Application of depletion methods to estimate stock size in the squid Loligo forbesi in Scottish waters (UK)

Iain Alexander Graham Young, Graham John Pierce, H. I. Daly, Maria Begona Santos Vazquez, Linda Napier Key, N. Bailey, Jean-Paul Robin, A. J. Bishop, Gabriele Stowasser, M Nyegaard, S Cho, M. Rasero, Joao Pereira

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Abstract

Abundance of the loliginid squid Loligo forbesi in Western and Northern Scottish (UK) waters (ICES fishery subdivisions lVa and VIa) 1989-1998 was estimated using "depletion" methods. Fishery catch and effort data for UK and French fishing vessels were obtained from official government statistics. Biological data were collected during monthly sampling visits to Kinlochbervie (Scotland, UK) fish market. Effects of using different indices for natural mortality and different model fits were evaluated. The results indicate initial (pre-fishing season) annual population sizes in the order of 10(6) animals. Significant between-year variation in the seasonal pattern of body weight and recruitment indicates that contemporaneous biological data, collected every month (or more frequently) are needed to underpin annual estimates. (C) 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)211-227
Number of pages16
JournalFisheries Research
Volume69
Issue number2
DOIs
Publication statusPublished - Sep 2004

Keywords

  • Loligo forbesi
  • stock assessment
  • depletion model
  • English-Channel
  • Northeast Atlantic
  • Falkland Islands
  • Cephalopoda
  • population
  • fishery
  • loliginidae
  • abundance
  • recruitment
  • migration

Cite this

Young, I. A. G., Pierce, G. J., Daly, H. I., Santos Vazquez, M. B., Key, L. N., Bailey, N., Robin, J-P., Bishop, A. J., Stowasser, G., Nyegaard, M., Cho, S., Rasero, M., & Pereira, J. (2004). Application of depletion methods to estimate stock size in the squid Loligo forbesi in Scottish waters (UK). Fisheries Research, 69(2), 211-227. https://doi.org/10.1016/j.fishres.2004.04.013