Eutrophication and freshwater fisheries

Winfield, Ian J.. 2015 Eutrophication and freshwater fisheries. In: Craig, John F., (ed.) Freshwater fisheries ecology. Oxford, Wiley-Blackwell, 779-793.

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Eutrophication, defined as the addition of ‘excess’ nutrients to a water body, is a widespread environmental problem facing the world’s aquatic habitats. For freshwater fisheries, impacts depend on the nature of the receiving system, the degree of nutrient enrichment, and numerous abiotic and biotic interactions. Consequences for fisheries may initially be positive through increased fish production, but in most systems they quickly become negative through ecological mechanisms including deoxygenation, sedimentation and shifts in competitive relationships within the fish community. Abundant planktivorous fish populations can encourage eutrophication by depleting zooplankton populations and thus allowing phytoplankton to increase, while in some systems the feeding activities of benthivorous fish can release nutrients from the bottom sediments. The successful treatment of eutrophication, which in some cases can be aided by ‘biomanipulation’ of the fish community, brings with it new challenges for fisheries managers because fishing conditions and/or catches may change dramatically during such ‘re-oligotrophication’.

Item Type: Publication - Book Section
UKCEH and CEH Sections/Science Areas: Parr
ISBN: 9781118394427
ISSN: 0018-8158
Additional Keywords: Nutrients, enrichment, deoxygenation, sedimentation, competition, biomanipulation, oligotrophication, re-oligotrophication
NORA Subject Terms: Ecology and Environment
Date made live: 21 Oct 2015 14:20 +0 (UTC)

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