Square mesh windows (SMWs) with 75 (75SMW; 37.5 mm bar length) and 90 mm (90SMW; 45 mm bar length) nominal mesh size were tested for determining size selectivity in dhow prawn fisheries of the Persian Gulf (Hormuzgan province). Fishing trials were conducted on the commercial fishing grounds of Hormuzgan province of the northern Persian Gulf by commercial dhow trawler. Covered codend methods were utilized for collecting data during October and November 2012. Totally 21 and 16 valid hauls were performed with 75SMW and 90SMW, respectively. The mean L50 values of 75SMW 9 SMW . ± . .7 ± . Penaeus merguiensis) .9 ± . .9 ± . Jinga shrimp (Metapenaeus affinis) 8. ± . 8 9. ± . ork length for Indian ilisha (Ilisha melastoma), and 8. ± . 8. ± . k ulphur goatfish (Upeneus sulphurous), respectively. This study clearly shows that there is not any notable different in size selectivity of square mesh windows with different mesh sizes for investigated species. Future studies on different by-catch reduction methods such as full square mesh codends or grids should improve size selectivity of the species and efforts to reduce by-catch in this fishing system.
___
Alverson, D.L., Freeberg, M.H., Pope, J.G. and Murawisk, S.A., 1994. A global assessment of fisheries by-catch and discards. FAO Fisheries Technical Paper. 339, 1-233.
Alverson, D. L. and Hughes, S.E. 1996. By-catch: from emotion to effective natural resource management. Review in Fish Biology and Fisheries, 6, 443-442. Doi: 10.1007/BF00164325.
Alverson, D. L. 1997. Global assessment of fisheries by- catch and discards: a summary overview, Global Trends. Fisheries Management American Fisheries Society Symposium 20, 115-125.
Arkley, K. 1990. Fishing trials to evaluate the use of square mesh selector panels fitted to Nephrops trawls - MFV `Heather Sprig' (BCK 181). Seafish Report No. 383.
Ay ı C. T k ç A. U ş A. M k y B. Ş T. 2011. Selectivity of 40 mm square and 50 mm diamond mesh codends for five species in the eastern Mediterranean demersal trawl fishery. African Journal of 10.5897/AJB11.1495. 5037-5047. Doi:
Ay ı C. Ş T. Öz Y. T ğ Z. 2014. The effect of number of meshes around protective bag circumference on size selectivity of demersal trawl Ichthyology, 30: 454-462. Doi: 10.1111/jai.12413.
Azar, R. 1981. Report of distribution and abundance of By- catch species in shrimp trawls of the Persian Gulf. Publication of Iranian Fisheries Organization. 56P. (In Persian).
Briggs, R.P. and Robertson, J.H.B. 1993. Square mesh panel studies in the Irish Sea. ICES CM1993/B:20.
Broadhurst, M.K., Millar, R.B., Kennelly, S. J., Macbeth, W. G., Young, D.J. and Gray, C. A. 2004. Selectivity of conventional diamond- and novel square-mesh codends in an Australian estuarine penaeid-trawl fishery. Fisheries Research, 67, 183-194. Doi: 10.1016/j.fishres.2003.09.043.
Broadhurst, M.K., Macbeth, W.G. and Wooden, M.E.L. 2005. Reducing the discarding of small prawns in NSW's commercial and recreational prawn fisheries. Final Report to the Fisheries Research & Development Corporation. Project No. 2001/031. NSW Department of Primary Industries - Fisheries Final Report Series No. 71. 203pp.
Broadhurst, M.K. and Millar, R.B. 2009. Square-mesh codend circumference and selectivity. ICES Journal of Marine Science, 66, 566-72. Doi: 10.1093/icesjms/fsp001.
Campos, A., Fonseca, P. and Henriques, V., 2003. Size selectivity for four fish species of the deep ground fish assemblage off the Portuguese southwest coast: evidence of mesh size, mesh configuration and codend catch effects. Fisheries Research, 63, 213-233. Doi: 10.1016/S0165-7836(03)00060-2.
Catchpole, T.L. and Gray, T.S. 2010. Reducing discards of fish at sea: a review of European pilot projects. Journal of Environment Management, 91, 717-723. Doi: 10.1016/j.jenvman.2009.09.035.
ConStat, 1995. CC selectivity Granspaettevej 10, DK-9800Hjjlarring, Denmark.
Crowder, L.B. and Murawski, S.A. 1998. Fisheries bycatch: Implications for management. Fisheries, 23, 8-17.Doi: 10.1577/1548-8446(1998)023_____0008:FBIFM>2.0.CO;2.
Deval M:C:,Bök T., A teş, Selectivity of PE and PA material cod ends for rose shrimp Parapenaeus longirostris in Turkish twin rigged beam trawl fishery. Fisheries Research, 81, 72- 79. Doi: 10.1016/j.fishres.2006.05.007.
Froese, R. and Pauly, D. 2015. FishBase. Available at www.fishbase.org. Retrieved 7 September 2015.
Fryer, R.J. 1991. A model of between-haul variation in selectivity. ICES Journal of Marine Science, 48: 281- 290. Doi: 10.1093/icesjms/48.3.281.
Graham, K.J., Broadhurst, M. and Millar, R.B. 2009. Effects of codend circumference and twine diameter on selection in south-eastern Australian fish trawls. Fisheries Research, 95, 341-349. Doi: 10.1016/j.fishres.2008.10.001.
