Journal
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
Volume 91, Issue 6, Pages 1273-1280Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0025315410000688
Keywords
sandeel; Ammodytes marinus; fecundity; stock reproductive potential; atresia; stock assessment
Categories
Funding
- The Danish Institute for Fisheries Research [98/025]
- Commission of the European Union [FP6-2003-SSP-3]
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The number of eggs produced by a parental stock is central to fisheries advice on recruitment potential. However, stock based estimates of egg production may give a misleading index of recruitment potential in stocks containing several reproductively isolated populations. This paper examines the ability of length, condition and oocyte developmental stage to predict levels of potential fecundity in the sandeel, Ammodytes marinus, in three important fished areas in the North Sea. Our results indicate that regional variation in this relationship exists, with fecundity in central areas of the North Sea being higher than those found just off the north-east UK. Oocyte diameter was also found to have a significant effect on potential fecundity, suggesting a down-regulation of oocyte numbers arising from pre-ovulatory atresia, however, this effect was not apparent in every model tested. Our findings have relevance to the local sustainability of spawning components and thus the regional management of the North Sea sanded stock.
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