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Describing body shape within and between sexes and populations of the Mottled spinefoot fish, Siganus fuscescens (Houttuyn, 1782) collected from different bays in Mindanao Island, Philippines

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Author(s): Zarine M. Hermita | Jessie G. Gorospe | Mark Anthony J. Torres | Gil J. Lumasag | Cesar G. Demayo

Journal: Aquaculture, Aquarium, Conservation & Legislation
ISSN 1844-8143

Volume: 6;
Issue: 3;
Start page: 222;
Date: 2013;
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Keywords: Mottled spinefoot | Siganus fuscescens | sexual dimorphism | body shapes | sexes

ABSTRACT
The study was conducted to determine sexual dimorphism in body shapes of S. fuscescens infive selected bays in Mindanao Island, Philippines. Likewise, shape and size relationship was assessedwithin species and between populations of the fish. The method of landmark-based geometricmorphometrics was used to describe the body shapes and size of the fish. Twenty-five landmark pointswere digitized from images of 194 individuals and relative warp analysis was done. Thin-plate spline andManova/CVA were used in presenting shape variations, where in this study body shape characteristics ofthe fish from different populations were observed. Discriminant function analysis and Hotelling’s testshowever showed no sexual dimorphism in body shape for all the populations. Shape variations wereobserved to be size-dependent. Both sexes of S. fuscescens were different from all other populations forhaving small sizes.

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