The Reproductive Biology of Brycinus nurse (Paugy 1986), Pisces: - Characidae in Asa Reservoir, Ilorin, Nigeria

J.K. Saliu; S.O. Fagade

Article Details

The Reproductive Biology of Brycinus nurse (Paugy 1986), Pisces: - Characidae in Asa Reservoir, Ilorin, Nigeria

Authors:

J.K. Saliu | S.O. Fagade

Publisher:

Trabzon Su Ürünleri Merkez Araştırma Enstitüsü

Journal:

Turkish Journal of Fisheries and Aquatic Sciences 2003 Vol.3 Issue 1

Document Type:

Article

Publication Date:

1/2003

Document Language:

Turkish

Document ID (Org No.):

2000838688

Frequency:

Quarterly

pISSN:

1303-2712

Keywords:

Abstract:

 

A total of 980 specimens of Brycinus nurse caught in Asa reservoir from November 1991 to October 1993 were examined for reproductive attributes. Female dominance was observed within the population, with a sex ratio of 1.0 male to 1.78 females. The fish spawns during the rainy season from March to August, with peak spawning in March, June and July, months coinciding with the onset of the rains and flooding. The Gonadosomatic Index (G.S.I) of the population of B.nurse in Asa reservoir ranged between 0.02-29.25% with a mean of 6.43 varying with season, size of fish, sex and stage of gonadal maturity. The absolute fecundity ranged between 1,720 - 68,700 eggs with a mean of 18,281 eggs while relative fecundity ranged from 19,933 to 849,453 eggs /kg with a mean of 345,000 eggs /kg of body weight. The fecundity increased with gonad weight, but showed no significant relationship with body size. Egg diameter ranged from 0.49 to 0.82 mm with a mean of 0.63 mm. The River Asa population of B.nurse had lower mean values of G.S.I, egg diameter, and relative fecundity but higher estimates of absolute fecundity than other populations, previously studied. These differences were thought to have emanated from differences in geographical location. 	 	 		 .

 

A total of 980 specimens of Brycinus nurse caught in Asa reservoir from November 1991 to October 1993 were examined for reproductive attributes. Female dominance was observed within the population, with a sex ratio of 1.0 male to 1.78 females. The fish spawns during the rainy season from March to August, with peak spawning in March, June and July, months coinciding with the onset of the rains and flooding. The Gonadosomatic Index (G.S.I) of the population of B.nurse in Asa reservoir ranged between 0.02-29.25% with a mean of 6.43 varying with season, size of fish, sex and stage of gonadal maturity. The absolute fecundity ranged between 1,720 - 68,700 eggs with a mean of 18,281 eggs while relative fecundity ranged from 19,933 to 849,453 eggs /kg with a mean of 345,000 eggs /kg of body weight. The fecundity increased with gonad weight, but showed no significant relationship with body size. Egg diameter ranged from 0.49 to 0.82 mm with a mean of 0.63 mm. The River Asa population of B.nurse had lower mean values of G.S.I, egg diameter, and relative fecundity but higher estimates of absolute fecundity than other populations, previously studied. These differences were thought to have emanated from differences in geographical location. 	 	 		 .

Article Details

The Reproductive Biology of Brycinus nurse (Paugy 1986), Pisces: - Characidae in Asa Reservoir, Ilorin, Nigeria

Authors:

J.K. Saliu | S.O. Fagade

Publisher:

Trabzon Su Ürünleri Merkez Araştırma Enstitüsü

Journal:

Turkish Journal of Fisheries and Aquatic Sciences 2003 Vol.3 Issue 1

Document Type:

Article

Publication Date:

1/2003

Document Language:

Turkish

Document ID (Org No.):

2000838688

Frequency:

Quarterly

pISSN:

1303-2712

Brycinus nurse

Characidae

Reproductive biology

Nigeria

Issues

Article Details

The Reproductive Biology of Brycinus nurse (Paugy 1986), Pisces: - Characidae in Asa Reservoir, Ilorin, Nigeria

Authors: J.K. Saliu | S.O. Fagade

Publisher: Trabzon Su Ürünleri Merkez Araştırma Enstitüsü

Journal: Turkish Journal of Fisheries and Aquatic Sciences 2003 Vol.3 Issue 1

Document Type: Article

Publication Date: 1/2003

Document Language: Turkish

Document ID (Org No.): 2000838688

Frequency: Quarterly

pISSN: 1303-2712

Brycinus nurse

Characidae

Reproductive biology

Nigeria

Issues

Authors:

J.K. Saliu | S.O. Fagade

Publisher:

Trabzon Su Ürünleri Merkez Araştırma Enstitüsü

Journal:

Turkish Journal of Fisheries and Aquatic Sciences 2003 Vol.3 Issue 1

Document Type:

Article

Publication Date:

1/2003

Document Language:

Turkish

Document ID (Org No.):

2000838688

Frequency:

Quarterly

pISSN:

1303-2712