Río La Trampa, San José del Tule, 03.04.2019

The Río La Trampa is an eastern affluent of the Río El Terrero, which itself is an eastern affluent of the Río Coahuayana. This river on the slope of the Sierra Madre Occidental is isolated from the main river via a series of waterfalls. At San José del Tule is a nice little aquaeduct built that spans the river and exactly at this place a ford over this river with a width of maybe four meters can be found. At this ford which can be used by cars, a little cascade forms and water mixed with oxygen dashes into the river, which attracts many fish, so below this cascade lives an incredibly rich society of fish including three species of Goodeids, all three of them in the video. Specimens of Ilyodon whitei and Allodontichthys tamazulae can be spotted easily, whereas the very few cryptic Allodontichthys hubbsi will be seen only by very few people. Some people also might get confused with the - at first glance - similar looking, but in this video more common Gobiid species Sicydium multipunctatum (with bands over the back while Allodontichthys hubbsi shows white patches). Other species on the video are juveniles of the Leuciscid Algansea aphanea and the Poeciliid Poecilia nelsoni, a close relative of Poecilia butleri. The fish society is typical for the Coahuayana River and other species that can be found at this place are Astyanax mexicanus and the cichlid species Amphilophus istlanum as well as a second Gobiid species, Awaous transandeanus. The amount of foliage is not typical for the river but a result of the circulating current at this point and probably another factor that attracts so many fish. Close to the end of the video appears a representative of the shrimp genus Macrobrachium. Enjoy the beauty of Goodeids!