Fisheries and stock assessment of shilig, Leuciscus vorax Heckel, 1843 in East Hammar marsh, Southern Iraq
Iraqi Journal of Aquaculture,
Volume 14, Issue 1, Pages 29-46
AbstractThe fisheries and stock assessment of shilig Leuciscus vorax (Aspius vorax) the in East Hammar marsh, which is the first study to assess this species in southern Iraq. A total of 5751 specimens was collected by several fishing gears for a period of January in 2009 until May in 2010. Total lengths of L. vorax were ranged from 3.7 to 55.6 cm was as total length. The species constituted 6.4% from the total catch by seine net and the catch rate ranged from 0.84 kg/hr in May 2009 to 3.33 kg/hr in January 2010 and rate 2.01 kg/hr. The length-weight relationship obtained was W= 0.0068 x L3.0425. The fish stock was assessed by lengths, frequency technique using FiSAT program. Growth, mortality parameters and exploitation rate estimated were: L∞= 65.1 cm, K= 0.22, Z= 0.96, M= 0.5, F= 0.46, E= 0.48, E0.1= 0.411 and Emax= 0.52. Recruitment pattern of the species exhibited single pulse modal contributed 45% of the total recruits for the period April-September with a peak during June-August. The mature individuals of L. vorax were exposed to fishing before the spawning season in Eastern Al-Hammar marsh, because the value Lc (18.3 cm) is lower than Lm (21.5 cm). Therefore, this study suggests increasing the mesh size and regulating the fishing effort.
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