Length-Weight relationships and condition factor of <i>Citharinus citharus</i> and <i>Alestes baremoze</i> from Anambra river basin, Nigeria

Abstract

The length-weight relationships and conditions of Citharinus c tharus and Alestes baremoze from Anambra River were invest gated from September 2007-March 2008. Analys s of the size ranges of the two f shes showed that C. citharinus was heavier than A. baremoze but A. baremoze was long than C. citharus. Both fishes showed only one peak each in their size dis ribution indicating that they belonged to the same size or year c ass. There was highly significant relationship between the body weights and standard lengths of C. citharinus and A. baremoze (P < 0.001). The Kn va ues for the two fishes were fairly equal but the mean K. values showed that C c tharinus was more robust and in a better state of "well being" than A. baremoze. The results were discussed of similar studies, particularly the importance of the condition factor in the study of the biology of the f sh population.

Length-weight Relationships and Condition Factor of Parachanna Obscura Gunther 1861 in Epe Lagoon, Lagos, Nigeria

“…The variation in the 'b' value herein of the present study and from other studies could be attributed to food abundance, season, age, sex, fishing pressures, habitat, geographical location, sampling methods, sample size, environmental conditions as well as adaptive responses to the depth and size of the river system [34,35,36,27].…”

Length-Weight Relationship and Condition Factor of Four Commercial Fish Species of Oyan Lake, Nigeria

“…The values of R 2 ranged from 0.893to0.982 in B. nurse, O. niloticus, C. zillii and C. nigrodigitatus and all regressions were highly significant (P = 0.01). This was an indication that the body weight of the fish species could be estimated with a high degree of accuracy from known standard lengths [17,18].…”

“…From this study, C. zillii, B. nurse and O. niloticus were observed to have a negative allometric growth pattern with b value less than 3.0. Earlier researches reported that negative allometric growth pattern with b value less than 3.0 exist in C. zillii [8,3,15,16], in B. nurse [17] and in O. niloticus [8,16]. However, C. nigrodigitatus had a positive allometric growth pattern with b value greater than 3.0.…”

Length-Weight Relationship and Condition Factor of Chrysichthys longidorsalis (Risch & Thys Van Den Audenaerde, 1981) Landed at the Sanaga River Basin, Cameroon

“…The length-weight relationship can vary significantly even within the same species given that the length-weight relationship can be affected by many factors such as sex, seasonal variability, growth phases, stomach contents, food availability, gonadal development, sample size, habitat suitability, temperature and salinity of the environment, fishing activities, individual metabolism, age, maturity and health status of the fish [40,[45][46][47][48]. The correlation coefficient and coefficient of determination showed strong relationships between standard and total lengths of C. longidorsalis in the Sanaga River basin and indicated fitting regression equations for the standard length [49,43]. Also, the high coefficient of determination (R 2 = 0.9516) and correlation coefficient (>0.9) approximating to 1, revealed strong relationships between standard length (SL) and total weight (W) of C. longidorsalis from the Sanaga River basin of Cameroon.…”