Another complexity often ignored or simplified is interaction among species (e.g., competition or predation). Multispecies fishery models have been developed to incorporate predator-prey interactions. Such models require additional data to characterize interactions, a difficult undertaking even under laboratory conditions. Most attempts have surmised interactions from analysis ofstomach contents. Some scientists have advocated developing full ecosystem models, despite information needs that others consider unattainable. Like all mathematical models, fishery models make simplifying assumptions in an attempt to provide useful information.
See also: Age-Class Models; Age Structure and Population Dynamics; Allee Effects; Fecundity; Food Chains and Food Webs; Mortality; Prey-Predator Models.
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