemaria, Emblemaria &
Protemblemaria species are sold, mainly to reef
keepers.
True, or
Comb-Tooth Blennies, Family Blenniidae:
This
is the principal family of blennies, having typical scale-less bodies
with large blunt heads that bear their namesake comb-like teeth. There
are some six tribes, fifty three genera with about three hundred fifty
species of true blennies. Atrosalarias, Ecsenius, Meiacanthus,
Petroscirtes, Ophioblennius, Cirripectes, Parablennius, Istiblennius,
Salarias are the genera whose members are most often offered to the
hobby. Mainly Ecsenius spp. are available, useful; the common algae
eating blennies of the genera Atrosalarias and Salarias get too big and
rambunctious for small systems. Likewise, unless they're the only fish
in the system, members of the genera Cirripectes and Ophioblennius are
too territorial to safely place as anything other than solo
presentations. The Genus
Ecsenius:
The
genus Ecsenius deserves special attention in the family
Blenniidae; with forty seven species these are delightful, small (to
four inches) fishes that do superbly well in peaceful fish,
invertebrate and reef systems. Ultramarine ran an article by me on this
genus (Dec. 08, Jan. 09). A collage of my pix of members of the genus
is below.
Petroscirtes: 23 valid species, 31
nominal.
Saber-Tooth Blennies, Family Blenniidae, Tribe
Nemophini: These fishes are marine (excepting Meiacanthus
anema which ventures into brackish and freshwater), found in the
Indian and Pacific Oceans. They are notable for having all their fin
rays unbranched and are long in appearance, some almost eel-like. Five
genera (Aspidontus, Meiacanthus, Petroscirtes, Plagiotremus,
Xiphasia) with about fifty species. The Sabertooth Blenniids of the genera
Aspidontus and Plagiotremus should be avoided at all
costs (unless you want to keep one to a tank by itself or with
non-fishes). These vampires have a pair of enlarged canine teeth in
their lower jaw for ripping scales and bits of flesh from other fishes.
Some do this by stealth, hiding in a hole in the reef and darting out
for a fast-attack chomp. Others are sophisticated underwater
con-artists, closely mimicking benign, even beneficent
fishes. An opposite benefit is conferred by the Forktail
Blenny Meiacanthus oualanensis on the Canary Blenny (one of many
with the same common name), otherwise better called the golden mimic
blenny Plagiotremus laudandus flavus. As you know, very few
fishes tangle with the blennies of the genus Meiacanthus due to
their venom-gland bearing enlarged canines. The canary/golden mimic
blenny, bold phony that it is, swaggers about in upper waters without
fear. The genus Meiacanthus: these beautiful,
delicate-appearing blennies possess strong predator deterrents;
enlarged canine teeth with associated venom glands. Unlike most
Blennioids Meiacanthus have a fully functional swim bladder and
"strut their stuff" above the bottom with
impunity. Despite their fangs, the genus makes good general
aquarium and reef tank additions, being left and leaving other fishes
alone. Though the genus' venomous bite does not rival a stone or
lionfish sting it is painful to humans. I would avoid
hand-feeding them. The Yellow, Forktail, Vampire or Canary Blenny
Meiacanthus ovaluanensis should definitely be mentioned. It is a
standard blenny offering. Two of my other favorites in the genus are
the longitudinally striped M. grammistes and M.
atrodorsalis, though there are plenty more. There are twenty two
described species in this genus.
Petroscirtes: Ten described
species.
Family
Labrisomidae: Labrisomid Blennies; some of these are livebearing
(Xenomedea & east pacific species of Starksia).
Several Labrisomids live in close conjunction with sea anemones and
have protection from their stings. Sixteen genera with about a hundred
species; Atlantic and Pacific, mostly tropical. Genera I've seen
offered in the trade are Labrisomids, Starksia, Neoclinus, Exerpes,
Paraclinus, Dialommus, the worm-like Stathmonotus, and
Xenomedea.
Selection: Picking out the right species that are clean,
not-too-badly beaten by catching and transport is absolutely critical
with these fishes. Blennies are tough, tough, tough, given that
they are tropical species (for warm water systems), haven't been
"thermally challenged", or thwacked by careless
handling: Caution: Re Cold Water Species: Many of the
blennies sold in the trade are temperate, even cold-water organisms
that won't sustain the rapid move to tropical aquariums. Don't
be fooled; cool/cold water marines will generally live for a few days
to weeks before dying "anomalously". You need to consult two
or more reference works to determine which species you're looking
at and its needs. By all means DO keep the cool/cold water blennies
if you have a chilled tank/cool water reef system; they are great for
such systems. I prefer some of the Blennius and
Parablennius. Collecting & Shipping Damage: Is
difficult to assess with such small and secretive fishes, but
necessary. Blennies are scaleless or have small embedded scales; they
are otherwise protected from physical injury by their copiously slimy
bodies (another common name for the blennies is slimefishes). If they
are roughly handled or scrubbed clean of mucus by physical insult or
water quality causes they can perish quickly. Look closely at their
undersides and fin origins for evidence of reddening. Closely observe
all the specimens offered; when one breaks down, very often the rest
will as well. Alertness: Being target food organisms, the
Blennioids are aware of all in their environment. Specimens offered for
sale should be looking around, and conscious of your presence.
