Differential effects of cobalt ions in vitro on gill (Na, K)-ATPase kinetics in the Blue crab Callinectes danae (Decapoda, Brachyura).

We used the gill (Na, K)-ATPase as a molecular marker to provide a comprehensive kinetic analysis of the effects of Coin vitro on the modulation of K-phosphatase activity in the Blue crab Callinectes danae. Co can stimulate or inhibit K-phosphatase activity. With Mg, K-phosphatase activity is almost completely inhibited by Co.

Salinity-dependent modulation by protein kinases and the FXYD2 peptide of gill (Na, K)-ATPase activity in the freshwater shrimp Macrobrachium amazonicum (Decapoda, Palaemonidae).

The geographical distribution of aquatic crustaceans is determined by ambient factors like salinity that modulate their biochemistry, physiology, behavior, reproduction, development and growth. We investigated the effects of exogenous pig FXYD2 peptide and endogenous protein kinases A and C on gill (Na, K)-ATPase activity, and characterized enzyme kinetic properties in a freshwater population of Macrobrachium amazonicum in fresh water (<0.5 ‰ salinity) or acclimated to 21 ‰S.

Effects of ammonia on gill (Na, K)-ATPase kinetics in a hololimnetic population of the Amazon River shrimp Macrobrachium amazonicum.

Water quality is essential for successful aquaculture. For freshwater shrimp farming, ammonia concentrations can increase considerably, even when culture water is renewed frequently, consequently increasing the risk of ammonia intoxication. We investigated ammonia lethality (LC-96 h) in a hololimnetic population of the Amazon River shrimp Macrobrachium amazonicum from the Paraná/Paraguay River basin, including the effects of exposure to 4.