FISHERY MANAGEMENT OF THE NILE CATFISH SCHILBE (SCHILBE) MYSTUS (LINNAEUS, 1758) FROM THE RIVER NILE, CAIRO SECTOR | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 16, Volume 1, Issue 2, June 1997, Page 269-289 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.1997.3390 | ||||
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| Authors | ||||
| Adel Tharwat1; Waheed Emam2 | ||||
| 1Cairo Univ., Fac. of Agriculture, Animal Production Dept, Giza,Egypt. | ||||
| 2Ain Shams Univ., Fac. of Science, Zool. Dept., Cairo, Egypt | ||||
| Abstract | ||||
| Samples of the catfish, Schilbe (Schilbe) mystus were monthly collected from the Cairo sector of the River Nile in the period from January 1996 to May 1997 by using two common fishing gears namely; El-Nakaria and El-Mehair. The spawning season of this catfish extends from May to August. The sex ratio for males and females was about 1 :1.4 and they reach their first sexual maturity at about 17 cm of their total length which corresponding to age of about 1.3 year. The estimated gear selectivity for El-Nakria was 15.7 cm, while that for El-Mehair was 21.9 cm. The total mortality coefficients for catfishes gilled by El-Nakaria and El- Mehair nets were 1.49 and 1.36 per year, respectively, while their respective exploitation rates were 0.53 and 0.48. The yield and biomass per recruit were computed for S. mystus obtained by each type of nets and recommendation necessary for proper management of the fisheries of this species have been discussed. | ||||
| Keywords | ||||
| Nile catfish; fishery management; mortality rate; gear selectivity; yield per recruit | ||||
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