<p><em>The research of the diversity and abundance of fish had been done at Tes Lake at the province of Bengkulu by using in-situ conservation. Observation and collecting of samples had been done in the mid of August to the mid of November 2002. Collecting of samples was done in 4 stations. There are 21 species of fish included 18 genera and 12 families which had been caught using gillnet (jaring insang), cast net (jala), fish pot (lukah/bubuh), fishline (pancing/tajur), and dip net (serok). Cyprinidae is the fish family which has most variety (8 species), while other families have only 2 and 1 species. The species of fish which had been caught were mostly river fish (freshwater fish). Based on the index of diversity (H’), the diversity of fish is medium between 0.78 – 1.27 with the highest diversity index is at station I (1.27) and the lowest is at station IV (0.78). The spread of fish based on uniformity index (E) is about 0.33 – 0.49 with the highest uniformity index is at station III (0.49) and the lowest is at station IV (0.33). The total abundance of fish which are collected during the research is 13,030 with the highest abundance is at station IV (4,643 fish) and the lowest is at station III (1,171 fish). Species of fish that are abundance and predominant are Puntius binotatus (C.V.) and Osteochilus hasseltii (C.V.) compared with others. The value of CPUE is 2.75 kg/trip with the highest value of CPUE is at station IV (4.6 kg/trip) and the lowest are at station II and III (1.7 kg/trip). The water quality of Tes Lake is still able to fishes living and fishery. The kinds of fish which are really valuable economically but it’s extinction being threatened are Anguilla marmorata Benn. and Tor douronensis (C.V.)</em>.</p>
