Biology and management of fish stocks in Bahir Dar Gulf, Lake Tana, Ethiopia
1998
Tesfaye Wudneh (Bureau of Agriculture, Amhara Regional Administration, Bahir Dar (Ethiopia))
The biology of the fish stocks of the major species in the Bahir Dar Gulf of Lake Tana, the largest lake in Ethiopia, has been studied based on data collected during August 1993. The distribution, reproduction patterns, growth and mortality dynamics and gillnet selectivity of these stocks are described. The major fish categories, Barbus spp., clarias gariepinus, and Oreochromis niloticus contribute equally to the catches. O. niloticus contribute equally to the catches. O. niloticus is most abundant in the shallow littoral zone, while C. gariepinus and the larger piscivorous Barbus species are found mainly in the deeper open water area of the lake. These larger species are mainly exploited by the motorised boat fisher. The catch from the reed boat fishery, confined to the littoral zone, consists mainly of O. niloticus and Barbus tsanensis. The breeding activity of all major species is associated with the rainy period and increase in lake water level.
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