NDLI: Polychaetes as indicators of marine fish farm organic enrichment

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Polychaetes as indicators of marine fish farm organic enrichment

Content Provider	Springer Nature Link
Author	Tomassetti, P. Porrello, S.
Copyright Year	2005
Abstract	Marine fish farms cause environmental disturbance of sediment due to uneaten food and fish faeces that accumulate on the sea bottom. These products give rise to organic enrichment followed by degradation processes; reduction of level of dissolved oxygen in the bottom water; generation of high levels of sulfides; changes of benthic assemblages and even azoic conditions. The soft bottom benthic communities and, above all, the polychaetes are considered good indicators of environmental perturbations considering their relatively fast changes in diversity and abundance and because their trophic flexibility and life-history traits are considered a pre-adaptation to the condition of disturbed habitats. The aim of the present study is to evaluate the polychaete population changes as a result of organic enrichment produced by a marine fish farm. The study was carried out on a fish farm located in the coastal water of Porto Ercole (Tyrrhenian Sea) with two submersible sea cages and a year production of 180 tonnes. The macrobenthos samples were collected during four campaigns (July and December 2001, May and October 2002). The results showed: 1) a rapid change of the assemblage located beneath the cages related to the fish biomass reared and a high dominance of the opportunistic Capitella spp.; 2) limited sediment disturbance close to cages (20–50 m); 3) no effect in the area 50 m beyond the cages. Two months after the fish harvest and thus reduction of organic enrichment, perturbated assemblages showed signals of recovery like species richness increase and reduction of opportunistic species.
Starting Page	109
Ending Page	128
Page Count	20
File Format	PDF
ISSN	09676120
Journal	Aquaculture International
Volume Number	13
Issue Number	1-2
e-ISSN	1573143X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fish farm Marine sediment disturbance Organic enrichment Polychaetes assemblages Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Agronomy and Crop Science

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