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Abstract

In this  study, we have studied the length-weight relationship, condition factor (Kr), gonado-somatic index (GSI) and size at first maturity of two Cichlidae species (Tilapia zillii and Hemichromis bimaculatus) from two lakes (Megarine and Temacine) of the northern Sahara (Algeria). Some 159 specimens of H. bimaculatus and 52 T. zillii were sampled between September 2012 and July 2013. The length-weight relationship revealed an isometric value b (3.0) for H. bimaculatus from Lake Megarine, while there was no significant difference for T. zillii from Lake Temacine. We noted a negative allometric growth pattern (b<3) of males and females of H. bimaculatus. Both sexes of T. zillii grew isometrically. The Kr did not differ significantly between months for the two studied species. It was less than 1 only in November and July for H. bimaculatus. For T. zillii, the monthly mean of Kr was always greater than 1 for all the studied period. The first sexual maturity of 50% of males was observed at 52.75mm in H. bimaculatus and 61mm in T. zillii. The smallest mature female had a total length of 60.26mm and 66mm for H. bimaculatus and T. zillii respectively. The reproduction period of H. bimaculatus and T. zillii begins in March with an extended spawning period. The overall sex ratio was in favor of females (1: 0.7) in H. bimaculatus, and in favor of males in T. zillii (1: 1.33). For both species, the sex ratio varied according to months and size classes.

Keywords

Length-weight Condition factor Reproduction Cichlidae.

Article Details

Author Biographies

Cherif GHAZI, Department of Ecology and Environment, Faculty of Nature and Life Sciences, University Batna, Batna, Algeria.

Assistant professor

Abdelkrim SI BACHIR, Department of Ecology and Environment, Faculty of Nature and Life Sciences, University Batna, Batna, Algeria.

Professor, Head of the Faculty of Nature and Life Sciences
How to Cite
GHAZI, C., & SI BACHIR, A. (2022). Growth and reproduction of two cichlids Tilapia zillii and Hemichromis bimaculatus (Teleostei: Cichliformes) in the Saharan hydrosystems (Algeria). Iranian Journal of Ichthyology, 8(4), 322–333. https://doi.org/10.22034/iji.v8i4.688

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