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Hemibrycon sanjuanensis
Species of fish From Wikipedia, the free encyclopedia
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Hemibrycon sanjuanensis is a species of characin from the upper San Juan River, Colombia.[1]
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Etymology
It takes its name from the San Juan River, where specimens were collected.[1]
Description
Individuals range between 21.3–84.9 millimetres (0.84–3.34 in) in length. The body is slender and long, with a short, compressed face and flexible lips. In an example of sexual dimorphism, the rays of males' pelvic and anal fins are lined with small hooks.[1]
General coloration is a dark brownish-yellow, with a dark stripe running from directly behind the gills to the caudal peduncle. The ventral surface is light yellow. The dorsum and fins are patterned with melanophores. A reddish spot can be observed on the ventral part of the base of the caudal fin.[1]
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Range and habitat
H. sanjuanensis is believed to be endemic to the upper San Juan River in Colombia. Specimens were recovered from clear, fast-flowing streams with sandy or rocky bottoms.[1]
Diet
The species is insectivorous. Among other things, it has been known to eat water scavenger beetles, black flies, flesh flies, damselflies, predaceous diving beetles, caddisflies, nematodes, and isopods.[1]
References
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