Study of External Morphometric Variants and Length-Weight Relationship of Labeo rohita (Hamilton-1822) Fed with Varying Protein Levels
Study of External Morphometric Variants and Length-Weight Relationship of Labeo rohita (Hamilton-1822) Fed with Varying Protein Levels
Muhammad Javed Iqbal and Muhammad Naeem*
ABSTRACT
External morphometric studies along with Length-weight relationships (LWRs) were carried out for five groups of juvenile Labeo rohita fed with various protein: Energy ratios; fish meal (T0), 25%CP (Crude proteins) (T1), 30%CP (T2), 35%CP (T3) and 40%CP (T4). Experiment was designed to replace enriched fish meal diets with cheaper plant origin crude protein diets in fish culture. A total of 15 aquaria having 20 samples each were arranged in triplicate for 90 days to study the effect of five feeding groups on Length-weight relation and external morphometric variants of Labeo rohita. A total of 75 fish samples @ 5 fish samples per aquaria were analyzed in present study. T1 showed the highest values for mean wet weight 11.32±1.78, Total length 10.54±0.51, Fork length 8.94±0.46, Standard length 8.27±0.44, Body depth 2.64±0.16 and Body girth 5.28±0.33. Pectoral fin length, pelvic fin length, dorsal fin length and caudal fin length also showed highest values; 1.56±0.09, 1.36±0.09, 1.72±0.15 and 2.27±0.13 respectively in T1. Length-weight increment order in various treatment groups was T1>T2>T3>T4>T0. Highly significant correlations (p<0.01) were noted when log total length and log wet weight were plotted against each other and with log values of all external morphometric variants except condition factor (K). “b” (regression coefficient) value for LWRs of Labeo rohita in various groups was calculated as 3.37, 3.11, 3.20 in T1, T2 and T3 respectively and showed positive allometric growth pattern while negative allometric pattern was observed in T4 and T0. The coefficient of determination (r2) was ranged from 0.888 to 0.989 in LWRs, expressing highly significant correlation (p<0.01). The variance inflation factor (VIF) was observed as: 17.86 (T1), 12.50 (T2), 01.79 (T3), 10.75 (T4) and 10.20 (T0); expressing multi-collinearity among morphometric variants and LWRs with change in diet compositions. Diets with decreased fish meal percentage and maximum plant origin sources showed an increment in length-weight variants. Present findings indicate that fish dislike the fish meal diet and preferred the plant origin sources
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