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Fishery, growth and mortality of the threadfin bream, Nemipterus japonicus (Bloch, 1791) (Pisces: Nemipteridae) from the southern Sudanese waters, Red Sea | ||
| Basrah Journal of Agricultural Sciences | ||
| Article 7, Volume 23, 2 (special Issue), 2010, Pages 187-199 PDF (0 K) | ||
| DOI: 10.33762/bagrs.2010.118386 | ||
| Authors | ||
| Najem Al-Din S. Hanafi; A. R. M. Mohamed; Adel Y. Al-Dubakel | ||
| Abstract | ||
| The fishery, growth and mortality of the threadfin bream, Nemipterus japonicus (Nemipteridae) from the southern region of the Sudanese Red Sea was assessed. Fishes were collected from the Tawkar fishing region, south Sawakin, by trawl net during 2003-2004. The total fish caught during the experiment period was 33,000 kg, of this 3,586 kg where threadfin bream. The species constituted 10.8% of the total catch. The average total catch per unit of effort was 83.3 kg/hr and for the threadfin bream was 9.0 kg/hr. Length-weight relationship was calculated and yields the following equation: W=0.021 L 2.85 for fish ranged from 12-19 cm. The relative condition factor of the species ranged from 0.90 to 1.04 (mean ± S.D 0.976 ± 0.0468). The population parameters estimated for the threadfin bream were L∞= 22.8cm, K= 0.36 and to= 1.374. The growth performance index (ø) of the species was computed as 2.27.Total mortality rate (Z) was computed as 0.939, natural mortality rate (M) as 0.763, fishing mortality rate (F) as 0.176 and the exploitation ratio was 0.187, indicating that the threadfin bream stock in Sudanese Red Sea is under exploitation. | ||
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