Show simple item record

dc.contributor.authorFazli, H.
dc.contributor.authorDaryanabard, G.R.
dc.contributor.authorPourgholam, R.
dc.contributor.authorAbdolmalaki, Sh.
dc.contributor.authorBandani, A.
dc.contributor.authorPourgholami, A.
dc.contributor.authorSafavi, S.A.
dc.coverage.spatialIranen_US
dc.coverage.spatialCaspian Seaen_US
dc.date.accessioned2017-11-28T19:55:06Z
dc.date.available2017-11-28T19:55:06Z
dc.date.issued2012
dc.identifier.issn1026-1354
dc.identifier.urihttp://hdl.handle.net/1834/10622
dc.description.abstractThe main objective of the present study was qualitative assessment of Caspian kutum (Rutilus frisii kutum Kamensky 1901) stocks by using indicators of overfishing, condition factor and relative weight in Iranian waters of the Caspian Sea during a long period (1991- 2011). Three fisheries indicators in catch were: 1) percentage of mature fish, with 100% as target; 2) percent of specimens with optimum length, with 100% as target; and 3) percentage of mega-spawners, with 0% as target, and if no upper size limit exists, 30-40% as representative of reasonable stock structure. Over this period, the condition factor and relative weight had a decreasing trend. The range of length with optimum yield was between 40 and 48 cm. The mega-spawner measured as fish a size larger than 48 cm. According to these three indicators, the percentage of mature (fork length>40cm), optimum size and mega-spawners were 62.0, 40.9 and 12.5% in 1991-92 which decreased less than 50, 38.2 and 8%, in the years 1992-2011, respectively. The length structure is a matter of concern. Therefore, for reservation and rebuilt of kutum in the Caspian Sea, the target was to let all (100%) fish spawn at least once, using bigger mesh size in cod end (e.g. 35mm, during whole fishing season). The aim was also to implement a fishing strategy that result no (0%) mega-spawners being caught, and the main catch focus on optimum length.en_US
dc.language.isofaen_US
dc.subject.otherRutilus frisii kutumen_US
dc.subject.otherCaspian kutumen_US
dc.titleQualitative assessment of Caspian kutum (Rutilus frisii kutum Kamensky 1901) stocks in Iranian waters of the Caspian Sea (1991-2011)en_US
dc.typeJournal Contributionen_US
dc.bibliographicCitation.issue2en_US
dc.bibliographicCitation.titleIranian Scientific Fisheries Journalen_US
dc.bibliographicCitation.volume21en_US
dc.description.statusPublisheden_US
dc.format.pagerangepp.53-64en_US
dc.subject.asfaStock assessmenten_US
dc.subject.asfaFisheries indicatorsen_US
dc.subject.asfaSpawner fishen_US
dc.subject.asfaFishen_US
dc.type.refereedRefereeden_US
refterms.dateFOA2021-01-30T18:48:21Z


Files in this item

Thumbnail
Name:
ISFJ-v21n2p53-fa.pdf
Size:
439.6Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record