SEXUAL DIMORPHISM AND ALLOMETRY OF EXTERNAL MORPHOLOGY IN OREOCHROMIS-MOSSAMBICUS

Publication Type:Journal Article
Year of Publication:1995
Authors:V. C. Almada, Oliveira R. F.
Journal:Journal of Fish Biology
Volume:46
Pagination:1055-1064
Accession Number:WOS:A1995RF15300013
Abstract:

Sexual dimorphism in growth of conventional morphometric characters was investigated in juveniles and young adults (size range: 31 to 91 mm) of Oreochromis mossambicus. A closely associated set of traits was identified that shows sexually dimorphic growth, which was positively allometric in the males. These traits correspond to two different morphological complexes: jaw structure and anal/dorsal fins. The best sex discriminators among this set of traits were premaxilla width, anal fin height and snout length. These findings may be explained in terms of intra- and inter-sexual selection acting together and favouring males with strong and large mouths and high dorsal and anal fins, traits that are important in agonistic displays (jaw and fins), righting and nest digging (jaw).

URL:<Go to ISI>://WOS:A1995RF15300013

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