Fishery, growth and mortality of coral grouper, Plectropomus maculates Bloch, 1790 (Teleostei: Serranidae), in the coral reefs, Red Sea, Sudan

R. M. Mohamed, A.; Al-Din S. Hanafi, Najem; Y. Al-Dubakel, Adel

doi:10.33762/bagrs.2010.118387

	Fishery, growth and mortality of coral grouper, Plectropomus maculates Bloch, 1790 (Teleostei: Serranidae), in the coral reefs, Red Sea, Sudan
Basrah Journal of Agricultural Sciences
Article 8, Volume 23, 2 (special Issue), 2010, Pages 200-213 PDF (0 K)
DOI: 10.33762/bagrs.2010.118387
Authors
A. R. M. Mohamed; Najem Al-Din S. Hanafi; Adel Y. Al-Dubakel
Abstract
The fishery, growth and mortality of coral grouper (najil), Plectropomus maculates Bloch, 1790 from deep water coral reef and the coastal fringing reef, Arakiyai, Sudanese Red Sea was described. A total of 451,861 kg from more than 48 fish species, in addition to 24,465 kg from sharks and 2,048 kg from lobster were landed during 2007 in the central fish market, Port Sudan. P. maculates formed 5.2% from the total fish landing and the lowest landing (860kg) was in January and the highest landing (4195kg) was in August 2007. Samples of P. maculates were collected during 2003-2004 by cast and gill nets and hook and lines. Mean total length was ranged from 31 cm to 63.9 cm and mean weight from 827.5 to 4550.0g. Length-weight relationship was obtained as W= 0.0251L3.003. The relative condition factor value ranged from 0.944 to 1.060, with mean value of 0.999. The lengths of fish were 31, 41, 48, 54, 59 and 64 cm for the ages 1-6 years respectively. The growth model was Lt= 83 [1-e-0.192 (t + 1.492)]. The growth performance index (ø) of the species was computed as 3.12.Total mortality rate (Z) was computed as 0.568, natural mortality rate (M) as 0.441, fishing mortality rate (F) as 0.127 and the exploitation ratio was 0.224, indicating that the coral grouper stock in Sudanese Red Sea is under exploitation.

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