Goldbreat Goodeid (Ilyodon furcidens)
Family: Goodeidae, Subfamily Goodeinae
Common Name: Goldbreast Goodeid
Origin and Habitat: Pacific slope of Mexico: Ameca-Magdalena and Armeria-Coahuayana river basins. Inhabits fast-flowing streams and small rivers.
Compatibility/Temperament: Can be maintained in pairs or a groups of 5-6. Males will fight among themselves, though usually with no harm occurring. Compatible with most community fish that can tolerate the lower temperatures and stronger water flow, though many writers recommend a species tank as this fish does tend to be semi-aggressive; should not be kept with highly aggressive species.
Goldbreast Goodeid Diet
Will eat most prepared foods, which should include a quantity of vegetable foods and algae wafers. This fish consumes algae in its natural habitat.
Males attain close to 3 inches (7 cm), females are larger at 3.5 inches (9 cm).
Minimum Tank Suggestion
20 gallons for a pair, but preferably a 30-inch tank.
Water parameters for Goldbreast Goodeid
Medium hard (hardness 10-20 dGH), basic (pH 7-8), temperature 18-24C/64-75F.
The Goodeinae, also commonly called Splitfins, occur only in Mexico. They tend to be somewhat more aggressive than other livebearers, and have some unique characteristics when it comes to reproduction.
This fish is a prolific breeder, and adults do not predate the young so they are likely to survive. Males are slightly smaller, more colourful, and possess the notched anal fin called the andropodium through which sperm is released into the female. This is a more primitive form of what later became the separate gonopodium of other livebearer groups. Unlike most livebearers, females do not store sperm and must be inseminated for each brood; about 40 young can be produced every two months. Also unique to the Goodeids is the trophotaeniae which functions like a placenta in mammals, nourishing the fry as they develop inside the female; unlike the Poeciliids (platy, molly, etc) where the egg provides the nourishment for the developing embryo, in Goodeids the nourishment comes directly from the mother. At birth the fry can be quite large, up to 3/4 of an inch. This fish has a lifespan of 4 years, and develops a curvical hump with age.
This fish is a lively and strong swimmer throughout the tank. A good aquascape would be a long aquarium with a substrate of gravel with some smooth pebbles, and a current from the filter outflow at one end to replicate a stream flow. Some hardy plants such as Anubias and Java Fern could be attached to some of the pebbles or rock, particularly to provide territory divisions for the males, and these can also be provided by arrangement of rock and bogwood. Floating plants will keep the light subdued for this fish.
The species was initially described in 1882 by D.S. Jordan and C.H. Gilbert and named Characodon furcidens. In 1993, Espinosa Perez et.al. transferred it into the present genus Ilyodon that C.H. Eigenmann erected in 1907. Ilyodon comes from the Greek, ilyos (= cave) and odous (= teeth). The species epithet is Latin and refers to the forked teeth of this species.
Espinosa Perez, H., M.T. Gaspar Dillanes and P. Fuentes Mata (1993), Listados faunisticos de Mexico III, Los peces dulceacuicolas Mexicanos, Univ. Nacional Autonoma de Mexico, pp. 1-98.
The following members have contributed to this profile: tah1795, Byron
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