For September, I'll bring the genus Gobiosoma
into the limelight. Also known as the Cleaner Gobies, a shroud
of confusion sometimes hangs over this genus, most likely
because of their common name. It is true that some of the
gobies in Gobiosoma "clean," but not all
of them do so. I'll attempt to explain the differences and
the reasons for the confusion with nomenclature, as well as
introduce you to some interesting little fish.
Meet the Family
From mud bottoms to rocky outcroppings,
from open sandy bays to inside sponges and gorgonians, from
the equator to the polar circle, from freshwater to marine
environments, Gobiidae have truly conquered the water world.
In fact, the Gobiidae family is the largest family of marine
fish, consisting of over 2,000 species, yet, the members of
this family are amongst the smallest of marine fish. Presumably,
their overall range and size are two of the main reasons that
new goby species are still being discovered on a regular basis.
Most Gobiidae are characterized by a few
notable attributes. Other than the few gobies that swim above
the substrate, most lack a swim bladder and lateral line.
However, gobies have sensory ducts around their heads that
make up for the loss of the lateral line (Smith, Knopf, 1997).
Another interesting characteristic is the ventral fins, which
in most gobies have joined as one and developed small suction
cups on the end. Also, every goby is a demersal spawner with
most species having both parents acting as guardians over
the eggs (Smith, Knopf, 1997). Some gobies will even produce
sounds during courtship or territory disputes (CIBRA)!
Among their most notable behaviors, however, are their symbiotic
relationship with pistol shrimp, and the "cleaning"
activities that some partake in. I'll leave the symbiotic
relationship with shrimp for discussion in a future article
and will instead concentrate on those "cleaners."
|
An
unidentified Gobiosoma (Elacatinus) in a home
aquarium. The obvious gold spot on the nose is a key
factor in correct identification, but it cannot be correctly
identified without viewing the tail. Photo courtesy
of Mark J. Boenisch.
|
Gobiosoma species comprise a small
fraction of the Family Gobiidae. Their exact classification
is rather sketchy, and apparently is about to change. The
currently recognized reference for Gobiosoma sp. is
the only work that was ever published on this genus (Bohlke,
Robins, 1968). It divided Gobiosoma into 5 subgenera
(see below). This was rewritten and Elacatinus was
elevated to a genus with Tigrigobius as a subgenus
of Elacatinus and Gobiosoma was left with 3
subgenera: Aboma, Gobiolepis, and Gobiosoma
(Hoese, 1971). This work was never published, and thus we
cannot legitimately use it as a taxonomic reference. Unfortunately,
it has been used on occasion, contributing to some of the
confusion. Furthermore, as indicated above, this genus is
about to be taxonomically revised (Van Tassell, pers. comm.).
Once finally published, Elacatinus will be a valid
genus without a subgenus, Tigrigobius will most likely
be split into 2 genera, and Gobiosoma may or may not
have a subgenus. There may also be 2 new genera: Aboma
and Gobiolepis. Ginsburg (1939) originally placed Gobiolepis
as a subgenus to Garmannia. In his unpublished thesis,
Hoese later moved Gobiolepis as a subgenus from Garmannia
to Gobiosoma and in the upcoming revision it may be
raised to generic status (Van Tassell, pers. comm.).
Gobiidae:
°
Austrogobius
|
§grosvenori
§hemigymnum
§parri
§spilotum |
|
°
Elacatinus
|
§atronasum
§chancei
§evelynae
§figaro
§genie
§horsti
§illecebrosum
§louisae
§oceanops
§prochilos
§randalli
§tenox
§xanthiprora |
|
°
Garmannia
|
§chiquite
§hildebrandi
§homochroma
§nudum
§paradoxum
§robustum
§schultzi
§spes
§yucatanum |
|
°
Gobiosoma
|
§bosc
§ginsburgi
§heterolepidotum
§longipala |
|
°
Tigrigobius
|
§dilepis
§gemmatum
§inornatus
§janssi
§limbaughi
§macrodon
§multifasciatum
§nesiotes
§pallens
§puncticulatum
§saucrum
§zebrella |
|
|
|
The taxonomic classification is in a state
of flux, not an uncommon occurrence for such a large and important
family. Consequently, the reader will find many other variations
in the classification of Gobiosoma, adding to the confusion
when studying this genus. The classification chart above was
the most current I could find.
