Stock assessment of the bony fishes in Iranian coastal waters of the Caspian Sea (2007-2010)
2011
Fazli, H. | Nahrevar, R. | Khedmati, K. | Taleshian, H. | Bagherzadeh, F. | Larijani, M. | Farabi, M.V. | Soleimaniroudi, A. | Vahedi, F. | Rastin, R. | Pourmand, T.M. | Elyasi, F. | Dashti, A. | Moghim, M. | Salarvand, G. | Nazaran, M. | Kor, D. | Ramazani, H. | Hashemian, A. | Nasrabadi, A.R. | Ghaninejad, D. | Nikpor, M.
In the years 2007-2007, 2008-2009 and 2009-2010 the exploitation of bony fishes resources (by 131 beach seines) started on 12 October but finished on 9 April, 9 April and 13 April, respectively. During these periods the total catch of bony fishes were 23537.8, 20045.5 and 18664.8 tonnes, respevtively. During these periods, kutum predominated and represented the highest proportion of total catch at 73.1, 74.0 and 66.9% , followed by golden grey mullet at 18.3, 13.9 and 18.7%, respectively. K values calculated 0.22, 0.15 and 0.14 year-1 and L∞ were 66.0, 62.7 and 70.0 cm for kuttum, golden grey mullet and common carp, respectively. The instantaneous coefficient natural mortality were estimated as 0.386 and 0.35 year-1 for kutum and golden grey mullet, respectively. During three periods, the exploitation rates were 0.789, 0.584 and 0.614 for kutum and 0.71, 0.75 and 0.61 for golden grey mullet, respectively. In the years 2007-2007, 2008-2009 and 2009-2010, the total biomass, from the biomass-based cohort analysis were 56600, 62090 and 61590 tonnes for kutum and and MSY estimated about 24733.7 and 8550.4 tones for kuttum and 11040, 11900 and 14460 tonnes for golden grey mullet, respectively. The ABC (acceptable biological catch) were estimated as 8000 and 2200 tonnes.
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