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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
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Abstract:
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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.
Key words: Sphyraena barracuda, population dynamics, growth parameters, sustainable yield, exploitation rate, Nun River,
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Cite this Reference:
J.F.N. Abowei and O.A. Davies, . 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): Page No: 21-27.
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ISSN (Online): 2041-0778
ISSN (Print): 2041-076X |
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