The Blackmouth Splitfin (*Girardinichthys viviparus*) is a small, freshwater fish native to central Mexico, recognized for its distinctive black markings around the mouth and its split, fan-shaped caudal fin. This species is endemic to the highland lakes and streams of the Valley of Mexico, particularly in the states of Mexico, Michoacán, and Morelos. Due to its limited range and habitat degradation, the Blackmouth Splitfin is not a major target of commercial fisheries; rather, it is occasionally collected by local communities for subsistence or as an ornamental species for aquariums. Mexico is the primary—and virtually sole—country associated with the harvest of this species, with no significant fishing industry elsewhere due to its restricted distribution and endangered status. Conservation efforts in Mexico focus on habitat restoration and captive breeding to prevent extinction, as wild populations have declined sharply due to pollution, water extraction, and competition from invasive species.
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Data from FAO. 2025. Global Capture Production. In: Fisheries and Aquaculture.