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Abstract
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Article Information:
Study of the Length–Weight Relationship and Condition Factor of Five Fish Species from Nkoro River, Niger Delta, Nigeria
J.F.N. Abowei, O.A. Davies and A.A. Eli
Corresponding Author: Davies Onome
Submitted: 2009 July, 01
Accepted: 2009 July, 28
Published: |
Abstract:
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The length-weight relationship and condition factor of five fish species from Nkoro River in the
Niger delta region of Nigeria was studied for twelve months using data obtained from fishers. The fishers used
a wide range of fishing gear such as hook and line, long line, cast nets, gill nets and traps. Fish specimen
randomly and identified using keys and descriptions. Specimens were stored in coolers containing ice and
transported to the laboratory for further analysis. Total length and weight were measured using standard
methods. The mean lengths and weights of the classes were used for data analysis, the format accepted by
FISAT. The degree of association between the length and weight was computed from linear regression
analysis. The respective exponential equation for the length weight relationship are: Ethmalosa fimbrata (Wt
= 0.0162 (TL)3.199); Ilishia africana (Wt = 0.5998(TL)2.719) Sardinella maderensis (Wt = 0.0478(TL)3.580) and
Cynoglossus senegalensis (Wt = 0.0326(TL)3.508). All species studied exhibited isom etric growth (b≈3) except
S. maderensis and C. senegalensis with b≈3.6 and 3.5 respectively that exhibited positive allometric growth.
The condition factor ranged from 0.917(I. africana) to 0.985 (C. senegalensis). There was difference in the
condition factors for the combined fish species and the monthly factor for each fish species studied: E. fimbrata
(0.85±0.015), I. africana (0.96±0.061), S. maderensis (0.87±0.072) and E. senegalensis (0.62±0.011), while
C. senegalensis was 1.10±0.042. All species studied were in good condition (k ≤ 0.5).
Key words: Fresh water fish, species, length, weight, condition factor, Niger Delta,
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Cite this Reference:
J.F.N. Abowei, O.A. Davies and A.A. Eli, . Study of the Length–Weight Relationship and Condition Factor of Five Fish Species from Nkoro River, Niger Delta, Nigeria. Current Research Journal of Biological Sciences, (3): Page No: 94-98.
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ISSN (Online): 2041-0778
ISSN (Print): 2041-076X |
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