ﺑﺮآورد ﺗﻮده زﻧﺪه و ﺻﯿﺪ در واﺣﺪ ﺳﻄﺢ ﻣﺎﻫﯿﺎن ﮐﻔﺰي درﯾﺎي ﻋﻤﺎن ﺑﻪ روش ﻣﺴﺎﺣﺖ ﺟﺎروب ﺷﺪه

Evaluation of demersal trawl survey data for assessing the Biomass and Catch Per Unit Area (CPUA) of demersal fishes in Oman Sea

ﺑﻪ ﻣﻨﻈﻮر ﭘﺎﯾﺶ ذﺧﺎﯾﺮ ﮐﻔﺰﯾﺎن ، ﻣﺤﺎﺳــﺒﻪ ﻣﯿﺰان ﺻــﯿﺪ ﺑﺮ واﺣﺪ ﺳــﻄﺢ و ﺗﻮده زﻧﺪه آﻧﻬﺎ ﺑﻪ روش ﻣﺴــﺎﺣﺖ ﺟﺎروب ﺷــﺪه ﺑﺎ ا ﺳﺘﻔﺎده از ﮐﺸﺘﯽ ﺗﺤﻘﯿﻘﺎﺗﯽ ﻓﺮدوس ﻣﺠﻬﺰ ﺑﻪ ﺗﻮر ﺗﺮال در آﺑﻬﺎي درﯾﺎي ﻋﻤﺎن (ا ﺳﺘﺎن ﺳﯿ ﺴﺘﺎن و ﺑﻠﻮﭼ ﺴﺘﺎن) ﺑﻪ ﻣﻮرد اﺟﺮا درآﻣﺪ. ﻣﻨﻄﻘﻪ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﺑﻪ 5 ﻧﺎﺣﯿﻪ(M,N.O,P,Q) در ﻋﻤﻖ ﻫﺎي 10 ﺗﺎ20 ،20ﺗﺎ 30 ، 30 ﺗﺎ 50 و 50ﺗﺎ 100ﻣﺘﺮ ﺗﻘﺴــﯿﻢ ﮔﺮدﯾﺪ. ﺗﻌﺪاد 68 اﯾﺴــﺘﮕﺎه در ﻃﻮل ﺗﺤﻘﯿﻖ ﻣﻮرد ﺑﺮرﺳــﯽ ﻗﺮار ﮔﺮﻓﺖ. ﺑﯿﺸــﺘﺮﯾﻦ ﻣﯿﺰان ﺑﯿﻮﻣﺎس درﻣﻨﻄﻘﻪ ﻣﯿﺪاﻧﯽ اﺳــﺘﺮاﺗﻮم M ﭘﻨﺠﺰاري ﻣﺎﻫﯿﺎن درﻣﻨﻄﻘﻪ ﻣﮑﯽ ﺳﺮ و ﺗﻨﮓ )اﺳﺘﺮاﺗﻮمM ﯾﺎل اﺳﺒﯽ و ﮐﺮﯾﺸﻮ و در ﻣﻨﻄﻘﻪ ﮔﻮردﯾﻢ، ﮐﻨﺎرك،ﺑﺮﯾﺲ و ﭘﺴﺎﺑﻨﺪر (اﺳﺘﺮاﺗﻮم P,O و Q) ﯾﺎل اﺳﺒﯽ ﻣﯽ ﺑﺎﺷﺪ. ﺑﯿﺸﺘﺮﯾﻦ ﻣﯿﺰان ﺻﯿﺪ در واﺣﺪ ﺗﻼش ﺻﯿﺎدي در ﻻﯾﻪ 2010 ﻣﺘﺮ ﻣﺘﻌﻠﻖ ﺑﻪ ﮔﻮﻧﻪ ﺳﭙﺮ ﻣﺎﻫﯿﺎن، (Rays ) در ﻻﯾﻪ 30-20 ﻣﺘﺮ ﻣﺘﻌﻠﻖ ﺑﻪ ﮔﻮ ﻧﻪ ﺳـــﭙﺮ ﻣﺎﻫ ﯿﺎن و ﻋﺮوس ﻣﺎﻫﯽ در ﻻ ﯾﻪ 50-30 ﻣﺘﺮ ﻣﺘﻌﻠﻖ ﺑﻪ ﮔﻮ ﻧﻪ ﮐﻮﺗﺮ ﻣﺎﻫ ﯿﺎن (Trichiurus lepturus ) ﻣﺘﺮ ﻣﺘﻌﻠﻖ ﺑﻪ ﮔﻮﻧﻪ ﯾﺎل اﺳﺒﯽ 50- (Sphyraenidae) ﻣﺸﺎﻫﺪه ﮔﺮدﯾﺪ. ﺑﺎﻻﺗﺮﯾﻦ ﻣﯿﺰان ﺻﯿﺪ ﺑﺮ وا ﺣﺪ ﺳـــﻄﺢ در ﻣﻨﻄ ﻘﻪ ﺑﺎ ﻣﯿﺰان 7 /26931 ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺎ ﯾﻞ ﻣﺮﺑﻊ ﺑﺪﺳـــﺖ آ ﻣﺪه و ﮐﻤﺘﺮﯾﻦ ﻣﯿﺰان در ﻣﻨﻄ ﻘﻪ Q ﺑﺎ ﻣﯿﺰان 5112/8ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺎﯾﻞ ﻣﺮﺑﻊ ﺑﺪ ﺳﺖ آﻣﺪ. در ﻻﯾﻪ ﻫﺎي ﻋﻤﻘﯽ ﻣﺨﺘﻠﻒ ﻧﯿﺰ ﺑﯿ ﺸﺘﺮﯾﻦ ﻣﯿﺰان ﻣﯿﺰان ﺻﯿﺪ ﺑﺮ واﺣﺪ ﺳﻄﺢ ﺑﻪ ﻻﯾﻪ 20-10 ﻣﺘﺮ ﺑﺎ ﻣﯿﺰان 4 /13315ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺎﯾﻞ ﻣﺮﺑﻊ ﺑﺪ ﺳﺖ آﻣﺪه و ﮐﻤﺘﺮﯾﻦ ﻣﯿﺰان ﻫﻢ ﺑﻪ ﻻﯾﻪ 30-20 ﻣﺘﺮ ﺑﺎ 7434 1 ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺎﯾﻞ مربع ﺑﺪﺳﺖ آﻣﺪ.

The study aims to assess the biomass and Catch Per Unit Area (CPUA) of demersal fish resources in the northern coast of Oman Sea based on trawl survey. The study area was stratified to five strata (M,N,O,P,Q) covering the depth layers of 10-20, 20-30 and 30-50 m. A total of 68 stations were investigated during the study.The highest values of biomass were belong to Leiognathidae in stratum M, Trichiurus lepturus and Saurida tumbil in stratum N and Trichiurus lepturus in stratum O,P,Q. The highest values of CPUA were belong to Rays in 10-20 m, Drepanidae in 20-30m, Sphyraenidae in 30-50m and Trichiurus lepturus in 50-100 m layer depth. The highest and lowest values of CPUA were recorded in stratum M (26931.7) and Q (5112.8), respectively. The highest and lowest values of CPUA were recorded in 10-20m(13315.4) and 20-30m (7434.1),respectively.