Population Variation and Allometric Growth Patterns in Morphometric and Craniometric Traits of Cirrhinus mrigala Across Four Barrages in the Indus River Basin, Pakistan
Morphometric and Craniometric Traits of Cirrhinus mrigala
DOI:
https://doi.org/10.54393/mjz.v6i4.196Keywords:
Allometric Growth, Morphological Divergence, Fish Morphology, Growth PatternAbstract
Cirrhinus mrigala is a freshwater fish species of the Cyprinidae family, which is economically significant and inhabits rivers, lakes and reservoirs and has been reported in the Indus River mainly, of Pakistan. Objective: To examine both morphmetric and craniometric differences of populations in four locations: Trimmu Barrage, Taunsa Barrage, Chashma Barrage and Sukkur Barrage, of C. mrigala. Methods: In this observational cross-sectional study, a total of 60 samples were used and 34 morphometric and 7 craniometric characters were measured. Multivariate analysis revealed the presence of significant differences between the morphmetric and craniometric characters. Results: Fish in the Sukkur barrage were found to record the highest mean values of some of the morphometric and craniometric characters with intermediate values of the Chashma barrage and lowest values of Trimmu barrage. It is also important to note that there was moderate or weak correlation between total length and other morphetric characters, and negative allometric growth at Taunsa Barrage which could have been due to a number of factors in the environment. However, fish at Chashma Barrage showed a positive correlation which implies that fish have a good environment to grow. The craniometric characters of Chashma Barrage were a medium to poor correlation. Conclusion: These results emphasized the separation of morphology and allometric growth pattern of C. mrigala which would be of valuable relevance to taxonomists, aquaculture farmers and conservationists.
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