伊勢湾におけるマアナゴの動態モデルの開発

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タイトル別名
  • Behavioural Modelling of Conger Myriaster in Ise Bay
  • イセワン ニ オケル マアナゴ ノ ドウタイ モデル ノ カイハツ

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A behavioural model of Conger myriaster in Ise Bay is developed which considers the migration effect as well as the growth and the population change. The model is coupled with a hydrodynamic model and a lower-trophic ecosystem model which predict physical environment and water qualities of the target area. In the migration model, the direction of the fish movement is determined by the preference intensities for the environmental factors such as water temperature, dissolved oxygen, and so on. The fish growth is expressed by Von Bertalanffy's formula, parameters of which are tuned so that the formula represents the actual fish size variation. The population change is calculated by a general population dynamics model, in which the fishing mortality is estimated by the actual fish catch data. The model is validated by comparing the annual change of fish catches at major fishing ports. The results of the fish behaviour simulation showed that the areas with high resource density in the simulation corresponded to high CPUE areas in the real world. The relation of environmental factors and fish dynamics, and the situation of resource utilization are also discussed.

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