In the present study, the effects of long term exposure (5 and 10 days) of 100 µg/lit 4-NP (nonyphenol) on the testis were investigated in African catfish Clarias gariepinus (Burchell, 1822). Histological examination of the testis of fish treated with 100 µg/lit 4-NP for 5 days showed the disintegration of cysts, separation of cells within the cysts, hypertrophy of sertoli cells and vaccuolation in testis. Histological examination of the testis of fish exposed to 100 µg/lit for 10 days showed alteration in structure of the primary spermatocytes. The structure of the spermatocytes changed from spherical to sickle shaped. Hypertrophy of sertoli cell, severe destruction of germ cells (spermatogonia), and vacuole formation was also seen. The study indicated that 4-nonylphenol had marked effects on the histology of testis of C. gariepinus. The severity of effects of fish increased with the time of exposure and it was noticed that there were marked structural changes in the testis exposed to 4-Nonylphenol for long term exposure.

Acute toxicity bioassay of three different heavy metals copper (Cu), lead (Pb) and cadmium (Cd) for the freshwater catfish, Clarias batrachus were conducted for evaluation of the toxicity. The 96h LC 50 values recorded for Cu, Pb and Cd were 15 ppm, 29 ppm and 35 ppm respectively. The results of this study indicate that the order of toxicity of these heavy metals is Cu>Pb>Cd in short duration acute toxicity experiments. The toxicity was found to be dependent on dose and duration of experiment for all these heavy metals. Cu was found to be much more toxic than Pb and Cd to C. batrachus.

Study on newly laid eggs of Japanese quail Coturnix coturnix japonica was undertaken for a period of 18 days on incubation in controlled laboratory conditions. The aim of the study was to evaluate the changes in egg weight, shell weight, yolk weight and embryo weight throughout the period of incubation. It had been found that as the embryo grows, the egg weight slowly goes down while embryo weight goes on increasing day by day. The study inferred that the shift or reduction in weight of egg is attributable to the progressive growth of embryo which utilizes its yolk contents for its growth. Apart from this, the shell weight also reduced from first day to last day in order to facilitate hatching of the embryo.

Environmental compounds belong to the endocrinedisrupting chemicals (EDCs) are a diverse group of the worldwide synthetic or natural substances defined according to its endocrine activity, adversity of effects, and a possible correlation cause-effects [1]. EDCs can be used in industry for the different applications such as lubricants and solvents (polychlorinated biphenyls, polybrominated diphenyl ethers and dioxins) [2-4], plastics (bisphenol A and S) [5,6], pesticides and herbicides (atrazine, cypermethrin, dichlorodiphenyltrichloroethane, dieldrin, methoxychlor, and vinclozolin) [4, 7], and organic compounds

The present paper reports the zooplankton diversity in Nal Damayanti (Simbhora) dam in Morshi Taluka of Amravati district, Maharastra State. Nal-Damayanti reservoir constructed on river Wardha, having   an area of 1335 hectares and 9729 hectares of total catchment area. The samples were collected during October-2007 to March-2008. The sample analysis showed great diversity in zooplankton consisting 39 species belonging to five groups. Rotifera were dominant by contributing 21 species followed by Cladocera 11 sps., Copepoda by 5 sps., Protozoa by 5 sps. and Ostracoda by 3 sps.