Abstract
Morphometric variation study was carried out using truss analysis in freshwater murrel,Channa punctatus(Bloch, 1793), to explore different phenotypic stocks ofC. punctatus.Significant variation in the morphometric analysis was observed using the truss network and multivariate analysis of the three subpopulations of freshwater murrel,C. punctatus, from the two different regions of India. Principal component analysis accounted for a total variation of 91.95% by the first three principal components. PC 1 represented the variation due to size and PC 2 and PC 3 represented variations due to shape. The 95% confidence ellipses depicted the clear isolation between the samples in scatter graph of PC 1 on PC 2. The combined groups plot (DF 1 on DF 2) based on discriminant function analysis (DFA) also validated the existence of three different subpopulations. In group classification using DFA, 100 percent of all the samples were correctly classified into their original subpopulation. These results support the existence of multiracial composition ofC. punctatusacross the different geographical isolated sites and, thus, these findings indicate the presence of three different phenotypic stocks ofC. punctatus.
Highlights
Stock identification is considered to be an important aspect in the field of fishery management because the stocks with variable life history attributes such as growth and reproductive potentials are considered to be important to increase yield and for stock improvement programme of fish
The truss analysis is important because it covers the entire shape of the fish in a form of a uniform network, and the probability of extracting the morphometric differences among the different fish populations is increased
The principal component analysis resulted in extraction of 23 principal components
Summary
Stock identification is considered to be an important aspect in the field of fishery management because the stocks with variable life history attributes such as growth and reproductive potentials are considered to be important to increase yield and for stock improvement programme of fish. Development, and maturation in different members of the same species results in variety of body shapes [1]. Patterns of morphometric variation in fishes indicate differences in growth and maturation rates because the body forms are products of ontogeny. The truss network system was used by many notable workers to segregate the stocks [5,6,7]. The truss analysis is important because it covers the entire shape of the fish in a form of a uniform network, and the probability of extracting the morphometric differences among the different fish populations is increased. The present study was carried out to find out the morphometric variations employing truss network system using modern geometric morphometric methods to segregate the phenotypic stocks of C. punctatus collected from different isolated geographical sites
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