Don't buy dazed blennies. Feeding: The last thing blennies do before
dying is not breathing, it's eating. For their size, these groups
are huge gluttons. Should a prospective buy refuse food, something is
very wrong.
Habitat/Display: Many blennies are prodigious diggers that
appreciate a bottom with mixed size rubble and gravel. You should know
that such blenny species will not ever be satisfied with having dug
under any and everything. They literally dig until they die; arrange
your decor accordingly. Rock, coral et al. that can be toppled, will
be. About jumping: With their big heads and elongate
bodies you might think these fishes incapable of launching themselves
out of your tank. Think again, they are notorious jumpers. Keep your
tank covered. Territorial
Behavior: There are blenny species that are easy going with
their own kind and others, and some that are very quarrelsome. When,
where in doubt keep them one species and specimen to a small
tank. Predator/Prey Relations: Yes! Blennies are for the most part food items for
predatory fishes and invertebrates. They need more than just to be kept
apart from large mouths to feel safe; provide plenty of cover, nooks
and crannies. Introduction/Acclimation: This may sound a little strange, but blennies
should be "Boris Karloff'ed". Like a mad scientist, you
ought to pour off their shipping water, and "mixed" system
water a few times to dilute the slime and other chemicals they produce
in transit. Finally, lift the specimen and place it in the system and
toss the mixed (and now diluted) shipping and system water. Blennies
produce and release chemicals that affect their and other fish behavior
and this procedure will help you dilute their effect. Turn the system lights down or off for the first
few days on placing new shy fishes like the blennies. Reproduction: Almost all blennies produce large demersal
(bottom) eggs that they place in a sheltered hole. And talk about
women's liberation, the male alone tends and defends the eggs after
spawning. Males tend to be larger than females; sometimes
they are also differently colored, mostly during
spawning.
Foods/Feeding: Most of the blennies are carnivores that can be
coaxed to join their omnivorous brethren in consuming small
invertebrates (brine shrimp, Mysids, worms...) and algae, flakes, even
pellets in captivity. Note that their food must be small enough to just
swallow; blennies do not chew. Close: Are you looking for small, intelligent to the
point of being charming "bottom" fishes? Look no further, but
do investigate the species you have in mind or tank. Blennies and
smaller blenny-like fishes are indeed interesting, hardy and
long-lived, as long as you have yours in the right temperature regime.
Bibliography/Further Reading: Baensch, Hans A. & Helmut Debelius. 1994.
Marine Atlas, v. 1. MERGUS, Germany. Brown, Gregory W. The Combtooth blennies, from the
kelp forests to the world's coral reefs. Discover Diving
3,4/92. Burgess, Warren E., Herbert R. Axelrod & Ray
E. Hunziker. 1990. Atlas of Aquarium Fishes, v. 1. Marines. T.F.H.
Publ. NJ. Dakin, Nick. 1992. The Book of the Marine
Aquarium. Tetra Press. Fenner, Robert, 08-09. Blennies of the genus
Ecsenius. Ultramarine Magazine 12/08-1/09. Howe, Jeffrey C. 1995. Original descriptions;
Cirripectes alleni, Ecsenius randalli. FAMA 10 &
11/95. Hunt, Philip. 1993. The midas touch. TFH
2/93. Hunt, Philip. 1995. The vampire canary
(Meiacanthus). TFH 5/95. Kahl, Burkhard. 1972. Blennies of the
Mediterranean. Aquarium Digest International 1:2(72). Nelson, Joseph S. 1994. Fishes of the World, 3d
ed. John Wiley & Sons, NY. Parker, Nancy J. 1976. Piscatorial clowns. Marine
Aquarist 7(4):76. Pyle, Richard L. & A. Privitera. 1990. The
midas blenny Ecsenius midas Starck. Robertson, Graham C. 1975. North Sea blennies.
Marine Aquarist 6(1):75. Thresher, R.E. 1984. Reproduction in Reef Fishes.
T.F.H. Publ., NJ. Triplefins Bibliography Burgess, Warren E. 1996. New Triplefins from
Taiwan. TFH 4/96. Howe, Jeffrey C. 1994. Original Descriptions:
Enneanectes reticulatus. FAMA 4/94. Pholidichthys Bibliography Chlupaty, Peter. Undated. P. leucotaenia-
the white-striped eel goby. Aquarium Digest International
#34. Wirtz, Peter. 1991. Goby or blenny. TFH 10/91. |
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