Objective assessment of maturity in the Patagonian squid Loligo gahi (Cephalopoda: Loliginidae) from Falkland Islands waters

Hatfield, E. M. C.; Murray, A. W. A.. 1999 Objective assessment of maturity in the Patagonian squid Loligo gahi (Cephalopoda: Loliginidae) from Falkland Islands waters. ICES Journal of Marine Science, 56 (5). 746-756. 10.1006/jmsc.1999.0514

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Abstract/Summary

An objective assessment of maturity in the loliginid squid Loligo gahi was tested using a method developed for L. pealeii utilizing principal component and discriminant analyses. Samples were taken from both seasons of the commercial fishery in the Falkland Islands (prosecuted south of 51°20′S) in 1994 and 1995. In addition, research samples were taken in January, June, and November, outside the fishing seasons, to provide individuals of a greater range of size and maturity. The method, using a combination of indices of somatic and gonad lengths and scoring abundance of eggs and spermatophores in females and males, respectively, proved to be successful both in a research context, when variables can be measured to a high degree of precision, and in a fisheries context where less precision is practicable. The method also detected anomalies in the maturity status of squid that might have been overlooked in a more subjective assessment, corroborating the accumulating evidence for batch-spawning in loliginid squid. Four stages of maturity were recognized for female squid and three for male squid.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1006/jmsc.1999.0514
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	10543139
Additional Keywords:	reproduction, maturity scales, multivariate analysis, Loligo gahi, cephalopods
Date made live:	15 Oct 2013 10:25 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/503507

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