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aqua 15(4)_Gobiidaqua 15(4)_Pictichromis

aqua 15(4)_Oreochromis

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Volume 15, Issue 4

15 October 2009

Shnoudy A. Bakhoum: Biometric characteristics and some biological features of natural hybrids between Nile tilapia Oreochromis niloticus and blue tilapia Oreochromis aureus in Lake Edku, Egypt, pp. 191-204


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SINGLE PAPER

Volume 15, Issue 4

15 October 2009

Shnoudy A. Bakhoum: Biometric characteristics and some biological features of natural hybrids between Nile tilapia Oreochromis niloticus and blue tilapia Oreochromis aureus in Lake Edku, Egypt, pp. 191-204

Abstract
Oreochromis niloticus, O. aureus and specimens with an external appearance intermediate between these putative parents were sampled from Lake Edku and examined to determine the hybrid nature of the intermediate specimens. The results of hybrid index, principal component analysis, discriminant function analysis and the Mann-Whitney U-test indicated the hybrid nature of these specimens and determined the most suitable biometric characters to distinguish different hybrid types from the parent species. Hybrid specimens represented about 28% of the total catch of Lake Edku. Hybrids have a higher percentage of males than females. Hybrids become mature at a smaller size and their reproductive activity is lower than that of the parent species. The natural mortality of hybrids is higher than that of the parent species. 











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aqua International Journal

aqua is a fully peer-reviewed
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every January, April, July and October
by Aquapress Publishers
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© aqua, International Journal of Ichthyology
ISSN 0945-9871

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aqua is an international journal which publishes original scientific articles in the fields of systematics, taxonomy, bio-geography, ethology, ecology, and general biology of fishes since 1994. Papers on freshwater, brackish, and marine fishes will be considered. aqua is fully refereed and aims at publishing manuscripts within 2-4 months of acceptance. In view of the importance of colour patterns in species identification and animal ethology, authors are encouraged to submit colour illustrations in addition to descriptions of coloration. It is our aim to provide the international scientific community with an efficiently published journal meeting high scientific and technical standards.

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The editors welcome the submission of original manuscripts which should be sent in digital format to the scientific editor. 
Full length research papers and short notes will be considered for publication. There are no page charges and colour illustrations will be published free of charge. Authors will receive one free copy of the issue in which their paper is published and an e-print in PDF format.

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