The behavioural response of European seabass (Dicentrarchus labrax) to chlorinated seawater effluents

Seawater chlorination is widely used for coastal, marine industries for the prevention of fouling. Using a choice chamber system, we investigated the influence of chlorinated seawater at typical concentrations occurring near chlorinated cooling water discharges, on the behaviour of juvenile seabass...

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Veröffentlicht in:Marine pollution bulletin 2021-12, Vol.173 (Pt A), p.112995-112995, Article 112995
Hauptverfasser: Davis, Scott H., Maxwell, David L., Spence, Michael A., Muiruri, Evalyne W., Sheahan, Dave
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Sprache:eng
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Zusammenfassung:Seawater chlorination is widely used for coastal, marine industries for the prevention of fouling. Using a choice chamber system, we investigated the influence of chlorinated seawater at typical concentrations occurring near chlorinated cooling water discharges, on the behaviour of juvenile seabass (Dicentrachus labrax). These studies showed that there was evidence of an effect of chlorination, with models predicting 22% fewer fish present in the chlorine dosed chamber compared to the undosed chamber in all control runs (mean number of fish in the dosed chamber in all control runs was 2.23 in comparison to 1.74 when chlorine was present). These data suggest that when food is available D. labrax will enter areas that are at mean chlorination levels of 0.04 mg l−1, which are typical close to the discharge of power station cooling water but are more likely to move away once the food supply is reduced. •In N. Europe, juvenile D. labrax, are attracted to coastal power station effluent.•Low level chlorination is the most common chlorination strategy employed in UK.•Choice tank used to investigate the avoidance behaviour of seabass.•Evidence of an effect, predicting 22% fewer fish present in chlorinated water.•Evidence of avoidance, however its effect may be small compared to other factors.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2021.112995