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The quality of water is very critical for fish survival and growth in a water body. However, little is known about the state of the Bhini Stream’s water quality and its relationship to fish catch. The focus of this study was to evaluate water quality parameters in the Bhini Stream and see if there was a correlation between them and fish catch per unit effort. Monthly samples were gathered using a three-level stratified sampling method. Temperature, depth, transparency, pH, TDS, EC, DO, alkalinity, hardness, chloride, sulphate, phosphate, nitrate, and fish catch (CPUE) were all monitored simultaneously in each of the three strata of the stream. The water quality characteristics were within the permissible range for fish production. There were no significant differences in water quality parameter concentrations between the riverine, transitional, and lacustrine zones (p>0.05). TDS and nitrates from fertilisers used on nearby fields and brought to the stream by runoff or floods were significantly and negatively correlated with CPUE (r=0.84, p<0.05; r=0.71, p<0.05). 13 fish species all belonging to order Cypriniformes were reported from the stream with Schistura denisoni being reported for the first time from the River Ravi.

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Crustaceans are distributed world-wide and are found in a variety of habitats. Freshwater crabs constitute one-fifth of the brachyurans all over the world. Freshwater crabs are the eminent indicators of good water quality. The present study was carried out with an aim to assess the influence of various physico-chemical parameters such as temperature, pH, depth, dissolved oxygen, free carbon dioxide, calcium, magnesium, bicarbonates and chlorides on the population of crabs in the Gho-Manhasan stream, a tributary of river Chenab. A comprehensive study of these parameters and a comparative analysis with those recorded in last eight years span gave a clear picture of the pollution stress due to anthropogenic activities in the water body that has led to a considerable decline in the population of crabs in this stream. This emphasizes the need to spotlight and improve measures of conservation before there is decline in the crab population to the levels from which they cannot recuperate.