CAN KERWAN RESERVOIR BE CONSIDERED AS A POTENTIAL SITE FOR CONSERVATION OF THREATENED FISH? CASE STUDY OF ITS PHYTOPLANKTONS
Abstract
The present study comprises analyses of biological parameters of Kerwan reservoir . In fact, this parameter is complementary to other physico and chemical parameters when projected together to present an integrated image of the reservoir in regard to its suitability for propagation and multiplication of threatened fish fauna mahseer. The worldfamous game fish Mahseer are declining in their numbers and sizes in different parts of India, due to indiscriminate fishing of brood stock and juveniles, fast environmental degradation of aquatic ecosystems, construction of dams, barrages, weirs, etc. under various river valley projects.The methodology adopted to conduct above mentioned study is as follows. Monthly samples of water were collected from the four sampling stations of kerwan reservoir for a period of eighteen months. The parameters were analyzed according to the Standard Methods of Golterman et al. (1978), Boyd (1979), NEERI (1986) and APHA (1995). During the period of study it was observed that the minimum number of chlorophyceae species recorded were 23 and maximum was 37 . Minimum number of species of bacillariophyceae was 10 maximum was 15 . Number of species of cyanophyceae recorded was 6, and was minimum and 9 species were recorded , which was maximum.Number of species of euglenophyceae ranged between 1 which was minimum and 3, which was maximum. The quantitative analysis reveals that the range of phytoplankton remained between 800 organisms/ltr. to 3050 organisms/ltr. As discussed by Welch (1952) lakes with high plankton abundance are known as eutrophic. The values of phytoplankton in Kerwan reservoir also indicate its eutrophic state, though to a lesser degree. Thus,it could be inferred by the observations and as it has been stated by several investigators the mahseer species has shown adaptability from riverine to lacustrine condition it can be concluded that this fish can be well protected in Kerwan reservoir if managed scientifically.References
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