Original scientific paper
SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA
Oju Richard Ibor
Full text: croatian pdf 249 Kb
page 113-131
downloads: 655
cite
APA 6th Edition
Ibor, O.R. (2017). SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA. Croatian Journal of Fisheries, 75 (3), 113-131. Retrieved from https://hrcak.srce.hr/186843
MLA 8th Edition
Ibor, Oju Richard. "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA." Croatian Journal of Fisheries, vol. 75, no. 3, 2017, pp. 113-131. https://hrcak.srce.hr/186843. Accessed 7 Jan. 2025.
Chicago 17th Edition
Ibor, Oju Richard. "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA." Croatian Journal of Fisheries 75, no. 3 (2017): 113-131. https://hrcak.srce.hr/186843
Harvard
Ibor, O.R. (2017). 'SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA', Croatian Journal of Fisheries, 75(3), pp. 113-131. Available at: https://hrcak.srce.hr/186843 (Accessed 07 January 2025)
Vancouver
Ibor OR. SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA. Croatian Journal of Fisheries [Internet]. 2017 [cited 2025 January 07];75(3):113-131. Available from: https://hrcak.srce.hr/186843
IEEE
O.R. Ibor, "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA", Croatian Journal of Fisheries, vol.75, no. 3, pp. 113-131, 2017. [Online]. Available: https://hrcak.srce.hr/186843. [Accessed: 07 January 2025]
Full text: english pdf 249 Kb
page 113-131
downloads: 309
cite
APA 6th Edition
Ibor, O.R. (2017). SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA. Croatian Journal of Fisheries, 75 (3), 113-131. Retrieved from https://hrcak.srce.hr/186843
MLA 8th Edition
Ibor, Oju Richard. "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA." Croatian Journal of Fisheries, vol. 75, no. 3, 2017, pp. 113-131. https://hrcak.srce.hr/186843. Accessed 7 Jan. 2025.
Chicago 17th Edition
Ibor, Oju Richard. "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA." Croatian Journal of Fisheries 75, no. 3 (2017): 113-131. https://hrcak.srce.hr/186843
Harvard
Ibor, O.R. (2017). 'SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA', Croatian Journal of Fisheries, 75(3), pp. 113-131. Available at: https://hrcak.srce.hr/186843 (Accessed 07 January 2025)
Vancouver
Ibor OR. SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA. Croatian Journal of Fisheries [Internet]. 2017 [cited 2025 January 07];75(3):113-131. Available from: https://hrcak.srce.hr/186843
IEEE
O.R. Ibor, "SEXUAL DIMORPHISM IN BLACK JAW TILIAPIA (Sarotherodon melanotheron) AND BANDED JEWELFISH (Hemichromis fasciatus) FROM THE GREAT KWA RIVER, CALABAR, NIGERIA", Croatian Journal of Fisheries, vol.75, no. 3, pp. 113-131, 2017. [Online]. Available: https://hrcak.srce.hr/186843. [Accessed: 07 January 2025]
Abstract
In this study, the pattern and magnitude of sexual dimorphic differences
have been investigated in black jaw tilapia (Sarotherodon melanotheron)
(n = 160; 74 males and 86 females) and banded jewelfish (Hemichromis
fasciatus) (n = 120; 42 males and 78 females) from the Great Kwa River,
Calabar, Nigeria. Fish samples were collected between July and December
2015. Fourteen morphometric variables, including body weight, total
length, standard length, body depth, cheek depth, pre-orbital length, postorbital
length, pectoral fin length (right and left), pelvic fin length (right and
left), head length, gonad weight, eye diameter and four meristic variables,
including number of pectoral fins (right and left) and number of pelvic
fins (right and left), were taken using standard methods. Size-adjusted
morphometric measurements subjected to step-wise discriminant function
analysis were used to determine predictor variables to morphologically
differentiate sexes for both species; magnitude of dimorphism between
sexes was estimated using percentage classification accuracy of the
discriminant function analysis. From the discriminant function analysis, the
pectoral fin length and gonad weight positively contributed significantly
to morphometric dimorphism (magnitude=69.2%) in male and female S.
melanotheron suggesting adaptation for reproductive function; while for H.
fasciatus the body depth and standard length were important contributors
to sexual dimorphism (magnitude=84.2%) suggesting size dimorphism for
aggressiveness, territorial behavior and improving swimming performance.
Overall, our results indicate that the different magnitude of sexual
dimorphism between the two species could be attributable to the type and
functional role of sexual dimorphic traits.
Keywords
Morphometric measurement; Sexual dimorphism; Cichlids; Great Kwa River; Nigeria
Hrčak ID:
186843
URI
https://hrcak.srce.hr/186843
Publication date:
28.9.2017.
Article data in other languages:
croatian
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