|
The photo on the
left shows the nose shot of Gobiosoma (Elacatinus)
figaro. However, until you see the tail shot of
the same fish (right) it would be impossible
to tell if the photo on the left was Gobiosoma (Elacatinus)
figaro, Gobiosoma (Elacatinus) xanthiprora,
or Gobiosoma (Elacatinus) louisae. Photo courtesy
of John Link.
|
In the Wild
All Gobiosoma species hail from
the Atlantic Ocean. They are geographically spread out, ranging
from off the coast of New York to Northern South America.
Depth seems to be unimportant in their distribution since
they can be found from 3 feet down to 150 feet or deeper.
The type of location where they can be found, however, seems
to play an important role. The "non-cleaners" are
usually located within tube sponges, and sometimes even small
caves or crevices. The key word in the above statement was
"within" since safety is their primary concern,
and they generally like to stay out of harm's way. The "cleaners,"
on the other hand, can always be found in plain view. On a
recent diving trip, I witnessed the vast majority of "cleaners"
sitting on Montastraea spp. and Diploria spp.
It is frequently on these corals that the "cleaners"
set up shop, often called "cleaning stations."
|
A pair of Gobiosoma
(Elacatinus) oceanops awaiting their next client
at their 'cleaning station.' Photo courtesy of Ken Hahn.
|
By now I'm sure some of you are curious
as to what all this talk of "cleaners" and "cleaning
stations" is about. Simply put, the "cleaning"
gobies remove, or "clean," ectoparasites from other
fish, and in some cases dead skin, tissue, or scales. The
"cleaning stations" are the locations of this community
service that the gobies perform. The fish that the gobies
"clean" are referred to as "clients."
These "clients" approach the "cleaning stations"
as needed, and in most cases, change color to some degree.
Little research has gone into the exact reasons for the color
change. However, many biologists believe it is either a signal
that the "client" is ready to be "cleaned,"
or the change in color makes the ectoparasites more visible
to the "cleaner." Once the cleaning begins, the
"client" will often extend or stretch every fin
and mouth. The dorsal fins are fully opened, gills flared,
and mouth gaping open. The "cleaner" will search
the entire "client," often times venturing into
the mouth without fear of repercussion (DeLoach, 1999).
|
On the left
is Acanthurus achilles exhibiting normal coloration
in a home aquarium. On the right is the same
Acanthurus achilles, note how the color of the
fish has changed. These photos are a perfect example
of the color change that takes place prior to, and during,
a cleaning. Photos courtesy of Ken Hahn.
|
This is a form of a symbiotic relationship.
The goby benefits by receiving a meal, while the "client"
benefits with improved health. Since both partners benefit,
this symbiotic relationship is known as "mutualism."
For additional references, not listed below, that have more
information on the symbiotic relationship betweens cleaner
gobies and their clients, readers are encouraged to contact
me directly.
It is not fully understood if these cleaner
gobies are obligate feeders of ectoparasites in the wild,
as little research has gone into their diet. We do know, however,
these "cleaners," much like their "non-cleaner"
cousins, make excellent transitions into the home aquarium.
In the Home Aquarium
Utilizing traditional acclimation procedures
will often times yield a successful transition. The recent
increase in captive-bred specimens has most likely helped
in this area. Facilities such as Ocean, Reefs, and Aquariums,
Inc.(ORA) have made
cleaner gobies regularly available at the wholesale level.
The type and setting of the aquarium that
suits Gobiosoma spp. will vary, depending on whether
they are "cleaners" or "non-cleaners."
"Cleaners" adapt well to most aquarium habitats.
