Development and application of an objective method for classifying long-finned squid, Loligo pealei, into sexual maturity stages

Abstract

An objective method of classifying long-finned squid, £Oligo pealei, by their sexual maturity was developed using cluster and discriminant analysis techniques. The resulting system recognizes four developmental,stages and employs a maximum,of only five easily measured,morphometric,parame­ ters. Such a system is easy to use and is suitable for large-scale field studies with relatively untrained help. The value of determining,clearly recognized reproductive stages is demonstrated,by an appli­ cation of the method