Oceanography pp 193-204 | Cite as

Fisheries and Productivity Studies

  • Peter A. Larkin
Conference paper

Abstract

The major features of oceanic ecosystems have now been delineated. We know a great deal about the workings of the physical factors that combine with the complexity of the shape of the oceans to determine a nonuniform distribution of flows of nutrients and mixing conditions that in turn determine rates of production of organic material. The dependent production at secondary and tertiary trophic levels is accordingly complex, both spatially and temporally, and is characterized by variability that is only crudely predictable now. Reflecting these circumstances, many species of fish show wide fluctuations in year class abundance. In fish communities as a whole there are complex interrelations as to who eats whom among species. Fisheries harvest a selective crop from these ecosystems, the impact of the harvest being evidently substantial. The need for a theory of multispecies harvesting is central to the future of fisheries management.

Keywords

Phosphorus Phytoplankton Photosynthesis Fishing Sonar 

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Copyright information

© Springer-Verlag New York Inc. 1983

Authors and Affiliations

  • Peter A. Larkin

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