The horizontal stripe from head to tail is apparently an "international
signal" for a cleaner fish, and thus even Indo-Pacific
animals will not harm the Caribbean "cleaners."
The main consideration concerning "cleaners" revolves
around providing them with enough food. Despite being "cleaners,"
they do very well in home aquariums receiving traditional
aquarium fish foods. The food, however, must be small enough
to fit into their tiny mouth! Crushing small portions of the
various flake foods, or pulverizing any of the frozen foods
on the market is of paramount importance.
Though predatory fish will most likely
leave the "cleaners" alone, it is likely the "cleaners"
will be unable to compete with the larger, more aggressive
fish for food. Direct feeding may be necessary in tanks that
have fish that are highly competitive during feeding time.
An easy method of direct feeding is to use a turkey baster.
Thaw or soak the fish food in a small portion of aquarium
water, and suck the food into the baster. Using the baster,
squirt the food in the direction of the waiting goby.
|
Gobiosoma
(Tigrigobius) macrodon in a home aquarium.
This little guy rarely gets collected, though it occassionally
shows up in an aquarium as a hitchhiker on live rock
from Florida. Photo courtesy of Josh Waites.
|
"Non-cleaners" are not as easy
to care for. They lack the horizontal stripe, and in some
cases they have vertical stripes. In other words, it is best
for them to stay out of the sight of predators. In the home
aquarium, this translates into keeping these Gobiosoma
spp. in a very peaceful aquarium. Smaller aquariums may offer
more viewing possibilities, and should also make it easier
to ensure they receive enough food. Other small, non-threatening
fish make excellent tank mates. In most cases, small fish
like firefish (Nemateleotris spp.) will also assist
in comforting your Gobiosoma sp., which often leads
to more viewing time of the goby. Other Gobiosoma species,
in this respect, are also quite helpful in re-assuring one
another. Smallwood and Jeffery (1997) have noted that up to
40 or more different Gobiosoma species will live together
within a square meter. I have successfully kept 10 Gobiosoma
sp. (2 G. (Elacatinus) oceanops, 4 G.
(Tigrigobius) puncticulatum, 4 G. (Tigrigobius)
multifasciatum) together in a 29 gallon aquarium.
|
Originally without
a scientific name and known only by its common name
'Widebanded Cleaner Goby,' this little guy now has an
official name! This little non-cleaner can now be referred
to as Gobiosoma (Elacatinus) limbaughi. Photo
courtesy of James L. Van Tassell.
|
One last consideration for both "cleaners"
and "non-cleaners" is removal of any predatory crustaceans.
Large crabs, lobsters, and mantis shrimp should not be present
in a Gobiosoma sp. aquarium. These ambush style predators
will make quick work of the small gobies.
Compatibility
chart for the “non-cleaning” members of the genus Gobiosoma:
Fish
|
Will Co-Exist
|
May Co-Exist
|
Will Not Co-Exist
|
Notes
|
Angels, Dwarf
|
|
X
|
|
Most dwarfs should ignore Gobiosoma.
|
Angels, Large
|
|
X
|
|
Should ignore the small gobies, but the gobies will
have a tough time getting enough food. May not see gobies
out in the open.
|
Anthias
|
X
|
|
|
Excellent choice.
|
Assessors
|
X
|
|
|
Excellent choice.
|
Basses
|
|
|
X
|
Most adult Basses can consume Gobiosoma sp.
|
Batfish
|
|
|
X
|
Aggressive swimmers and feeders.
|
Blennies
|
X
|
|
|
Excellent choice.
|
Boxfishes
|
|
|
X
|
Overall size will keep the Gobiosoma hiding.
