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Morphometric Parameters of Parailia pellucida (Boulenger, 1901) from the Fresh Water Reaches of Lower Nun River, Niger Delta, Nigeria
並列摘要
Morphometric parameters of Parailia pellucida from the fresh Water reaches of lower Nun River in the Niger Delta area of Nigeria, was studied for a period of one year (Jan.-Dec. 2007), using five hundred specimens. The regression equation for the length weight relationship was Log W = 0.00001+3.23logL and correlation coefficient was 0.951 at p＜0.05. The regression equation for length breadth relationship was Log M = 1.50LogT(subscript L) and correlation coefficient was 0.994 at p＜0.05. The largest specimen measured 13.1 cm and weighed 99.6 g at age 3+. Growth increment in length (6.7 cm) was highest in 1-2 years; while grow th in weight was highest (74.1g yr^(-1)) in 2-3 years. The Maximum length at age attained L(subscript max) was 12.5 cm weighing 99.9 g. The length attained at infinity (L∞) was 13.2 cm. Growth exponent (b) was 3.23. Length performance index (θ^1) value was 2.73. Weight performance index value (Ø) was 1.87. Growth coefficient (K) value was 0.46. The hypothetical age at which length is zero (T(subscript o)) was -0.44; and the maximum age estimated was 3 years. There was no temporal variation in the condition of the fish through out the year with condition index value ranging from 0.91-1.00 and condition factor value of 0.96. Total mortality (Z) value was 1.4yr^(-1). Natural Mortality (M) value was 0.55; fishing mortality (F) value was 0.87. Value for the rate of exploitation was 0.67 with corresponding percentage value of 67%. Parailia pellucida populations from the fresh water reaches of the lower nun river was higher than the optimal value for sustainable yield, for the exploitation of the fishery; therefore stands the risk of over exploitation if urgent measures are not taken to effectively manage the fishery.
延伸閱讀
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- Abowei, J., & George, A. (2010). The Morphology, Abundance, Size and Sex Distribution of Callinectes amnicola (De Rochebrune, 1883) from Okpoka Creek, Niger Delta, Nigeria. Current Research Journal of Biological Sciences, 2(1), 27-34. https://www.airitilibrary.com/Article/Detail?DocID=20410778-201001-201009060066-201009060066-27-34
- Abowei, J. F. N. (2009). The Morphology, Abundance, Condition Factor and Length-weight Relationship of Ethmalosa fimbriata (Bowdish 1825) from Nkoro River Niger Delta, Nigeria. Advance Journal of Food Science and Technology, 1(1), 51-56. https://www.airitilibrary.com/Article/Detail?DocID=20424876-200912-201008160018-201008160018-51-56
- Abowei, J. F. N. (2009). Aspects of Hemisynodontis membranaceus (Greffroy-st Hilare, 1809) Population Dynamics from the Fresh Water Reaches of Lower Nun River, Niger Delta, Nigeria. Advance Journal of Food Science and Technology, 1(1), 27-34. https://www.airitilibrary.com/Article/Detail?DocID=20424876-200912-201008160018-201008160018-27-34