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Production at the Individual Level

Models of individual growth commonly used in fisheries and ecological research can be built around simple allometric functions representing the build-up of body mass (anabolism) and metabolic loss terms incorporating the effects of respiration, egestion, and excretion. From a bioenergetic perspective, body weight is a natural choice for the response variable in these models because it can be readily recast in terms of energy. Temperature affects virtually every dimension of the biology and ecology of aquatic organisms. Modifications of traditional models of individual growth can be augmented to account for temperature effects. The development of ‘full’ bioenergetic models considering each of the individual elements of production is a natural culmination of the issues described above. By invoking mass-balance constraints the bioenergetic approach offers important avenues for estimating elements of production that can be difficult to otherwise obtain.