Abstract
Bu
çalışmada, dip trol ağlarında yatay ayırıcı panel kullanımının etkinliği
araştırılmıştır. Bu amaçla, 900 göz kesimli trol ağı, giriş kısmından itibaren
mantar ve kurşun yakanın birleştiği noktadan yatay olarak ikiye ayrılmış, alt
ve üst panel oluşturulmuştur. Denemeler Gülbahçe Körfezinde 29.04.2013 – 08.05.2013
tarihleri arasında “EGESÜF” araştırma gemisi ile yürütülmüştür. Çekim süresi 45
dakika ile standardize edilmiştir. Alt ve üst bölümde yakalanan türlerin
alıkonulması için 20 mm ağ göz boyunda düğümsüz poliamid materyalden yapılmış
torbalar kullanılmıştır. Yakalanan bireyler tür bazında ayrılmış sayı ve
ağırlıkları alınmıştır. Ayrıca alt ve üst torbada yakalanan barbunya (Mullus barbatus), ısparoz (Dipldus annularis), kırma mercan (Pagellus erythinus) ve izmarit’e (Spicara maena) ilişkin total boy ölçümleri
yapılmıştır. Alt ve üst torbada yakalanan türlerin ağırlık olarak miktarları
arasında farklılık olup olmadığı t testi ile sınanmıştır. Alt ve üst torbada yakalanan
barbunya, ısparoz, k. mercan ve izmarit bireylerinin boy grupları arasında
farklılığın olup olmadığı Kolmogorov-Smirnov testi ile belirlenmiştir. Toplamda
21 geçerli çekim gerçekleştirilmiştir. Ağırlık olarak tüm türlerin % 80’i alt
torbada % 20’si üst torbada yakalanmıştır. Ağırlık olarak alt ve üst torbada
yakalananlar arasında fark bulunmuştur (P <0,05). Barbunya %96, ısparoz %87
ve k mercan %65 ile alt torbada yakalanırken, izmarit %69 ile üst torbada daha
fazla oranda yakalanmıştır. İlerideki çalışmalarda balık davranışları da göz
önünde bulundurularak kare gözlü torba, ızgara vb. çoklu sistemlerin beraber
kullanılması ile çok sayıda türün bir arada yakalandığı demersal trol
balıkçılında daha etkin sonuçlara ulaşılabileceği düşünülmektedir.
Keywords
Yatay ayırıcı panel dip trolü Mullus barbatus Diplodus annularis Pagellus erythinus Spicara maena
References
- Anonymous (2016). Notification 4/1 Regulating Commercial Fishing (in Turkish). Republic of Turkey, Minister of Agriculture and Rural Affair, General Directorate of Conservation and Inspection, Ankara, 68 pp
- Aydın, C., Tosunoğlu, Z. & Tokaç, A. (2008). Sorting grid trials to improve size selectivity of red mullet (Mullus barbatus) and annular sea bream (Diplodus annularis) in Turkish bottom trawl fishery. Journal of Applied Ichthyology, 24: 306-310. DOI: 10.1111/j.1439-0426.2007.01052.x.
- Aydın, C., Aydın, İ. (2008). Deterimed fish species caught lower and upper part of tradiotional trawl codend (In Turkish). Journal of FisheriesSciences.com, 2, 367-374. DOI: 10.3153/jfscom.mug.200725
- Bailey, R.S., Galbraith, R.D., Hutcheon, J.R. & Walsh, M. (1983). Experimental fishing for Norway pout using a horizontally-divided trawl. ICES CM 1983/G:60.
- Campos, A. & Fonseca, P. (2004). The use of separator panels and square mesh windows for by-catch reduction in the crustacean trawl fishery off the Algarve (South Portugal). Fisheries Research, 69, 147–156. https://doi.org/10.1016/j.fishres.2004.05.009.
- Conolly, P.C. (1992). Bycatch activities in Brazil. Brazilian National Environment Institute, Southern Fisheries Research Centre, IBAMA, 43p.
