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Catch and stocks of common kilka in Iranian waters of the Caspian Sea (1996-2011)
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A.A. Janbaz *   1, H. Fazli , R. Porgholam , D. Kor , Sh. Abdolmaleki |
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Abstract: (10578 Views) |
| The main objective of the present study was qualitative and quantitative assessment of common kilka stocks in Iranian waters of the Caspian Sea during a long period (1996-2011). Over this period, the catch of common kilka fluctuted from 5000 tonnes in 2000 to 9000 tonnes in 2003 and increased from 2004 and was between 14000 tonnes to 27000 in 2004-2011. In the years 1996-2010, catch per unit effort (CPUE) was ranged between 0.07- 3.4 tonnes/(Vessels×Nights) which declined to 2.7 tonnes in 2011. The total biomass and spawning stock biomass (SSB) had a same trend as CPUE. During 1996-2010, the total biomass of common kilka was ranged between 16580-97000 tonnes which declined to 51280 tonnes in 2011. The SSB was ranged between 7513- 38932 tonnes which declined to 28609 tonnes in 2011. In the age compositions of catch, age 2+- 4+ was the largest age group. From 2001 and later, age 3+ and 4+ predominated and the frequency of young specimens 1+ and elderly 6+ strongly declined ( < %1). According to the present study, principles of operation common kilka stocks especially coastal zones prevent damage to reserves. |
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| Keywords: catch, stock assessment, commercial catch, common kilka, Caspian Sea |
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Full-Text [PDF 296 kb]
(2147 Downloads)
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Type of Study: Research |
Subject:
ارزيابي ذخاير و پويايي جمعيت
Received: 2014/05/4 | Accepted: 2014/05/4 | Published: 2014/05/4
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