If it does appear, it may become food.
|
Butterflies
|
|
X
|
|
Aggressive swimmers and feeders.
|
Cardinals
|
|
X
|
|
Some adults species may be able to consume Gobiosoma
sp.
|
Catfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Comet
|
|
X
|
|
Large adults may consume Gobiosoma sp.
|
Cowfish
|
|
|
X
|
Overall size will keep the Gobiosoma in hiding.
|
Damsels
|
|
|
X
|
Most Damsels are too aggressive for Gobiosoma
sp.
|
Dottybacks
|
|
|
X
|
Will attack and kill Gobiosoma sp.
|
Dragonets
|
X
|
|
|
Excellent choice.
|
Drums
|
X
|
|
|
Excellent choice.
|
Eels
|
|
|
X
|
Will consume Gobiosoma sp.
|
Filefish
|
X
|
|
|
Excellent choice.
|
Frogfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Goatfish
|
|
|
X
|
Large adults can consume Gobiosoma sp.
|
Gobies
|
X
|
|
|
Excellent choice.
|
Grammas
|
X
|
|
|
Excellent choice.
|
Groupers
|
|
|
X
|
Will consume Gobiosoma sp.
|
Hamlets
|
X
|
|
|
Excellent choice.
|
Hawkfish
|
|
|
X
|
Adults may consume Gobiosoma sp.
|
Jawfish
|
X
|
|
|
Excellent choice.
|
Lionfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Parrotfish
|
|
|
X
|
Aggressive swimmers and feeders.
|
Pineapple Fish
|
X
|
|
|
Excellent choice.
|
Pipefish
|
X
|
|
|
Excellent choice.
|
Puffers
|
|
|
X
|
Will consume Gobiosoma sp.
|
Rabbitfish
|
|
X
|
|
Aggressive swimmers and feeders.
|
Sand Perches
|
|
X
|
|
Adults can be aggressive.
|
Scorpionfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Seahorses
|
X
|
|
|
Excellent choice.
|
Snappers
|
|
|
X
|
Adults may consume Gobiosoma sp.
|
Soapfishes
|
|
|
X
|
Adults may consume Gobiosoma sp.
|
Soldierfish
|
|
|
X
|
Adults may consume Gobiosoma sp.
|
Spinecheeks
|
|
X
|
|
Adult size can be intimidating.
|
Squirrelfish
|
|
|
X
|
Adults may consume Gobiosoma sp.
|
Surgeonfish
|
|
X
|
|
Aggressive swimmers and feeders.
|
Sweetlips
|
|
X
|
|
Adult size can be intimidating.
|
Tilefish
|
X
|
|
|
Excellent choice.
|
Toadfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Triggerfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Waspfish
|
|
|
X
|
Will consume Gobiosoma sp.
|
Wrasses
|
|
X
|
|
Aggressive swimmers and feeders.
|
Note: While many of the fish listed are
good tank mates for the “non-cleaning members”
of the genus Gobiosoma, you should research each fish
individually before adding it to your aquarium. Some of the
fish mentioned are better left in the ocean or for advanced
aquarists.
Captive Reproduction
Spawning of Gobiosoma species in
the home aquarium has become quite common in recent years.
The only hindrance to rearing the fry at this time is providing
them enough food. Thankfully, there is a wealth of information
available from commercial breeders, universities, and private
individuals that can make the procedure less daunting.
Gobiosoma individual females can
lay between 200 and 800 eggs. These usually take 5 - 10 days
to hatch, depending on water temperature, water current, and
species. The female will attach the eggs within a cave or
shell. The male will then fertilize the eggs externally. Once
hatched, the fry remain larval for up to 28 days, at which
time they gain pigmentation and settle to the substrate.
For more detailed information regarding
the spawning and rearing of the fry, please follow the links
provided below in the references. Some excellent information
is offered in these links.
Meet the Species
Probably the most common cleaner goby in
the aquarium trade is Gobiosoma (Elacatinus)
oceanops, also called the Neon Goby. In the wild they
can be found individually, or in groups of 30 or more individuals.
In the home aquarium, individuals of this species have been
noted to fight with conspecifics when groups are kept in small
aquariums (<20 gallons). Like all cleaner gobies, they
can be found throughout the Caribbean, and reach a maximum
of 2" in length.
|
Another remarkable
photo of Gobiosoma (Elacatinus) oceanops.
