Scientia Marina, Vol 73, No 3 (2009)

Selectivity of commercial, larger mesh and square mesh trawl codends for deep water rose shrimp Parapenaeus longirostris (Lucas, 1846) in the Aegean Sea

Hakan Kaykaç
Fisheries Faculty, Ege University, Turkey

Adnan Tokaç
Fisheries Faculty, Ege University, Turkey

Hüseyin Özbilgin
Mersin University, Fisheries Faculty, Turkey


We investigated the differences between size selectivity of a commercial codend (40 mm diamond mesh – 40D), a larger mesh codend (48 mm diamond mesh – 48D), and a square mesh codend (40 mm square mesh – 40S) for Parapenaeus longirostris in international waters of the Aegean Sea. Selectivity data were collected by using a covered codend method and analysed taking between-haul variation into account. The results indicate significant increases in L50 values in relation to an increase in mesh size and when the square mesh is used in the commercial trawl codend. The results demonstrate that the commercially used codend (40D) is not selective enough for P. longirostris in terms of length at first maturity. Changing from a 40D to a 48D codend significantly improves selection, with an increase of about 15% in the L50 values (carapace length 14.5 mm for 40D and 16.6 mm for 48D). Similarly, 40 mm square mesh, which has recently been legislated for EU Mediterranean waters, showed a 12.4% higher mean L50 value (16.3 mm) than 40 mm diamond mesh for this species. However, despite these improvements, the 48D and 40S codends still need further improvements to obtain higher selectivity closer to the length at first maturity (20 mm carapace length).


Parapenaeus longirostris; mesh size; mesh shape; diamond mesh; square mesh

Full Text:



Abelló, P., A. Abella, A. Adamidou, S. Jukic-Peladic, P. Maiorano and M.T. Spedicato. – 2002. Geographical patterns in abundance and population structure of Nephrops norvegicus and Parapenaeus longirostris (Crustacea: Decapoda) along the European Mediterranean coasts. Sci. Mar., 66(2): 125-141. doi:10.3989/scimar.2002.66s2125

Anonymous. – 2008. 2/1 numaralı ticari su ürünleri avcılıg%ını düzenleyen teblig% (Teblig% no: 2008/48). Tarım ve Köyisxleri Bakanlıg%ı, Koruma ve Kontrol Genel Müdürlüg%ü, Ankara.

Aydın, C. and Z. Tosunog%lu. – 2009. Selectivity of square and hexagonal mesh codends for the deep water rose shrimp, Parapenaeus longirostris (Lucas, 1846) (Decapoda, Penaeidae) in the Aegean Sea. Crustac. Int. J. Crustac. Res.

Bahamon, N., F. Sardà and P. Suuronen. – 2006. Improvement of trawl selectivity in the NW Mediterranean demersal fishery by using a 40 mm square mesh codend. Fish. Res., 81: 15-25. doi:10.1016/j.fishres.2006.05.020

Campos, A., P. Fonseca and K. Erzini. – 2002. Size selectivity of diamond and square mesh cod ends for rose shrimp (Parapenaeus longirostris) and Norway lobster (Nephrops norvegicus) off the Portuguese south coast. Fish. Res., 58: 281-301. doi:10.1016/S0165-7836(01)00396-4

ConStat. – 1995. CC selectivity. (Granspaettevej 10, DK-9800 Hjjlarring, Denmark).

Council Regulation. – 2006. (EC) No 1967/2006 of 21 December 2006, concerning management measures for the sustainable exploitation of fishery resources in the Mediterranean Sea, amending Regulation (EEC) No 2847/93 and repealing Regulation (EC) No 1626/94. Official J. Eur. Union L. 409.

Deval, M.C., T. Bök, C. Atesx and H. Özbilgin. – 2006. Selectivity of PE and PA material codends for rose shrimp (Parapenaeus longirostris) in Turkish twin rigged beam trawl fishery. Fish. Res., 81: 72-79. doi:10.1016/j.fishres.2006.05.007

Fryer, R.J. – 1991. A model of between-haul variation in selectivity. ICES J. Mar. Sci., 48: 281-290. doi:10.1093/icesjms/48.3.281

Fryer, R.J., Shepherd, J.G., 1996. Models of codend size selection. J.Northwest Atl. Fish. Sci. 19: 91–102 doi:10.2960/J.v19.a5

GFCM. – 2007. FAO Report of the tenth session of the Scientific Advisory Committee, Nicosia, Cyprus, 22-26 October 2007. Fish. Rep. 856: 1-157.

Guijarro, B. and E. Massutí. – 2006. Selectivity of diamond- and square-mesh codends in the deepwater crustacean trawl fishery off the Balearic Island (western Mediterranean). ICES J. Mar. Sci., 63: 52–67. doi:10.1016/j.icesjms.2005.08.011

Holthuis, L.B. – 1980. FAO species catalogue, 1. Shrimps and prawns of the world. An annotated catalogue of species of interest to fisheries. FAO Fish. Synop., 125: 1-261.

Meriem, S.B., R. Fehri-Bedoui and H. Gharbi. – 2001. Size at maturity and ovigerous period of the pink shrimp Parapenaeus longirostris (Lucas, 1846) in Tunisia. Crustac. Int. J. Crustac. Res., 74: 39-48.

