Population dynamics and metabolism of Aequipecten opercularis (L.) from the western English Channel (Roscoff, France)


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oheilmayer [ at ] awi-bremerhaven.de

Abstract

Population dynamics of the queen scallop, Aequipecten opercularis, were investigated in the western English Channel off Roscoff. Annual formation of natural growth rings on the shell surface was validated by stable isotope (d18O and d13C) analysis. A von Bertalanffy growth function (Ht = 58.9 mm ? (1e0.604? (t +0.235))) was fitted to size-at-age data of 249 individuals. Annual somatic and gonad production amounted to 19.74 kJ m-2 and 0.979 kJ m-2 y-1, respectively. Total mortality rate Z was estimated to be 1.716 y-1. Net growth efficiencies (ranging from 45% in 1-y-old to 11% in 6-y- old individuals) were in the same range as in other short-lived scallops, e.g. Mimachlamys varia. However, growth is consistently lower in this population than in other A. opercularis populations from similar latitudes, most likely owing to a more stressful environment.



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Eprint ID
8394
DOI 10.1016/j.seares.2003.07.005

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Heilmayer, O. , Brey, T. , Storch, D. , Mackensen, A. and Arntz, W. (2004): Population dynamics and metabolism of Aequipecten opercularis (L.) from the western English Channel (Roscoff, France) , Journal of sea research, 52 (1), pp. 33-44 . doi: 10.1016/j.seares.2003.07.005


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