An intermediate set of fisheries ecosystem models are discussed in terms of the promise they offer for understanding fisheries sustainability. The models are intermediate in the sense that they treat a set of interacting agents that are small enough to allow progress with purely analytical
means (n < 5). The models include considerations of food web dynamics and population structure. Here the later is considered to include age and metabolic status, although genetics can also be included. As an example of structure, a nonlinear physiological model for starvation is presented.
The metabolically based model produces finite limits of populations in space based on the carrying capacity of the environment. A structured model of the lower part of a marine food web's response to climate fluctuations is discussed as a basis for understanding these influences on marine
ecosystem function. This is followed by an analysis of Alaskan pollock, and an assessment of the adaptive nature of cannibalism in that population. The conclusion is that this behavior only works with spatial/temporal segregation of subpopulations. The pollock example is followed by a general
discussion of movement in fisheries models and its consequences in terms of persistence in populations. This is followed by an example of explicitly including fisheries. An analysis of competition between long-line and purse seine fleets on age structured tuna is presented.
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