Ibrahim, M.A., El-Bary, K.A. and Al-Khayat, J.A. 1989. By-catch of commercial bottom trawl fishery from Qatar waters. Qatar University Science Bulletin, 9, 309-319.
Kampf, J. and Sadrinasab, M. 2006. The circulation of the Persian Gulf: a numerical study. Ocean Science, 2, 27-41. Doi: 10.5194/os-2-27-2006.
Kamrani, E., Mojazi A.B. and Safaee, M. 2005. Reproductive biology of Jinga Shrimp (Metapenaeus affinis) in coastal waters of Hormozgan province, Southern Iran. Iranian scientific fisheries journal. 13 (4), 151-160.
Kazemi, S.H., Paighambari, S.Y. and Abaspour Naderi, R. 2014. By-catch and Discard composition of dhow Penaeid Trawl Fisheries in Hormuzgan Province, the Northern Persian Gulf. J. Persian Gulf (Marine Science). 5, 49-56.
. . D . An update. FAO Fisheries Technical Paper No. 470. Rome: FAO, 131 pp. M C. Öz H. T ğ Z. Gökç G. Ay ı C. M G. U ş A. yk ç H. Lök A. Düz ı F.O. T k ç A. . E square mesh escape window on codend selectivity for three fish species in the Aegean Sea. Turkish Journal of Veterinary and Animal Science, 29, 461-468, 2005 Ohaus, T. 1990. By-catch. Pacific Fishing. 1990, 44-51. Paighambari, S.Y. 2003. Study on efficiency of some By catch Reduction Devices in Shrimp Trawling in the Persian Gulf. Ph.D Thesis. Tarbiat Modares University. Marine Science Faculty.112p. Paighambari, S.Y., Taghavi, S.A., Ghadairnejad, S.H., Seyfabadi, J. and Faghihzade, S. 2003. Comparing the effect of several BRD on reducing commercial species fishing smaller than LM50 in shrimp trawls fishery in the Persian Gulf. Iran Journal of Fisheries Science, 12, 13-33. (In Persian). Pope, J.G. 1991. The ICES multi-species assessment working group: Evolution, insights, and future problems. ICES Journal of Marine Science, 193, 22- 33. Robertson, J., and Shanks, A., 1994. Analysis of fishing trials, using the twin trawl system, of nets with windows of square mesh, SOAFD, MAFF, Scottish Fisheries Working Paper, 2/94. Robertson, J.H.B. 1993. Design and fitting of square meshwindows in whitefish and prawn trawls and seine nets. Scottish Fisheries Information Pamphlet No. 20. Rogers, D.R., Rogers, B.D., de Silva, J. and Wright, V.L. 1997. Effectiveness of four industry-developed by- L . Fisheries Bulletin, 95, 552-565. Safaei, M. 2005. Population dynamics banana shrimp (Penaeus merguiensis) in coastal waters of Hormozgan province. Pajouhesh and Sazandegi. 67, 50-61. (In Persian). Sala, A., Lucchetti, A. and Buglioni, G. 2007. The influence of twine thickness on the size selectivity of polyamide codends in a Mediterranean bottom trawl. Fisheries Research, 83, 192-203. Doi: 10.1016/j.fishres. 2006.09.013. Schoning, R.W., Jacobsen, R.W., Alverson, D.L., Gentle, T.H. and Auyong, J. 1992. Proceedings of the National Industry By-catch Workshop, February 4-6, 1992, Newport, Oregon (available from Natural Resources Consultants, 4055 21st W., Seattle, WA 98199). Suuronen, P. 2005. Mortality of fish escaping trawl gears. FAO Fisheries Technical Paper, 478. 87 pp. S P. A. M. : A fi selectivity in the Mediterranean. FAO COPEMED Report No. 9, Rome, Italy, 57 pp. Thorsteinsson, G. 1992. Experiments with square mesh windows in the Nephrops trawling off South Iceland. ICES CM, B, p. 3. T k ç A. Öz . H. T ğ Z. . E PA and PE material on codend selectivity in Turkish bottom trawl. Fisheries Research, 67: 317-327. Doi: 10.1016/j.fishres.2003.10.001. Ulmestrand, M. and Larsson, P.O. 1991. Fishing trials with 70 mm square mesh in the top of a Norwegian lobster trawl. ICES Fish. Technology and Fishing Behaviour Working Group. Ancona, 22-24 April. UNEP., 1999. Overview on Land Based Sources and Activities Effecting the Marine Environment in the ROPME Sea Area. UNEP/GPA coordination office and ROPME 127 pp. Valinassab, T., Zarshenas, G.A., Fatemi, M.R. and Otobidae, S.M. 2006. By-catch composition of smallscale prawn trawlers in the Persian Gulf (Hormuzgan province), Iran. Iran Journal of Fisheries Science, 15, 129-138. (In Persian). Whitaker, J.D., De Lancey, L.B. and Jenkins, J.E. 1992. A pilot study to examine the efficiency of finfish excluder devices in a shrimp trawl. Final Report, Project Number F-47. South Carolina Wildlife and Marine Resources. Dep., Charleston, p. 23. Wileman, D.A. Ferro, R.S.T. Fonteyne, R. and Millar, R.B. (eds.). 1996. Manual of Methods of Measuring the Selectivity of Towed Fishing Gears. Copenhagen, ICES Cooperative Research Report No. 215. pp. 126. Yimin, Y., Alsaffar, A.H. and Mohammed, H.M.A. 2000. By-catch and discards of the Kuwait shrimp fishery. Fisheries Research, 45, 9-19. Doi: 10.1016/S0165- 7836(99)00105-8