Fish Nutrition, Third Edition by John E. Halver

By John E. Halver

This 3rd version of Fish foodstuff is a entire treatise on nutrient specifications and metabolism in significant species of fish utilized in aquaculture or medical experiments. It covers foodstuff required and utilized in chilly water, hot water, clean water, and marine species for progress and copy. It additionally highlights uncomplicated body structure and biochemistry of the nutrition and functions of those ideas to clinical and functional nutrition formulations and to production innovations for significant species used around the world in aquaculture. *Nutrient requisites for nutritional formulations for fish farming*Digestive physiology*Comparative dietary standards of alternative species*Fish as distinctive animals for yes metabolic pathways

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Studies with rainbow trout have shown that the regression slopes between nitrogen intake and nitrogen excretion as well as the basal nitrogen excretion levels are affected by the DP/DE of the diet. 343 x NI (Kaushik, 1998). With regard to marine species, there is a relative lack of quantitative data on N excretion rates as affected by dietary DP/DE levels. , 2000). It can therefore be concluded that, in general, UE + ZE decreases as DP/DE decreases, at least within a certain range of DP/DE. This decrease in nonfecal N excretion and UE + ZE is due to the utilization of nonprotein energy sources for meeting energy requirements, resulting in a reduction in catabolism of a certain proportion of amino acid for energy purposes.

Data obtained for rainbow trout having different growth or protein deposition rates (M´edale and Guillaume, 1999) seem to indicate that there is a good correlation between protein retention and HiE. Many studies have shown highly significant linear (or largely linear) relationships between ME intake and RE as well as between digestible N (DN) intake and carcass N gain (RN). , 2000; Peres and Oliva-Teles, 2000). The slope is often identified as the “efficiency of metabolizable utilization for production,” K g or K pf .

These estimates should be used with caution. 1. , 1975; Hogendoorn et al. 1981). Most of these calorimeters allow measurements of oxygen consumption of fish under varying degrees of physical constraint. Some earlier investigations have been concerned with the energy cost of swimming by the fish and have largely ignored the level of feeding and the type of diet. Characteristically, these studies measured oxygen consumption by a fish swimming involuntarily either without food or after receiving a single meal, often from a poorly characterized diet.

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