Research was carried out to explore the fish species diversity and study some aspects of the Biology of fish of Daberam reservoir, Katsina state, for a period of three month from March to May 2009. 66 Samples of fish were collected from commercial fishermen and experimental fishing gears, preserved in formalin and taken to laboratory for identification. Seven genera comprising eleven species were identified. The regression coefficient (b) were 3.07, 2.91 and 3.21 for the three most commercially importance species in the reservoir i.e. Oreochromis niloticus, Tilapia zilli and Clarias gariepinus respectively, the results indicated Positive allometric growth for O. niloticus and C. gariepinus and negative allometric growth for T. zilli. The mean condition factor (k) was 1.140, with values of 1.027, 1.660, and 0.732 for O. niloticus, T. zilli and C. gariepinus respectively. This result indicates that the fish are not leaving well compared to other freshwater fishes.

Aspects of the reproductive biology of the most economically important fish species in Sabke reservoir was investigated such as Fecundity for females, average egg diameter, Gonado Somatic Index (GSI), for a period of twelve month (from March 2009 to February 2010).Samples of fish were collected through both experimental gears and commercial catches from local fishermen fortnightly. Fecundity range of 222 -9642, and mean of

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