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Length-weight relationships and growth pattern of a danionin fish species Chela cachius (Hamilton, 1822) of a perennial lake in Bangladesh

Publication Date - 2015-01-12 00:00:00

Publication Title : Length-weight relationships and growth pattern of a danionin fish species Chela cachius (Hamilton, 1822) of a perennial lake in Bangladesh

Publicationed By : Motia Gulshan Ara

Publication Publication Date : 2015-01-12 00:00:00

Publication Online Link : https://www.researchgate.net/publication/279852626_Length-weight_relationships_and_growth_pattern_of_a_danionin_fish_species_Chela_cachius_Hamilton_1822_of_a_perennial_lake_in_Bangladesh

Publication Description :

The present research established monthly relationships between standard length and body weight with the construction of generalized relationships of pooled data over a calendar year, and monthly growth pattern of neon hatchet fish Chela cachius (Hamilton, 1822) (Cyprinidae: Danioninae) collected from a perennial lake in Bangladesh. Twelve monthly samples totaling 1200 specimens were used to conduct this study. The standard length and body weight ranged from 25 to 64 mm and from 0.19 to 3.22 g respectively. The parameter values of a and b of the cubic equation describing the relationships between standard length and body weight in the form of W = aL b varied monthly. The highest a value was calculated in September (0.00015), the lowest was in February (0.00001). The b value ranged between 2.15 to 3.20, which highest in February and lowest in September. The coefficient of determination (r 2) ranged from 0.704 to 0.938. The results revealed that all length-weight relationships were highly correlated (r ≥ 0.839, P < 0.001). Confidence interval of b values at 95% confidence level revealed that growth pattern in February, June, October, November and December was isometric while growth pattern in other months was allometric. The generalized growth pattern of C. cachius population was isometric because the confidence limits of b value of the length-weight relationship at 95% of confidence level included 3 (2.98-3.11). The generalized length-weight relationships constructed for C. cachius was BW = 0.00001SL 3.05 in the perennial lake under the study.

 



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