The European lobster, Hommarus gammarus, is a commercially important species in Europe. Despite successful stock enhancement programs during the last two decades, culture methods of H. gammarus are still progress. In this study, effects pseudo-green water technique and clear with lower stocking densities on growth survival larvae stages I-IV were investigated. All reared 800 L cylindro-conical ...

The successful establishment of European lobster (Homarus gammarus) land-based production is hampered by the high mortality rate during larval development, which can be partially explained proliferation pathogens in communal tanks commonly used for rearing. Therefore, disinfection water treatment could improve low survival rates frequently recorded H. gammarus farming. In this study, we evaluat...

We explored how functional diversity among predators of the freshwater snail Physa creates an adaptive trade-off for the snail’s shell morphology. Physid shells range continuously between elongate and rotund in overall shape. The protection conferred by alternative shell shapes depends on the mode of attack employed by predators. Predators attack Physa primarily through shell entry (by crayfish...

Overall 10389 snails were collected from four study areas of Punjab from November 2005 to October2006. The highest prevalence (38%) was found for Indoplanorbis followed by Physa (17%), Bellamaya(10.3%), Gyraulus (10%), Lymnaea (9.2%), Oncomelania (9%) and the lowest was found for Bulinus (6.7%).Only Indoplanorbis snails were found to be positive for Schistosoma bovis cercaria. Correlation betwe...

A study by Porter (1976) showcases planktonic chlorophyta within the family of Sphaerocystis to be the best at surviving digestion by grazers due to presence of a complicated polysaccharide sheath found on the cells. This sparked interest in studying the survivorship of different algal groups after undergoing digestion by a two species of grazing snails (Physa sp. and Lymnaea sp.). Fecal sample...

T H E work of Morgan and his pupils has finally proved for the Dipteran Drosophila (i) that the factors of Mendelian heredity are contained in the chromosomes; (2) that they are disposed within the chromosomes in a constant and linear arrangement; (3) that a special mechanism exists for ensuring that factors within the same chromosome can become separated from each other—the mechanism of crossi...