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By Albert Lucas, Jennifer J. Watson

This article applies bioenergetics to aquatic animals and explores its position in aquaculture and fisheries technological know-how. It seeks to supply a compact account of bioenergetics in aquaculture and make clear difficulties encountered within the parts of fisheries and

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Absolute value of the exergonic reaction must be greater than that of the endergonic reaction, so that the resultant of the two coupled reactions is exergonic. To this thermodynamic condition (exergonic resultant) must be added a biochemical condition, because such coupling poses the problem of the simultaneous presence of two compounds in the same place in the cell. 1). 8 illustrates this process. To illustrate this phenomenon, Audigié and Zonszain (1988) give the following example, where Pm denotes molecular phosphorus.

Not only NH3, which is very toxic, when they are catabolized, but also derived products (urea, uric acid) which are toxic to lesser degrees: all these products must therefore be eliminated from the organism and are the constituents of urine represented by U. In this way, the metabolizable part of Ab is A=Ab-U. The process of formation of urine and its elimination constitutes the basis of nitrogenous excretion. In aquatic animals, ammonia, rapidly eliminated in the fluid environment, is the predominant means of excretion: these animals are ammoniotelic.

This example demonstrates in a spectacular way the power of enzymatic catalysis. 6 explains the mechanism of decrease in activation energy. Regulation of enzymatic catalysis Enzymatic regulation is one of the fundamental mechanisms of the homeostatic regulation of the internal environment, a concept put forward at the end of the 19th century by Claude Bernard (Rodwell, 1989). Two main types of mechanism are put into play to regulate enzymatic catalysis, either modification of the concentration of enzyme or modification of the catalytic efficiency of the enzyme.

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