Mitotic and meiotic activities of germ cells during early development in the medaka, Oryzias latipes, are dealt with in this report. Primordial germ cells were obviously distinguishable from somatic cells 3 days after fertilization and began to proliferate about 7 days after fertilization. The mean number of primordial germ cells increased during a period of 7-10 days after fertilization, reach...

The transfer of maternal contaminants to offspring during oogenesis and gestation is documented in many animals, and in mammals, contaminants may pass from mother to offspring during lactation. Although other non-mammalian vertebrates provide parental care in the form of nutritive secretions for offspring to feed from, the potential for toxicant transfer during non-mammalian parental care is ra...

Meeting the growing energy demand for sustainability and environmental friendly fuels is a continuous process. Several oxygenated were tried tested according to availability depending upon geographical locations find solution against rapidly depleting fossil (gasoline diesel). In present investigation, viability of waste fry cooking oil converted into biodiesel fuel its various physiocochemical...

Behavioural assays were conducted on newly emerged steelhead Oncorhynchus mykiss to investigate the presence of behavioural syndromes and to determine whether behavioural type in young fish predicts growth rate in a conventional hatchery rearing environment. Individual fry were consistent in their position choice and activity behaviours across safe and unsafe contexts, as well as among assays c...

A rapid diagnostic method for fry mortality syndrome is described. The method is based on immunofluorescence analysis of spleen imprints from diseased rainbow trout fry and utilizes rabbit antlserum prepared against Flexibacter psychrophilus. A low level of cross reactivity with Flexibacter columnans was observed but this can be avoided by absorbing the diagnostic antiserum with F columnans. Du...

A host of abiotic factors modify fish social behavior. However, few studies have characterized the effects of temperature on behavior. In this study, brown trout Salmo trutta fry were reared at 5 different temperatures (4°C, 6°C, 8°C, 10°C, and 12°C). In order to characterize group structure, 3 behavioral parameters were investigated: group social structure (based on inter-individual distances)...

The effect of dietary supplementation DL-alpha-tocopheryl acetate (a-TA) on growth performance, feed efficiency, survival, and salinity resistance Asian catfish (Clarias macrocephalus) fry was evaluated. A total 750 were divided into five treatments with three replicates fed experimental diets containing varying levels alpha-TA: 0, 100, 200, 300, 400 mg·kg-1 diet for 45 days. Results show that ...

The effect of rapeseed oil methyl ether (RME) on cladocerans (water flea Daphnia magna Straus) and fish embryos prolarvae (round goby Neogobius melanostomus (Pallas)) is investigated. It has been determined that, with the increase RME content in water, decrease survival rate, fecundity, abundance, biomass population observed, as well rate round fry linear weight growth fry. did not produce any ...