Relative

Absract The relative efficiency and selectivity of monofilament and multifilament trammel nets in southern basin of Lake Kainji were studied. The netswere set and inspected daily for 30 consecutive fishing days. Monofilaments trammel nets had the highest relative species diversity index of 0.52 while multifilament had 0.48. A total of 204 fish were caught, 64.7% was caught by monofilament nets and multifilament net 35.3%. This suggests, that there was significant (P < 0.05) variation in catching efficiency of the trammel netswith regardto Citharinus citharus with the monofilament net having the highest 79 fishes, but was not significant (P > 0.05) in overall number of difference species caught. However, trammel nets showed better efficiency for catching C. citharus, S. membranaceous, C. laticeps, O. nitoticus, Sarotherodon, than other species caught. There is no significant difference (P > 0.05) in the minimum and maximum sizes of fish caught, and this indicates the efficiency of the trammel nets in avoidingjuveniles of commercial species, due to the mesh sizes used (3"and 5"). There are two main.types of gillnet and tangle nets: single wall nets and multi walled trammel nets. Trammel nets and one walled gillnets differ in their .construction.

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