Photo courtesy of Jim Belcher.
|
|
This Neon Goby takes
a break by resting on a coral after his recent cleaning
episode with the Achilles Tang in the photo above. Photos
courtesy of Ken Hahn.
|
The most sought after cleaner goby for
an aquarium is Gobiosoma (Elacatinus) randalli,
or the Yellownose goby. Their bright gold stripes often catch
the eyes of most hobbyists. At one time they were rare in
the hobby, only being imported from Brazil. Today, they can
be easily obtained from wholesalers such as ORA.
|
The Yellownose goby,
Gobiosoma Elacatinus randalli, resting on a coral
in the wild. Photo courtesy of Andrew J. Martinez.
|
A recent addition to the list of cleaners
is a hybrid, thanks to the continued efforts of ORA. Commonly
called the Hybrid Cleaner Goby by ORA,
this fish is a cross between the 2 most common cleaners, Gobiosoma
(Elacatinus) oceanops and Gobiosoma (Elacatinus)
randalli. The end result is a goby that looks extremely
similar to its counterparts. The only notable difference is
the stripes, which are now a combination of blue and gold,
and in some cases a greenish blue. This goby represents the
first hybridization of marine fish outside of the clownfish.
Other "cleaners" exist, though
they are not regularly found in the aquarium trade. Should
species such as Gobiosoma (Elacatinus) genie
or Gobiosoma (Elacatinus) evelynae become
available, you can be sure their care is similar to other
cleaner gobies. If in doubt that your new Gobiosoma
sp. is a "cleaner," look for the horizontal stripe.
A horizontal stripe running from head to tail is a sure sign
of a "cleaner." It should be noted that this pertains
only to the genus Gobiosoma.
Some interesting "non-cleaners"
exist as well. Recently, Gobiosoma (Tigrigobius)
puncticulatum, or more commonly called the Redhead
Goby, has been regularly available. It is frequently, though
incorrectly, called Elacatinus puncticulatum. Like
all "non-cleaners," the Redhead Goby does best in
small aquariums with very peaceful tank mates. They will be
harassed by any aggressive fish, and may even have trouble
getting food with peaceful fish that are fast eaters. In the
home aquarium the Redhead Goby will spend the majority of
its time perched within inches outside of it's preferred cave
or crevice.
|
A female Gobiosoma
(Tigrigobius) puncticulatum in the author's aquarium.
Note the abdomen swollen with eggs. Photo by Henry C.
Schultz.
|
Gobiosoma (Tigrigobius) multifasciatum,
or the Greenbanded Goby, is another adorable "non-cleaner."
In the wild, the Greenbanded Goby partakes in its own version
of a symbiotic relationship, known as "Commensalism."
The goby lives underneath black sea urchins just underneath
the water surface where it receives protection from predators
(DeLoach, 1999). In the home aquarium, without the presence
of urchins, they will spend a majority of their time on the
sandbed. The security of a small crevice is never far away.
|
(Top) A typical
looking specimen, from the author's tank, of Gobiosoma
(Tigrigobius) multifaciatum. (Bottom) The
male multifactiatum displaying his mating ritual.
Note the flared gills, deeper coloration on the opercle,
and erected dorsal fin. This is always accompanied with
his dance, which includes sets of short, erratic vibrations
or quivering. Photos by Henry C. Schultz.
|
|
The Greenbanded
Goby shows off its modified suctions cups by clinging
to the glass. Photo by Henry C. Schultz.
|
In Conclusion
Gobiosoma sp. can make great additions
to many styles of marine aquariums. The "cleaners"
can do well with most marine aquariums, while their "non-cleaning"
cousins are excellent fish for the small, or even nano-reef,
aquarium. Hobbyists are encouraged to demand captive-bred
Gobiosoma sp. from their retailers.
I would like to extend special thanks to
James L. Van Tassell and Todd Gardner for their assistance
on the current state of the classification in Gobiosoma.
|