Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 66, Issue 3, Pages 509-516Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsn216
Keywords
horse mackerel; macroscopic identification; maturity stage; microscopic identification; percentage error; Portuguese coast
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The consequences to fisheries management of erroneous macroscopic identification of maturity stages are evaluated. The percentage error in macroscopic identification of maturity stages of female horse mackerel (Trachurus trachurus) from the Portuguese coast was determined and analysed by maturity stage, between the periods January-June and July-December, between research surveys and commercial landings, and between per year and month and by length class, to assess its implications in determination of spawning season, maturity ogives, and spawning-stock biomass. The highest percentage errors in macroscopic identification were between late ripening and partly spent stages, in fish > 30 cm, and for all fish collected in 1998 and 2005. Late ripening was generally macroscopically underestimated, and the partly spent stage overestimated. The implications for the information provided to the ICES assessment working group are analysed.
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