University of Khartoum

Aspects of the Biology of Synodntis at Khartoum with Special Reference to S. schall (Bloch-Schnieder 1801)

Aspects of the Biology of Synodntis at Khartoum with Special Reference to S. schall (Bloch-Schnieder 1801)

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Title: Aspects of the Biology of Synodntis at Khartoum with Special Reference to S. schall (Bloch-Schnieder 1801)
Author: Yousif Babiker Abu, Gideiri
Abstract: From the study of Synodontis at Khartoum the following points are concluded: 1. Synodontis clarios is the only species of the genus which possesses branched maxillari barbels. 2. S. filamentous is found at Khartoum while S. eupterus is not. 3. There is probably, a new species at, Khartoum as yet unnamed which resembles S. schall 4. Ratios relating to various parts of the body to one another may be applied in separation of species. 5. Vertebrae are the most reliable part of the skeleton for the age determination of Synodontis. 6. Females are larger than males of equal ages. 7. Different species of Synodontis show rather different growth rates but within narrow limits. 8. Synodontis can be safely described as an omnivorous group of fishes. 9. Food of Synodontis varies with season, locality and length of individual. 10. The species of Synodontis are not all bottom feeders but S. membrahceus and S. batensoda are surface feeders. 11. Sex can be determined externally in fish more than 30 cm long and internally throughout life. 12. Females outnumber males in all localities (57.3 to 42.7). 13. The breeding season of Synodontis lies in August- September. 14. Males mature before females. 15. Gonads show antero-posterior gradation.
URI: http://khartoumspace.uofk.edu/handle/123456789/15682
Date: 2015-06-30


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