Holthuisana transversa (von Martens), a freshwater/land crab from arid areas of Australia, is an efficient bimodal breather. In water, resting MO2 (1-65^molg"^") and Vw ( lS^mlg" 1 h") at 25°C were lower than in other aquatic crabs whilst percentage extraction of oxygen was quite high (47 %). MO2 was not regulated at low ambient PQ2 but could be increased at least three times during exercise. N...

The adult species of freshwater crabs (Berytephusa Cuniclaris) were collected from the Northern region Maharashtra, India, and isolated, refrigerated in laboratory. living euthanized at -30°C by thermal shock for 15 minutes. then clearly dissented tissue was extracted crab’s abdomen, crude extract obtained their tissue. completely dried off microwave pulverized a cold maceration process used im...

A novel disease of crayfish Procambarus clarkii appeared in the summer of 2004 in freshwater aquaculture in Jiangsu province of China. Light and transmission electron microscopy (TEM), molecular biological methods and in vitro culture were used to identify the pathogen. The agent was unique in having a helical morphology and rotary motility as observed by phase-contrast light microscopy and was...

The freshwater crabs of the Neotropics comprise 311 species in two families (Pseudothelphusidae and Trichodactylidae) and one or both of these families are found in all of the countries in the Neotropical region (except for Chile and some of the Caribbean islands). Colombia (102 species, 81% endemic) and Mexico (67 species, 95% endemic) are the biodiversity hotspots of freshwater crab species r...