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Geomorphometric analysis indicates overlap in body shape between sexes of black sea bass (Centropristis striata)
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2016
[PDF-1.30 MB]
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Description:"As a protogynous hermaphrodite, black sea bass begins life as female but may switch to male either pre- or post- maturity (Lavenda 1949). In the male stage the phenotypic characteristics may differ if an individual takes on a role as a dominant male. Dominant males display aggressive behavior during spawning season and either control a group of females (a harem) or control a territory while fending off other males (a lek). The secondary sexual characteristics in black sea bass are dimorphic, with dominant males generally larger than females. Dominant males develop a nuchal hump, a prominent fat deposit on their nape that becomes iridescent blue during mating season, as well as white highlights on their fins and face. In contrast, other, perhaps secondary males, look very similar to females that lack the nuchal hump and bright coloration. Determining the sex of fishes is generally accomplished through internal examination of gonad tissue, unless there are definitive external characteristics unique to each sex (e.g., the blue nuchal hump in black sea bass). In this study, we analyzed the shape of males and females to quantitatively evaluate differences between sexes. By using shape analysis, sexes were compared to determine the reliability of sex determination from external features"--Introduction. [doi:10.7289/V50Z71B9 (http://doi.org/10.7289/V50Z71B9)]
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Content Notes:by Bradley Keigwin, Gary R Shepherd, and Mark J Wuenschel.
"August 2016."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (pages 8-9).
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Rights Information:Public Domain
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