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Assessing and Managing Environmental Risks Associated with Marine Finfish Aquaculture

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Environmental Effects of Marine Finfish Aquaculture

Part of the book series: Handbook of Environmental Chemistry ((HEC5,volume 5M))

Abstract

Environmental Risk Analysis (ERA) consisting of risk assessment, management and communication can be applied to assess ecological and environmental changes associated with industrial-scale marine finfish aquaculture development. Physical, chemical, and biological variables are identified that may be used to detect thresholds for changes in ecosystem structure and function in order to apply ERA. Changes due to predictable or unpredictable effects may be local or far field. Predictable effects such as reduced dissolved oxygen, increased nutrients and organic matter, or lower diversity of benthic fauna in the vicinity of net-pens can be modeled to quantify local impacts on water column and sediment variables. Far-field and long-term risks such as interactions of escapees with natural stocks and effects of fishing to obtain food for cultured fish are more difficult to predict and quantify. Despite this, scoring methods using single or multiple indicators may be applied to determine the degree of risk associated with all identified potentially negative effects. ERA should be part of an integrated planning approach where aquaculture development occurs within a broad framework to include all development and user groups within the coastal zone. Environmental observations and models can then be combined with effective aquaculture husbandry practices to manage environmental risks from all sources.

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Authors and Affiliations

  1. Ecosystem Research Division, Fisheries and Oceans Canada, Bedford Institute of Oceanography, P.O. Box 1006, B2Y 4A2, Dartmouth, Canada

    Barry T. Hargrave & Paul D. Keizer

  2. Instituto Nacional de Investigação Agrária e das Pescas, IPIMAR, Departamento de Ambiente Aquático, Avenida de Brasília, 1449-006, Lisboa, Portugal

    William Silvert

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  1. Barry T. Hargrave
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  2. William Silvert
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  3. Paul D. Keizer
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Correspondence to Barry T. Hargrave .

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Barry T. Hargrave

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Hargrave, B.T., Silvert, W., Keizer, P.D. Assessing and Managing Environmental Risks Associated with Marine Finfish Aquaculture. In: Hargrave, B.T. (eds) Environmental Effects of Marine Finfish Aquaculture. Handbook of Environmental Chemistry, vol 5M. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b136021

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