The catch per unit of swept area (CPUA) and estimated biomass of large head hairtail (Trichiurus lepturus) with an improved trawl in the Persian gulf and gulf of Oman Iran

Shojaei Mehdi Ghodrati, . and Motlagh Seyyed Amin Taghavi, . The catch per unit of swept area (CPUA) and estimated biomass of large head hairtail (Trichiurus lepturus) with an improved trawl in the Persian gulf and gulf of Oman Iran. pp. 209-217. ISSN 0116-6514

The Kish trawler fleet targets large head hairtail (Trichiurus lepturus) in the Persian Gulf and the Gulf of Oman. These vessels are equipped with a new improved trawl. The objectives of this study were (i) to estimate the catch per unit area (CPUA) and biomass of T.lepturus (ii) to identify the catch composition and percentage of target and bycatch species in the total catch and (iii) to compare the CPUA between two selected strata using a bottom trawl survey. Surveys were conducted during the periods August to October 2007 in the Persian Gulf and Gulf of Oman. The sampling area was divided into two strata and a stratified random sampling design was used to determine sampling sites. Catch per unit of area varied significantly between the two selected strata (P0.001). Mean CPUA for T.lepturus in the total area was 4 308 kg nm-2. The total biomass of T.lepturus was estimated to be 842 tonnes in stratum 1 and 1 430 tonnes in stratum2.Trichiurus lepturus made up 74.4 of the total weight in stratum 1 and 70.02 in stratum 2. Among the non-target species in the trawl catches the species with highest catch rate were Pampus argenteus (4.629) Batoids (2.274) Carangidae (2.693) and Ilisha sp. (2.672) in stratum 1 and Carangidae (5.710) P. argenteus (5.245) Batoids (3.256) and Ilisha sp. (2.995) in stratum 2.

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Abstract

The Kish trawler fleet targets large head hairtail (Trichiurus lepturus) in the Persian Gulf and the Gulf of Oman. These vessels are equipped with a new improved trawl. The objectives of this study were (i) to estimate the catch per unit area (CPUA) and biomass of T.lepturus (ii) to identify the catch composition and percentage of target and bycatch species in the total catch and (iii) to compare the CPUA between two selected strata using a bottom trawl survey. Surveys were conducted during the periods August to October 2007 in the Persian Gulf and Gulf of Oman. The sampling area was divided into two strata and a stratified random sampling design was used to determine sampling sites. Catch per unit of area varied significantly between the two selected strata (P0.001). Mean CPUA for T.lepturus in the total area was 4 308 kg nm-2. The total biomass of T.lepturus was estimated to be 842 tonnes in stratum 1 and 1 430 tonnes in stratum2.Trichiurus lepturus made up 74.4 of the total weight in stratum 1 and 70.02 in stratum 2. Among the non-target species in the trawl catches the species with highest catch rate were Pampus argenteus (4.629) Batoids (2.274) Carangidae (2.693) and Ilisha sp. (2.672) in stratum 1 and Carangidae (5.710) P. argenteus (5.245) Batoids (3.256) and Ilisha sp. (2.995) in stratum 2.

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Item Type:	Article
AGROVOC Term:	Trichiurus lepturus
AGROVOC Term:	Catch rate
AGROVOC Term:	Hairtail fish
AGROVOC Term:	Biomass
AGROVOC Term:	Trawling
AGROVOC Term:	Persian Gulf
AGROVOC Term:	Gulf of Oman
AGROVOC Term:	Ocean station vessels
AGROVOC Term:	Catch composition
AGROVOC Term:	Bycatch
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23737

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