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    Abstract
2009 (Vol. 1, Issue: 1)
Article Information:

Aspects of Sphyraena Barracuda (Wallbaum, 1992) Population Dynamics from the Fresh Water Reaches of Lower Nun River, Niger Delta, Nigeria

J.F.N. Abowei and O.A. Davies
Corresponding Author:  Davies Onome 

Key words:  Sphyraena barracuda, population dynamics, growth parameters, sustainable yield, exploitation rate, Nun River,
Vol. 1 , (1): Page No: 21-27
Submitted Accepted Published
Abstract:

Aspects of Sphyraena barracuda population dynamics from the fresh water reaches of the lower Nun River in Niger D elta, Nigeria was studied for one year, using five hundred specimens. The largest specimen measured 30.4 cm and weighed 249.3g at age 5+. 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 Lmax was 34.1 cm weighing 249.3g. The length attained at infinity (L4) 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 (To) 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 1.6yr!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.
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  Cite this Reference:
J.F.N. Abowei and O.A. Davies, 2009. Aspects of Sphyraena Barracuda (Wallbaum, 1992) Population Dynamics from the Fresh Water Reaches of Lower Nun River, Niger Delta, Nigeria.  Current Research Journal of Biological Sciences, 1(1): Page No: 21-27.
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ISSN (Online):  2041-0778
ISSN (Print):   2041-076X
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