- Engas, A., Jørgensen, T. & West, C. W. (1998). A species-selective trawl for demersal gadoid fisheries. ICES Journal of Marine Science, 55, 835–845. https://doi.org/10.1006/jmsc.1998.0352
- Ferro, R. S. T., Jones, E. G., Kynoch, R. J., Fryer, R. J. & Buckett, B-E. (2007). Separating species using a horizontal panel in the Scottish North Sea whitefish trawl fishery. ICES Journal of Marine Science, 64, 1543–1550. https://doi.org/10.1093/icesjms/fsm099.
- Galbraith, R.D. & Main, J. (1989). Separator panels for dual purpose fish/prawn trawls. Scottish Fisheries Information Pamphlet Number 16 1989 ISSN 0309 9105. Department of Agriculture and Fisheries for Scotland.
- Galbraith, R.D. (1983). Further Investigation into Species Separation Using Multi level bottom, trawls. Department of Agriculture and Fisheries for Scotland Marine Laboratory. Working Paper No. 4/83.
- Hannah, R., W. & Jones, S.A. (2000). Bycatch reduction in an ocean shrimp trawl from a simple modification to the trawl footrope. Journal of the Northwest Atlantic Fishery Science., 27, 227-233. DOI: 10.2960/J.v27.a19.
- Hillis J.P. (1989). Further separator trawls experiment on Nephrops and whiting. ICES, CM 1989/B:46 Ref.K, Sess.P.
- Isaksen, B. & Valdemarsen J.W. (1986). Selectivity experiments with square mesh codends in bottom trawl. ICES C.M. B: 28, 18p.
- Karlsen, L. & Larsen, R. (1988). Progress in the Selective Shrimp Trawl Development in Norway. (Eds). In: Proceedings of the World Symposium on Fishing Gear and Fishing Vessel Design, November 1988. Marine Institute, St. John’s Newfoundland, Canada.
- Main, J. & Galbraith, R.D. (1990). A review of research into species separation with particular reference to Norway pouts (Trisepterus esmarkii). Scottish Fisheries Working Paper, No 14/90.
- Main, J. & Sangster, G. I. (1985a). Trawling experiments with a two level net to minimise the undersized gadoid by-catch in a Nephrops fishery. Fisheries Research, 3, 131–145.
- Main, J. & Sangster, G.I. (1985b). Recent studies in species separation with a two level trawl in three different fisheries. ICES, CM 1985/B:14 9pp.
- Main, J. & Sangster, G.I. (1986). Are separator trawls effective? Department of Agriculture and Fisheries for Scotland, Scottish Fisheries Bulletins, 49, 3-6 pp.
- O’Boyle, R. (2001). Meeting on Turtle By-catch in Canadian Atlantic Fisheries, Hayes Boardroom, BIO, Canadian Science Advisory Secreteriat, Preceding Series, 17, 32 p.
- Petrakis, G. & Stergiou, K.I. (1997). Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species, ICES Journal of Marine Science, 54, 13-23. DOI: 10.1006/jmsc.1996.0172.
- Poulsen, T.M. (1994). Development of species selective whiting trawls. ICES C.M 1994, B22 Ref.G.
- Reeves, S.A., Armstrong, D.W., Fryer, R.J. & Coull, K.A. (1992). The effects of mesh size, cod-end extension length and cod-end diameter on the selectivity of Scottish trawls and seines. ICES Journal of Marine Science, 49, 279–288. DOI: 10.1093/icesjms/49.3.279
- Renaud, M., Gitschlaq, G., Klima, E., Shah, A., Koi, D. & Nance, J. (1993). Loss of Shrimp by turtle excluder devices(TEDs) in coastal waters of the United States, North Carolina to Texas. Fishery Bulletin, 91, 129-137.
- Robertson, J.H.B. & Ferro, R.S.T. (1988). Mesh selection within the cod-end of trawls. The effects of narrowing the cod-end and shortening the extension. Scottish Fisheries Research, Report No 39.
- Stergiou, K.I., Petrakis, G. & Politou, C.Y. (1997). Size selectivity of diamond and square mesh cod-ends for Nephrops norvegicus in the Aegean Sea. Fisheries Research, 29, 203–209. https://doi.org/10.1016/S0165-7836(96)00542-5.