Özbilgin, H., Z. Tosunog%lu, C. Aydın, H. Kaykaç and A. Tokaç. – 2005. Selectivity of Standard, Narrow and Square Mesh Panel Trawl Codends for Hake (Merluccius merluccius) and Poor Cod (Trisopterus minutus capelanus). Turk. J. Vet. Anim. Sci., 29: 967-973.

Petrakis, G. and K.I. Stergiou. – 1997. Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species. ICES J. Mar. Sci., 54: 13-23. doi:10.1006/jmsc.1996.0172

Ragonese S. and M.L. Bianchini. – 2006. Trawl selectivity trials on the deep-water rose shrimp (Parapenaeus longirostris) in Sicilian waters. In: M. Thessalou-Legaki (ed.), Issues of Decapod Crustacean Biology. Hydrobiologia, 557: 113-119.

Reeves S.A., D.W. Armstrong, R.J. Fryer and K.A. Coull. – 1992. The effects of mesh size, cod-end extension length and cod-end diameter on the selectivity of Scottish trawls and seines. ICES J. Mar. Sci., 49: 279-288. doi:10.1093/icesjms/49.3.279

Relini, G., J. Bertrand and A. Zamboni. – 1999. Synthesis of the knowledge on bottom fishery resources in Central Mediterranean. Biol. Mar. Medit. 6(Suppl. 1): 1-868.

Rinelli, P., D. Giordano, F. Perdichizzi, S. Greco and S. Ragonese. – 2005. Trawl gear selectivity on the deep-water rose shrimp (Parapenaeus longirostris, Lucas, 1846) in the southern Tyrrhenian Sea (central Mediterranean). Cah. Biol. mar., 46: 1-7.

Robertson, J.H.B. and R.S.T Ferro. – 1988. Mesh selection within the cod-end of trawls. The effects of narrowing the cod-end and shortening the extension. Scot. Fish. Res. Report No 39: 11.

Robertson, J.H.B. and P.A.M. Stewart. – 1988. A comparison of size selection of haddock and whiting by square and diamond mesh codends. J. Cons. Explor. Mer., 44: 148-161.

Sala, A., A. Luchetti, C. Piccinetti and M. Ferretti. – 2008. Size selection by diamond- and square-mesh codends in multi-species Mediterranean demersal trawl fisheries. Fish. Res., 93: 8-21. doi:10.1016/j.fishres.2008.02.003

Sobrino, I., G. Teresa and J. Baro. – 2000. Trawl gear selectivity and the effect of mesh size on the deep-water rose shrimp (Parapenaeus longirostris Lucas, 1846) fishery off the Gulf of Cádiz (SW Spain). Fish. Res., 44: 235-245. doi:10.1016/S0165-7836(99)00090-9

Sobrino, I., C. Silva, M. Sbrana and K. Kapiris. – 2005. A review of the biology and fisheries of the deep water rose shrimp, Parapenaeus longirostris, in European Atlantic and Mediterranean waters (Decapoda, Dendrobranchiata, Penaeidae). Crustac. Int. J. Crustac. Res., 78: 1153–1184.

Stergiou, K.I., G. Petrakis and C.-Y. Politou. – 1997. Size selectivity of diamond and square mesh codends for Nephrops norvegicus in the Aegean Sea. Fish. Res., 29: 203-209. doi:10.1016/S0165-7836(96)00542-5

Tokaç, A., A. Lök, Z. Tosunog%lu, C. Metin and R.S.T. Ferro. – 1998. Codend selectivities of a modified bottom trawl for three fish species in the Aegean Sea. Fish. Res., 39: 17-31. doi:10.1016/S0165-7836(98)00172-6

Tokaç, A., H. Özbilgin and Z. Tosunog%lu. – 2004. Effect of PA and PE material on codend selectivity in Turkish bottom trawl. Fish. Res., 67: 317-327. doi:10.1016/j.fishres.2003.10.001

Tokaç, A., Z. Tosunog%lu, G. Gökçe, H. Kaykaç and H. Özbilgin. – 2005. Technical drawing and specifications of 900 mesh traditional bottom trawl net in Turkish demersal fisheries. J. Fish. Aquat. Sci., 22: 439-442.

Tokaç, A., H. Özbilgin and H. Kaykaç. – 2009. Alternative codend designs to improve size selectivity for Norway lobster (Nephrops norvegicus) and Rose shrimp (Parapenaeus longirostris) in the Aegean Sea. Crustac. Int. J. Crustac. Res., 82: 689-702.

Tom, M., M. Gorem and M. Ovadia. – 1988. The benthic phases of life cycle of Parapenaeus longirostris (Crustacea, Decapoda, Penaeidae) along the Mediterranean coast of Israel. Hydrobiologia, 169: 339-352. doi:10.1007/BF00007557

Tosunog%lu, Z., C. Aydın, O. Özaydın and S. Leblebici. – 2007. Trawl codend mesh selectivity of braided PE materıal for Parapenaeus longirostris (Lucas, 1846) (Decapoda, Penaeidae). Crustac. Int. J. Crustac. Res., 80: 1087-1094.

Wileman, D.A., R.S.T. Ferro, R. Fonteyne and R.B. Millar (eds.). – 1996. Manual of Methods of Measuring the Selectivity of Towed Fishing Gears. ICES Coop. Res. Rep. No., 215. (Copenhagen).

Copyright (c) 2009 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Contact us

Technical support