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Seasonal changes in movements, abundance, size composition and diversity of the fish fauna of the Severn Estuary
Claridge, P.N.; Potter, I.C.; Hardisty, M.W. (1986). Seasonal changes in movements, abundance, size composition and diversity of the fish fauna of the Severn Estuary. J. Mar. Biol. Ass. U.K. 66(1): 229-258
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keywords
    Abundance; Local movements; Population dynamics; Size distribution; Species diversity; Pisces [WoRMS]; ANE, British Isles, Bristol Channel [Marine Regions]; Marine

Authors  Top 
  • Claridge, P.N.
  • Potter, I.C.
  • Hardisty, M.W.

Abstract
    Extensive sampling of the intake screens of power stations in the Severn Estuary (Berkeley, Oldbury-upon-Severn and Uskmouth) and Bristol Channel (Hinkley Point) yielded a total of 97 species of lampreys, elasmobranchs and teleosts. The Gadidae was the most abundant family at Oldbury, both in terms of numbers of individuals (51934) and species (13). The 15 most abundant species at Oldbury included 2 anadromous 1 catadromous, 1 estuarine and 1 freshwater species. The remaining 10 species, which fall within the broad category of estuarine-dependent marine species, contained a large proportion of 0 + indivuduals. The number of species, and to an even greater extent the total number of fish, underwent consistent seasonal trends, with maximum and minimum values for the latter occurring between September and January and between March and May respectively.

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