- Stewart, P.A.M. (2002). A review of studies of fishing gear selectivity in the Mediterranean. FAO COPEMED, 57 pp.
- Stone, M. & Bublitz, C.G. (1995). Cod trawl separator panel: potential for reducing halibut bycatch. Solving Bycatch:Considerations for Today and Tomorrow, Alaska Sea Grant College Program, Report No:96-03, University of Alaska Fairbanks. 71-78 pp.
- Thomsen, B., 1993. Selective flatfish trawling. ICES Marine Science Symposia, 196, 161-164.
- Tosunoğlu Z., Kaykaç, M.H. & Düzbastılar, F.O. (2002). Underwater observations and performance measurements of full-scale conventional and tailored demersal trawl nets (in Turkish). E.U. Faculty of Fisheries, Journal of Fisheries and Aquatic Sciences, 19, 209-219.
- Tosunoğlu, Z., Özbilgin, Y. D. & Özbilgin, H. (2003). Body shape and trawl codend selectivity for nine commercial fish species. Journal of the Marine Biological Association of the United Kingdom, 83, 1309–1313. https://doi.org/10.1017/S0025315403008737
- Valdemarsen, J.W. (1986). Radial escape section (RES) as sorting device in a shrimp trawl. FAO Expert Consultation, Mazatlan, Mexico, November, 24-28, 1986.
- Valdemarsen, J.W. (1996). A Review of Norwegian Research with Grid Sorting Devices in Towed Fishing Gears. ICES Study Group On Grid (Grate) Sorting Systems in Trawls, Beam Trawl and Seine Nets. Woods Hole, Massachusetts, USA, 61p.
- Wardle, C.S. (1995). A review of fish behaviour in relation to species separation and selectivity in mixed fisheries. ICES, CM 1995/B+G+H+J+K:3, Joint Session on Improving Selectivity in Mixed Species Fisheries.
- Watson, J.W., Workman, I.K., Foster, D., Taylor, C., Shah, A., Barbour, J. & Hataway, D. (1993). Status Report on the Development of Gear Modifications to Reduce Finfish By-Catch in Shrimp Trawls in The Southestern United States, 1990-1992, NMFS, Pascagula, MS, 130p.
- Wileman, D.A. (1994). Attempts to develop a species selective trawl for fishing pout. ICES C.M 1994.B:10 Ref.G.
Abstract
In this study, it was evaluated that the effectiveness of horizontal separator panel in the demersal trawl net. A modified trawl net, 900 fishing circle, divided into two separate panels as lower and upper panel from the beginning of trawl mouth. Experiments were carried out in the Gülbahçe Bay/İzmir/Turkey between 29.04.2013 – 08.05.2013 with R/V “EGESÜF”. Trawl hauls are standardized at 45 minutes. Lower (LB) and upper bag (UB), which have polyamide 20 mm mesh sizes, were constructed for obtained the species in lower and upper parts. After hauling up the gear, the catches from the LB and UB were emptied onto the deck separately, sorted by species, and weighed. In addition, total lengths were measure for red mullet (Mullus barbatus), annular sea bream (Dipldus annularis), Common pandora (Pagellus erythinus) and Blotched picarel (Spicara maena). T test was utilized for differences between LB and UB catches. The Kolmogorov–Smirnov (K–S) test was used to compare length distributions of the LB and UB specimens for red mullet, annular sea bream, common pandora and blotched picarel. A totally 21 hauls were performed. In total 790.1 kg belonging to 51 species was caught. As weight 80 % of species retained in LB and 20% in UB (P <0. 05). While most of red mullet (96%), annular sea bream (87%) and common Pandora (65 %) were caught in LB, Blotched picarel (69%) was obtained in UB. Further developments should be explored; with square mesh codend, sorting grid and multi selective system considering behaviour of species.
