
	Journal of Fisheries and Aquatic Science
	Year: 2011 \| Volume: 6 \| Issue: 4 \| Page No.: 456-471 DOI: 10.3923/jfas.2011.456.471

Some Reproductive Parameters of Synodontis Schall (Bloch and Schneider, 1801) from the River Nile, Egypt

Imam A.A. Mekkawy and Arafa A. Hassan

Abstract: In the present study, some reproductive parameters including sex ratios, sexual maturity, gonadosomatic and gonad indices and fecundity of S. schall from the Nile, Egypt were estimated in relation to standard length, weight, age and months. Different patterns of variations were recorded in these parameters. The females and males of S. schall reached maturation at 28.2 and 29.4 cm, respectively. Gonadosomatic index recorded the higher value during the period from January to July for the females of S. schall. The highest value was recorded in March for the males of S. schall. Gonad index recorded higher values during all months. The number of eggs increased with increase in length. Fecundity exhibited variability with age, length and months in the same locality. Fecundity also showed variations with time and locality when compared with other studies. The largest number of S. schall in the current locality was 102600 which recorded in length of 36 cm during May for S. schall. The egg diameter increased from January to August. The largest diameter (1.44 cm) was recorded during June. The highest value was recorded during March for the females and during May and October for the males of S. schall. In conclusion, S. schall is a fecund fish with variations in time and localities. Also, variability of reproductive parameters with age, size, weight and gonad weight are evident.

PDF Fulltext XML References Citation Report Citation

RELATED ARTICLES:

•	Biological Aspects and Fisheries Management of Tilapia Fish Oreochromis niloticus (Linnaeus, 1758) in El-Bahr El-Faraouny Canal, Al-Minufiya Province, Egypt

•	Fecundity and Egg Size of Grey-Eel Catfish Plotosus canius (Hamilton, 1822) from the Coastal Waters of Kampong Telok, Negeri Sembilan Peninsular Malaysia

•	Review of Some Biological Aspects and Fisheries of Grey-Eel Catfish Plotosus canius (Hamilton, 1822)

•	Studies on Some Reproductive Characters of Tilapia Species in Damietta Branch of the River Nile, Egypt

•	Observation on the Fecundity and Gonado-Somatic Index of Mystus gulio in Brackishwaters of Bangladesh

•	Certain Aspects of the Reproductive Biology of Berzem (Barbus pectoralis) in Karoon River

•	Gonad Maturation Stages of Auchenoglanis occidentalis (Valenciennes 1840) in River Rima, North-Western Nigeria

•	Length-weight Relationships and Fecundity Estimates in Mudskipper, Periophthalmus papilio (Bloch and Schneider 1801) Caught from the Mangrove Swamps of Lagos Lagoon, Nigeria

How to cite this article:

Imam A.A. Mekkawy and Arafa A. Hassan, 2011. Some Reproductive Parameters of Synodontis Schall (Bloch and Schneider, 1801) from the River Nile, Egypt. Journal of Fisheries and Aquatic Science, 6: 456-471.

DOI: 10.3923/jfas.2011.456.471

URL: https://scialert.net/abstract/?doi=jfas.2011.456.471

COMMENT ON THIS PAPER

Navigation


		Online First
		Current Issue
		Previous Issues
		Editorial Board
		Submit a Manuscript
		Guide to Authors
		Subscribe to E-alerts

Indexed In


		ASCI-Database
		Asian Digital Library
		Cambridge Scientific Abstract
		Chemical Abstract Services
		Google Scholar
		ProQuest

Science Alert