The species of family Drosophilidae is a well known and documented experimental organism in almost in every field of biological science. Revolving around the study of geographical distribution and species diversity of this family, seven districts of North Chotanagpur were surveyed which revealed the occurrence of a total 2909 flies. Taxonomically, the collected species belong to four different genera and twenty species. Moreover, the species are more abundant and diversified in Hazaribag showing negative correlation with the temperature (r = -0.824) and positive correlation with the altitude (r = 0.94). The least abundance was shown in Dhanbad. The result of biodiversity indices indicates the species diversity in the order of HZ> KO> GR> BK> DN> CH> RM.

In this study, genotoxic and cytotoxic effects of Bendiocarb were evaluated in the bone marrow of Calotes versicolor, a reptilian model, using chromosomal aberration assay, micronucleus assay and mitotic index. Adult male garden lizards were acclimatized for one week in the laboratory and then injected intraperitoneally with a daily dose of 5.3 mg/kg body weight (1/3rd LD50) of Bendiocarb. Frequencies of CA in the form of gaps increased significantly (1,3 0.005) after 14th day of treatment. Breaks, deletions and additions were increased significantly (P 0.05) after 21st day. MN frequencies increased significantly (1:3 0.05) after 14th day. No significant change in frequencies of MI was observed till 14th day. However, after 21st day MI frequencies decreased significantly (0.05) in the treated group. This study thus, reveals that bendiocarb induces genotoxicity and cytotoxicity in a time dependent manner in the bone marrow cells of Calotes versicolor. The study also reveals the sensitivity of CA, MN and MI as significant bioassay for genotoxicity and cytotoxicity assessment.

It is a well known fact that blood parameters act as reliable indicators of fish health. In present studies, we have focused on hematological profile of different fish species. Haematological changes i.e. shape change of erythrocytes, thrombocytes and lymphocytes etc. are well known for their clinical value in prognosis and diagnosis. As hematopoiesis between fish and mammals is highly conserved, the fish can, thus, serve as an attractive model to study hematological changes in response to external environment stressors. Thus, the study of piscian haematological indices can not only be effectively used in fish health management but also in formulating mitigation measures against aquatic pollutants as well.

In the brain of pre-copulating female Spilostethus pandurus, Locus-3 has lateral neurosecretory cells which are observed in two groups, each of 2-4 cells arranged symmetrically on either side of locus-3. The axons of lateral neurosecretory cells (LNSC) form the lateral neurosecretory pathway and nervi corporis cardiaci externi (NCC II). The axons of LNSC run directly and do no decussate in the brain and come out independently through the ventral surface of protocerebrum as short paired NCC II. The NCC II of each side innervates the corpus cardiacum of its same side in the female Spilostethus pandurus.

In the present work an attempt has been made to study some aspects of bioenergetic modelling with special reference to the assessment of maintenance energy expenditure and energy value in growth materials in a teleostean fish, Channa gachua (Ham.). Over all maintenance energy expenditure in this fish ranged from 62.3% or 1522.5 Joules (J) in 16.3g fish to a value of 64% or 17094.4J (in 104.0g fish). The energy value utilized for growth/production (P) ranged from 37.7% or 917.5J (in 16.3g fish) to a value of 36.0% or 9615.6J (in 104.0g fish) of the total energy available in food (C). The details have been discussed in this paper.

Physico-chemical status of Kamla dhar of Katihar (Kosi zone) were investigated during March 2015 to April 2016. The result revealed well defined seasonal variation. Relatively high temperature, high value of dissolved oxygen and highest production range of alkalinity were observed which are favorable factors for the production of air breathing fishes. On the basis of present study, parameters the river water appears to be of moderate trophic level. On the whole river is getting pollute due to intense human activities and influence infusion of foreign materials from the surroundings. These materials mainly comprise of decomposable organic matters of plants and animals, terrestrial washing and effluents.