Keywords
Horizontal separator panel trawl net red mullet annular sea bream common pandora blotched picarel
References
- Anonymous (2016). Notification 4/1 Regulating Commercial Fishing (in Turkish). Republic of Turkey, Minister of Agriculture and Rural Affair, General Directorate of Conservation and Inspection, Ankara, 68 pp
- Aydın, C., Tosunoğlu, Z. & Tokaç, A. (2008). Sorting grid trials to improve size selectivity of red mullet (Mullus barbatus) and annular sea bream (Diplodus annularis) in Turkish bottom trawl fishery. Journal of Applied Ichthyology, 24: 306-310. DOI: 10.1111/j.1439-0426.2007.01052.x.
- Aydın, C., Aydın, İ. (2008). Deterimed fish species caught lower and upper part of tradiotional trawl codend (In Turkish). Journal of FisheriesSciences.com, 2, 367-374. DOI: 10.3153/jfscom.mug.200725
- Bailey, R.S., Galbraith, R.D., Hutcheon, J.R. & Walsh, M. (1983). Experimental fishing for Norway pout using a horizontally-divided trawl. ICES CM 1983/G:60.
- Campos, A. & Fonseca, P. (2004). The use of separator panels and square mesh windows for by-catch reduction in the crustacean trawl fishery off the Algarve (South Portugal). Fisheries Research, 69, 147–156. https://doi.org/10.1016/j.fishres.2004.05.009.
- Conolly, P.C. (1992). Bycatch activities in Brazil. Brazilian National Environment Institute, Southern Fisheries Research Centre, IBAMA, 43p.
- Engas, A., Jørgensen, T. & West, C. W. (1998). A species-selective trawl for demersal gadoid fisheries. ICES Journal of Marine Science, 55, 835–845. https://doi.org/10.1006/jmsc.1998.0352
- Ferro, R. S. T., Jones, E. G., Kynoch, R. J., Fryer, R. J. & Buckett, B-E. (2007). Separating species using a horizontal panel in the Scottish North Sea whitefish trawl fishery. ICES Journal of Marine Science, 64, 1543–1550. https://doi.org/10.1093/icesjms/fsm099.
- Galbraith, R.D. & Main, J. (1989). Separator panels for dual purpose fish/prawn trawls. Scottish Fisheries Information Pamphlet Number 16 1989 ISSN 0309 9105. Department of Agriculture and Fisheries for Scotland.
- Galbraith, R.D. (1983). Further Investigation into Species Separation Using Multi level bottom, trawls. Department of Agriculture and Fisheries for Scotland Marine Laboratory. Working Paper No. 4/83.
- Hannah, R., W. & Jones, S.A. (2000). Bycatch reduction in an ocean shrimp trawl from a simple modification to the trawl footrope. Journal of the Northwest Atlantic Fishery Science., 27, 227-233. DOI: 10.2960/J.v27.a19.
- Hillis J.P. (1989). Further separator trawls experiment on Nephrops and whiting. ICES, CM 1989/B:46 Ref.K, Sess.P.
- Isaksen, B. & Valdemarsen J.W. (1986). Selectivity experiments with square mesh codends in bottom trawl. ICES C.M. B: 28, 18p.
- Karlsen, L. & Larsen, R. (1988). Progress in the Selective Shrimp Trawl Development in Norway. (Eds). In: Proceedings of the World Symposium on Fishing Gear and Fishing Vessel Design, November 1988. Marine Institute, St. John’s Newfoundland, Canada.
- Main, J. & Galbraith, R.D. (1990). A review of research into species separation with particular reference to Norway pouts (Trisepterus esmarkii). Scottish Fisheries Working Paper, No 14/90.
- Main, J. & Sangster, G. I. (1985a). Trawling experiments with a two level net to minimise the undersized gadoid by-catch in a Nephrops fishery. Fisheries Research, 3, 131–145.
- Main, J. & Sangster, G.I. (1985b). Recent studies in species separation with a two level trawl in three different fisheries. ICES, CM 1985/B:14 9pp.
- Main, J. & Sangster, G.I. (1986). Are separator trawls effective? Department of Agriculture and Fisheries for Scotland, Scottish Fisheries Bulletins, 49, 3-6 pp.
