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Aspects of Sphyraena Barracuda (Wallbaum, 1992) Population Dynamics from the Fresh Water Reaches of Lower Nun River, Niger Delta, Nigeria
並列摘要
Aspects of Sphyraena barracuda population dynamics from the fresh water reaches of the lower Nun River in Niger Delta, Nigeria was studied for one year, using five hundred specimens. The largest specimen measured 30.4 cm and weighed 249.3g at age 5t Growth increment in length was highest in 1-2 years while growth in weight was highest in 2-3 years. The maximum length at age attained L(subscript max) was 34.1 cm weighing 249.3g. The length attained at infinity (L(subscript ∞)) was 40.4 cm. Growth exponent (b) was 2.84. Growth coefficient (K) value was 0.55. The hypothetical age at which length is zero (T(subscript o)) was -0.25 and the maximum age estimated was 5 years. There was no temporal variation in the condition of the fish throughout the year with condition index value ranging from 0.83- 1.00 and condition factor value of 0.94. Total mortality (Z) value was l.6yr^(-1). Natural Mortality (M) value was 0.79; fishing mortality (F) value was 0.81. Sphyraena barracuda populations from the fresh water reaches of the lower nun river was above the optimal value for sustainable yield for the exploitation of the fishery. This fish therefore stands the risk of over exploitation if urgent measures are not taken to develop the fishery.
延伸閱讀
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