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The water quality of rivers is an issue of serious concern today. Rivers are heavily impacted due to their use for carrying off the industrial, municipal, agricultural and domestic effluents. Water samples were collected for the present study from the Ganga River at Kanpur, Allahabad and Varanasi sites, during the period 2011-2012. The minimum temperature (17°C) was recorded in winter season. The pH, TDS, EC, sulphate, phosphate, nitrate, BOD and COD values exhibited their minimum at Allahabad site. The chloride and dissolved oxygen were recorded minimum at Kanpur site while alkalinity and total hardness had their lowest values at Varanasi site. The water quality of the Kanpur site was very poor compared to Varanasi and Allahabad sites. However, the Ganga river waters could host some tolerant fish species such as the exotic Cyprinus carpio and Oreochromis niloticus and also catfishes. All these species are very hardy, in respect of poor water quality, thus they (exotic species) have powerfully invaded in degraded systems worldwide.

Fish size is an integral component of river and stream system and represents an evident of structure, function, depth and health of the river/stream. Cirrhinus mrigala is a member of Indian major carp group. The species is of commercial significance due to its aquaculture potential and high consumer preference. Studies were undertaken during the period August 2011 to July 2012 from the Yamuna river at Allahabad, India. The size composition of C. mrigala varied from 16.8 to 94.3 cm total length. The mostly large size fishes were recorded in the monsoon season. The maximum exploitation was recorded in 46.1-52.0 cm size group with 16.72 per cent and minimum in 94.0-100 cm with 0.30 per cent in pooled samples. In the stock, female fishes were more exploited (48.66%) compared to male fishes (51.34%). The size composition and exploitation structure of C. mrigala indicated that very necessary to restoration or enhancement through stocking of this species in the Yamuna river, India. Presently, there is no local or regional arrangement for reporting restoration.Key words : Restoration, Size composition, Exploitation structure, Cirrhinus mrigala, Yamuna river How to cite this paper : Mayank, Priyanka and Dwivedi, Amitabh Chandra (2016). Linking Cirrhinus mrigala (Hamilton, 1822) size composition and exploitation structure to their restoration in the Yamuna river, India. Asian J. Bio. Sci., 11 (2) : 292-297