spot gobies or Signigobius
biocellatus are members of the
This is a rather large family consisting of over 2,000 individual
more than 200 genera. Two spots are indigenous to the Indo-Pacific.
form the Philippines
south to Australia.
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species has the elongated cylindrical body one would
expect to find in a goby.
more interesting aspects of gobies is their wide variety of coloration
patterning. Two spots are yet another example of these variations.
the exotic coloration typical of many gobies, this species is rather
appearance. It has a light tan body splattered with brown and pale
markings of various shapes and sizes. This
coloration makes it blend in almost seamlessly against the backdrop of
ocean floor or while perched atop a rock formation.
characteristic of this species is its two dorsal fins.
These fins stand
on the fishes back. They are taller than the fish’s actual
body. Each of theses
fins has a large false eyespots meant to confuse predators. When this
viewed from the side, it looks very much as if you are staring into the
a fish two to three times its size. It is these two eyespots (ocelli)
the fish is named. These fish are also sold by the aquarium industry
names; twinsspot goby, signal goby, and crabeye goby.
spots are bottom dwellers. As with many bottom dwellers,
this is primarily a scavenger fish. These fish sift through sand in
food. They are also burrowers. Two spots use their mouths to carry away
and rubble in the construction of their burrows. An aquarium with an
supple of live rock and living sand as a substrate will emulate their
habitat, provide them with a secondary food source, and prevent them
accidentally damaging themselves.
is a small, exceptionally mild mannered fish. They only
grow to an average length of 2.5 inches. They make wonderful additions
to both multi-species
and marine reef aquariums. These gobies should not be housed with
even moderately aggressive fish. Unlike most bottom dwellers, two spots
tolerant of other bottom dwelling fish. They may however exhibit
behavior toward conspecifics. A mated pair may be successfully housed
Depending on the population of your aquarium, this species can be
housed in as
little as a 10 gallon tank. This is a short-lived species. Their
span is only about two years. Two spots have a moderate care level.
They can be
raised by intermediate saltwater aquarists.
spots are carnivorous. They should take readily to flake
food or pellets formulated for meat eaters. To keep them healthy and
their diets should be supplemented with mysid or brine shrimp or any
supplement commonly fed to marine carnivores. They should be fed 1-2
Two Spot Gobies
nature, this species is most commonly observed in pairs.
They are monogamous by nature. Male-female couples cohabitate in the
burrow. A sexually mature fish will commonly starve itself to death if
separated from its life mate.
This species is known to
in captivity. Their spawning
habits are indeed quite unique. The female will first enter the burrow
deposit her eggs. She will then seal the male in the burrow for the
eggs to be
fertilized. The male will remain in the burrow for 2-3 days. During
the female will periodically unseal the burrow and release the male.
may eat or the couple may perform routine maintenance on the burrow.
objective has been achieved, the female will reseal the male in the
Eventually the male will permanently exit the burrow. The couple will
construct another burrow or reopen a previously abandoned one. When the
that acted as a nursery is unsealed again, a single juvenile will