Fish species diversity and ichthyomass in Pak Mun Reservoir, five years after impoundment

摘要

The fish species diversity and ichthyomass at Pak Mun Reservoir were appraised. Eight stations at the reservoir were sampled. The number of species and Shannon's diversity index ranged from 22 to 31 and 1.54 to 3.07, respectively. Common species wereTridentiger ocellatus, Tetrodon leiurus, Clupeichthys aesarnensis, Oxyeleotris marmorata, Hampala dispar, Barbodes gonionotus, Puntius stigmatosomus, Parambassis siamensis, Macrognathus semiocellatus and Cyclocheilichthys mekongensis. The similarity index revealed a high correlation between the adjacent stations but decreased as the distance increased. Seasonal changes have no effect on ichthyomass.