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Blue-green algae and fish population changes in a eutrophic estuary

Potter, I.C., Loneragan, N.R., Lenanton, R.C.J. and Chrystal, P.J. (1983) Blue-green algae and fish population changes in a eutrophic estuary. Marine Pollution Bulletin, 14 (6). pp. 228-233.

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Evidence is presented which indicates that dense blooms of the blue-green alga Nodularia spumigena have affected fish and crab populations in a large estuarine system in south-western Australia. For example, the numbers of fish were generally very low at sites in which the chlorophyll a level, an excellent indicator of Nodularia density during the late spring and summer, was above 100 μgl−1. Moreover, commercial fishermen have recorded greatly reduced catches in Nodularia-affected areas and dead fish and crabs were found in regions where Nodularia was very dense. While the effects of this blue-green alga apparently led to death in the case of some bottom-living species in the most affected parts of the system, more active species moved into regions where Nodularia was virtually absent.

Item Type: Journal Article
Murdoch Affiliation: School of Environmental and Life Sciences
Publisher: Elsevier BV
Copyright: © 1983 Published by Elsevier Ltd.
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