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Journal of Fisheries and Aquatic Science
  Year: 2013 | Volume: 8 | Issue: 2 | Page No.: 323-339
DOI: 10.3923/jfas.2013.323.339
 
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Studies on Some Reproductive Characters of Tilapia Species in Damietta Branch of the River Nile, Egypt

Midhat A. El-Kasheif, Kariman A. Sh. Shalloof and Mohammad M.N. Authman

Abstract:
Reproduction in fishes is one of the basic biological features enabling the maximum survival and continuation of species. The present study was aimed to investigate some aspects of the reproductive biology of Tilapia spp. inhabited Damietta branch of the River Nile, Egypt, to manage these species in this important fish resource. Tilapia spp. fishes were taken on a seasonally basis over a complete year round from the studied area. Sex ratio, maturity stages, gonadosomatic index (GSI), absolute fecundity and egg diameters were studied. The overall sex-ratio of male to female was 1:0.68 and 1:0.98 which deviates significantly (χ2 = 23.716; p<0.0001 and χ2 = 11.869; p = 0.0078) from the hypothetical distribution of 1:1, for Oreochromis niloticus and Tilapia zillii, respectively, whereas for Sarotherodon galilaeus, the overall sex-ratio was 1:0.81 (χ2 = 2.395; p = 0.4946). The maturity stages of Tilapia spp. were classified macroscopically into five stages. The breeding period (expressed by GSI) of Tilapia spp. exhibited several peaks. Variations found in fecundity and egg diameter were due to differences in reproductive habits of studied species. Fecundity and egg diameter, in Tilapia species were found to depend on length, weight or age of the fish. The data generated in this study are provide knowledge on rational stock utilization, protection of new recruits and the prediction of recruitment variability. So, to protect Tilapia spp. in Damietta branch of the River Nile, Egypt, from exploitation, it is recommended to ban the use of gears with illegal mesh sizes and other destructive fishing methods to allow the fish to breed, grow and recruit into the fishery.
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 RELATED ARTICLES:
  •    Biological Aspects and Fisheries Management of Tilapia Fish Oreochromis niloticus (Linnaeus, 1758) in El-Bahr El-Faraouny Canal, Al-Minufiya Province, Egypt
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How to cite this article:

Midhat A. El-Kasheif, Kariman A. Sh. Shalloof and Mohammad M.N. Authman, 2013. Studies on Some Reproductive Characters of Tilapia Species in Damietta Branch of the River Nile, Egypt. Journal of Fisheries and Aquatic Science, 8: 323-339.

DOI: 10.3923/jfas.2013.323.339

URL: https://scialert.net/abstract/?doi=jfas.2013.323.339

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