A survey catch per unit area and species diversity on based to depth changes of polynemidae in the Sea of Oman (Coastal waters of Sistan & Baluchistan Province)

Subject Areas : New Technologies in Aquaculture Development

Received: 2021-02-03 Accepted : 2021-02-03 Published : 2013-08-23

Keywords: Species Diversity, Sea of Oman, Keywords: Polynemidae, Trawl net, CPUA,

Abstract :

Abstract[1] The Polynemidaes is one of the great importance demersal fishes in the Oman Sea that research about them seems to be necessary. This research was down with the research trawler (Ferdos 1). The area was researched is from field (58 ْ 55') to the Goiter Gulf (61 ْ 25') and depth of 10 to 100 meters that all of them are 1164 square mile of the sea. This area divided from west until east to the 5 regions (A, B, C, D, E) with 30 minutes of longitude and every area with deep layer of 10-20 meters, 20-30 meters, 30-50 meters and 50-100 meters were determined. In all of research, the number of station determined and the catch sampling with the trawl in one hours was down then the statue of the spices per unit area (CPUA) and the biomass of Polynemidaes separately in ever deep layer was estimated that the maximum average in per unit for one spices in one layer corresponding to the Polynemidae five filament in layer B with 8387.25 Kg and the least (minimum) average related to Polynemidae six filament in layer D with 1.02 Kg in square mile. The six filament spices in layers E and C not exist and the spices (Eleutheronema tetradaytylum) its maximum value in layer E with 571.78 kg in square mile. Although the average index in per unit based on deep layer indicated that Polynemidae six filaments (Polydactylus sextarius) with 1 kg at the depth of 20-30 meter have minimum and with the 5358 kg at the depth of 30-50 meter have maximum value catch. The value of the critical p for comparison of the catch spices in per unit (CPUA) indicates that Polynemidae with filament (P. plebeius) in the layer and the normal (general) Polynemidae in the depth layer have significant different but this significant various not exist in layer but in depth have significant different for polynemidae six filament. According to the calculated CPUA, the result showed that there is a schooling stock of Polynemidae in deep area of 30 to 100m (Biyahi to the head of Meydani) in the region. * Corresponding Authors; Email: [e-mail]