Morphometric and meristic characteristics of Rohu and Nain as a measure of stock variability in different habitats
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Date
2019-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was undertaken to obtain a current database of the hydrological parameters and planktonic communities of the selected habitats (Baur reservoir, Haripura reservoir and stocking pond) and to study their impact on the health of the candidate species (Labeo rohita and Cirrhinus mrigala) in order to develop effective strategies and appropriate management measures. Water samples were collected and plankton was filtered monthly from September 2018 to April 2019. Various physicochemical parameters of water such as temperature, TDS, pH and DO were analysed. The values of K for L. rohita were observed to be 1.34 (Baur), 1.21(Haripura) and 1.31 (pond). On the other hand, for C.
mrigala, the values were 1.19 (Baur), 1.14 (Haripura) and 1.05 (pond) revealing better fish growth in Baur as compared to other habitats. Furthermore, the specimens of L. rohita selected from Baur reservoir manifested positive allometric growth (b=3.17) while those from Haripura (b= 2.85) and pond (b= 2.42) showed negative allometric growth. C. mrigala specimens showed positive allometric growth for all the
three habitats with b= 3.83 (Baur), b= 3.46 (Haripura) and b= 3.12 (pond).A relation between the morphometric lengths and TL was established and it was noted that in Baur and Haripura reservoirs, two morphometric characters were environmentally controlled for both the species
suggesting that presently the habitats are less affected by environment. In Haripura, intermediate characters were more i.e. ten for Rohu and nine for Nain, evincing that if proper management techniques are not implemented in the future, they would be converted into nvironmentally controlled characters and the habitat may get further degraded. This study concluded that Baur has a better hydrological regime and is less environmentally degraded, providing favourable environmental conditions from fisheries point of view. Thus, the need for the scientific management and development of the reservoirs has been taken into consideration not only to harness the optimal benefits of the system but also to maintain the ecosystem that they represent. The ecological monitoring of these reservoirs is very significant in the sustainable use and protection of water resources in the country. Herein, lies the relevance of the conducted study.
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