bulldog goodeid
Alloophorus robustus
Small freshwater fish, endemic to the Lerma River basin in Mexico, reaching 15.5 cm. It is caught commercially and sold for the aquarium trade.
Also called: goodeídeo-do-Lerma, chegua, bulldog goodeid
- maximum
- 16 cm
who is the bulldog goodeid
Fish of the family Goodeidae, freshwater and bottom-dwelling, endemic to Mexico: it occurs only in the Lerma River basin. It reaches 15.5 cm in length. It lives in freshwater, near the bottom, in a tropical climate, where the temperature is between 21 and 25 degrees. Like other goodeids, it is viviparous, meaning the young are born fully formed. It is caught commercially, and specimens also go to the aquarium trade. It is not a sport fish.
Essential profile. Identification, where it occurs and rules, with data from FishBase and the cited regulations. Season, time of day, technique and bait are added once we have a good source for the bulldog goodeid.
identification
Small bottom-dwelling fish, up to 15.5 cm. Like other goodeids, it is viviparous, and in males the front part of the anal fin is modified. Location is the best clue to recognizing the species: it only occurs in the Lerma River basin in Mexico, and does not exist in Brazil.
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Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
Essential profile: the index uses a general fish model (weather, sun, moon and tide), without a season or time of day specific to this species.
where found
Endemic to Mexico, where it occurs only in the Lerma River basin. Not recorded in Brazil.
Habitat: Freshwater, near the bottom, in the Lerma River basin.
rules for the bulldog goodeid
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency.
We found no species-specific rule beyond the region's general rules.
catch and release
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
Small, harmless fish. Handle it with a wet hand and return it quickly to the water. As it is endemic, do not release it in other basins.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00389, b = 3.12; FishBase (relação peso-comprimento bayesiana, estimativa)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
Essential profile: size, length-weight, depth, countries and conservation come from FishBase and the cited regulations, and the texts were written from those sources. Season, time of day, sensitivities, technique and baits and lures are not included yet, because we did not find a good source for this species.
- scientific FishBase: Alloophorus robustus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Alloophorus robustusNames by country and language.