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Trawls and cooling-water intakes as estuarine fish sampling tools: comparisons of catch composition, trends in relative abundance, and length selectivity
Greenwood, M.F.D. (2008). Trawls and cooling-water intakes as estuarine fish sampling tools: comparisons of catch composition, trends in relative abundance, and length selectivity. Est., Coast. and Shelf Sci. 76(1): 121-130
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer
Peer reviewed article  
Beschikbaar in  Auteur 
Trefwoorden
    ANE, British Isles, Scotland, Firth of Forth
    Cooling systems
    Fauna > Aquatic organisms > Aquatic animals > Fish
    Power stations
    Sampling
    Water > Cooling water
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    Clupea harengus Linnaeus, 1758 [WoRMS]; Sprattus sprattus (Linnaeus, 1758) [WoRMS]
    Firth of Forth [Marine Regions]
    Marien/Kust; Brak water
Auteur  Top 
  • Greenwood, M.F.D.
Abstract
    Fish populations in estuaries are often monitored with traditional sampling gears such as trawls. Trawling is relatively expensive and may be hindered by environmental conditions such as tides and substrates. Power station cooling-water intake screens have been effectively used as estuarine fish sampling devices for many years, but very few quantitative comparisons of intake fish-catch characteristics with samples from other collection methods have been made. Fish collected at the cooling-water intake of a large power station in the lower Forth estuary, UK, were more similar in assemblage composition to fish caught by nearby pelagic trawling than to fish caught by Agassiz (demersal) trawling, mostly because the intake and pelagic-trawl catches were largely composed of clupeids (Sprattus sprattus and Clupea harengus). The intake catch was typified by pelagic, demersal, and benthic species, however, and was less variable than the catches made by the two trawls. Monthly trends in relative abundance correlated reasonably well between the intake and trawl samples. Fish collected at the intake tended to be significantly smaller than those collected by trawling, which was probably attributable to the intake's smaller mesh size. The study highlighted the utility of a cooling-water intake as an efficient, low-cost fish sampling device, which should be considered as an alternative to trawling as the cost of the latter increases into the future.
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