Water quality assessment and freshwater fish diversity of Bhadra river, Western Ghats, Karnataka was examined. River water was clear except at one station (BV Site) with rocky and sandy substrate. The mean water quality of study sites were as following, pH 6.98, air temperature 22.66 degrees C, water temperature 20.16 degrees C, dissolved oxygen 8.74 mg/l, total hardness 27 mg/l, alkalinity 48 mg/l (as CaCO(3)), conductivity 135.5 mhos/cm, COD (15.16 mg/l), and BOD (3.78 mg/l), respectively. Altogether, 56 species of fish representing 31 genera and 15 families were recorded. The Cyprinid family was dominant in the present study. Various diversity index packages have been used to assess the fish diversity. Fish diversity is also correlated with physicochemical variables.

The study was conducted to gather information on the fi sh consumption pattern among randomly selected households using a distinct questionnaire. The study revealed that much of the fi sh consuming communities prefer to consume fi sh regularly in their diet. Consumers commonly choice to consume fi shes like Catla, Common carp, Rohu among the freshwater fi sh and Sardine, Mackeral and Prawns among sea food. The observation indicated that most of the respondents consume fi sh found to be once in a week compare to daily user. Survey showed that the range of fi sh species preferred (cost/ price of fi sh) mainly focused on the house hold income.

The study area is located in between 12°54' to 14°39' North altitude and 74°21' East longitude. A survey was conducted for the period from 2014 to 2015. A total of 70 fi sh farmers from 50 Villages belonging to 7 Taluks (Shikaripura,

Objectives: To investigate the xenobiotic action of toilet cleaner 'Harpic' on gills and muscles of fresh water teleost common carp (Cyprinus carpio L.). Methods: The test organism, fingerlings of Common carp (weight: 4.5±1.3g), (length: 5.3±1.5cm) were collected form Bhadra Reservoir Project, India. Static bioassay tests were conducted in order to evaluate the acute toxicity of Harpic. In all treatments, ten fully acclimatized test organisms were held and the same was observed for experiment and placed in different concentrations of Harpic to determine LC 50 values after 24 hours. Behavioral responses and mortality of the fishes were recorded at the interval of 2 hours and the alternation of behavioral characteristics was recorded. Glucose was estimated by Anthrone method. Glycogen was estimated by Kemp's method and Protein content was estimated by Lowery's method. Findings: The glycogen muscle (0.015mg/g) and gills (0.06mg/g), and protein in muscles (0.482mg/g) and gills (0.749mg/g) levels were found to be depleted respectively in the tissues exposure to sub lethal concentration over the control. Whereas, the glucose level in the fish tissue showed an increase in muscle (0.168 mg/g) and in gills (0.108 mg/g) on pesticide exposure in comparison with the control. The depletion of glycogen level of gills (0.06mg/g) on pesticide exposure may be due to stress condition and increased metabolism. Further depletion of protein may also attribute to spontaneous utilization of amino acids in various catabolic reactions inside the organisms in order to combat the stress condition. Gill exhibited alteration such as showed desquamation of the epithelial lining, necrosis (Telangiectasia) of the secondary lamellae, shrinkage of secondary lamellae and also showed hypertrophy and hyperplasia at the base of the secondary lamellae. In case of muscle the nuclear proliferation was observed and also seen different size of the muscle fibres, disintegration of muscle bundles, atrophy of muscle bundles, marked thickening and separation of muscle bundles. Novelty: No such works carried out on the effect on younger developmental stages of fishes which are considered to be more susceptible and vulnerable to toxicants than those of adult stages.

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