- O’Boyle, R. (2001). Meeting on Turtle By-catch in Canadian Atlantic Fisheries, Hayes Boardroom, BIO, Canadian Science Advisory Secreteriat, Preceding Series, 17, 32 p.
- Petrakis, G. & Stergiou, K.I. (1997). Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species, ICES Journal of Marine Science, 54, 13-23. DOI: 10.1006/jmsc.1996.0172.
- Poulsen, T.M. (1994). Development of species selective whiting trawls. ICES C.M 1994, B22 Ref.G.
- Reeves, S.A., Armstrong, D.W., Fryer, R.J. & Coull, K.A. (1992). The effects of mesh size, cod-end extension length and cod-end diameter on the selectivity of Scottish trawls and seines. ICES Journal of Marine Science, 49, 279–288. DOI: 10.1093/icesjms/49.3.279
- Renaud, M., Gitschlaq, G., Klima, E., Shah, A., Koi, D. & Nance, J. (1993). Loss of Shrimp by turtle excluder devices(TEDs) in coastal waters of the United States, North Carolina to Texas. Fishery Bulletin, 91, 129-137.
- Robertson, J.H.B. & Ferro, R.S.T. (1988). Mesh selection within the cod-end of trawls. The effects of narrowing the cod-end and shortening the extension. Scottish Fisheries Research, Report No 39.
- Stergiou, K.I., Petrakis, G. & Politou, C.Y. (1997). Size selectivity of diamond and square mesh cod-ends for Nephrops norvegicus in the Aegean Sea. Fisheries Research, 29, 203–209. https://doi.org/10.1016/S0165-7836(96)00542-5.
- Stewart, P.A.M. (2002). A review of studies of fishing gear selectivity in the Mediterranean. FAO COPEMED, 57 pp.
- Stone, M. & Bublitz, C.G. (1995). Cod trawl separator panel: potential for reducing halibut bycatch. Solving Bycatch:Considerations for Today and Tomorrow, Alaska Sea Grant College Program, Report No:96-03, University of Alaska Fairbanks. 71-78 pp.
- Thomsen, B., 1993. Selective flatfish trawling. ICES Marine Science Symposia, 196, 161-164.
- Tosunoğlu Z., Kaykaç, M.H. & Düzbastılar, F.O. (2002). Underwater observations and performance measurements of full-scale conventional and tailored demersal trawl nets (in Turkish). E.U. Faculty of Fisheries, Journal of Fisheries and Aquatic Sciences, 19, 209-219.
- Tosunoğlu, Z., Özbilgin, Y. D. & Özbilgin, H. (2003). Body shape and trawl codend selectivity for nine commercial fish species. Journal of the Marine Biological Association of the United Kingdom, 83, 1309–1313. https://doi.org/10.1017/S0025315403008737
- Valdemarsen, J.W. (1986). Radial escape section (RES) as sorting device in a shrimp trawl. FAO Expert Consultation, Mazatlan, Mexico, November, 24-28, 1986.
- Valdemarsen, J.W. (1996). A Review of Norwegian Research with Grid Sorting Devices in Towed Fishing Gears. ICES Study Group On Grid (Grate) Sorting Systems in Trawls, Beam Trawl and Seine Nets. Woods Hole, Massachusetts, USA, 61p.
- Wardle, C.S. (1995). A review of fish behaviour in relation to species separation and selectivity in mixed fisheries. ICES, CM 1995/B+G+H+J+K:3, Joint Session on Improving Selectivity in Mixed Species Fisheries.
- Watson, J.W., Workman, I.K., Foster, D., Taylor, C., Shah, A., Barbour, J. & Hataway, D. (1993). Status Report on the Development of Gear Modifications to Reduce Finfish By-Catch in Shrimp Trawls in The Southestern United States, 1990-1992, NMFS, Pascagula, MS, 130p.
- Wileman, D.A. (1994). Attempts to develop a species selective trawl for fishing pout. ICES C.M 1994.B:10 Ref.G.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | March 15, 2019 |
| Submission Date | July 18, 2018 |
| Published in Issue | Year 2019Volume: 36 Issue: 1 |