Sex Determination of the Ommastrephid Squid Illex illecebrosus Using Beak Morphometries

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Abstract
The beak morphometrics of the ommastrephid squid Illex illecebrosus were analyzed as possible criteria for determining sex composition of beak samples taken from predator stomachs. A multivariate analytical procedure was adopted to elucidate the course of discriminant analysis needed in this study. The discriminant functions presented here can be employed usefully in identifying the sex of an unknown individual from either the upper or lower beak morphometrics.Key words: squid, Illex, beak, morphometrics, multivariate, discriminant analysis, sex determination

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