Size selectivity of sorting grid for eight fish species in the Gulf of Antalya, Northeastern Mediterranean Sea



Selectivity of sorting grid for eight fish species were studied under commercial conditions in the trawl fishery of Antalya Bay, in the eastern Mediterranean Sea. Trawling’s were operated from October to December 2012, using a traditional bottom trawl net. The fish totally retained in upper codend (catchees), and bottom codend (escapes) were used to estimate the selectivity parameters. Selectivity data analyzed as covered codend method by means of a logit function of Maximum Likelihood Method. The Kolmogorov-Smirnov test was applied in order to determine the difference between size groups of escapes and catchees codends. Fifty percent retention lengths (L50) of Spicara flexuosa (Picarel), Boops boops (Bogue), Mullus surmuletus (Surmullet), Mullus barbatus barbatus (Red mullet), Upeneus moluccensis (Goldband goatfish), Trachurus mediterraneus (Mediterranean horse mackerel) Trachurus picturatus (blue jack mackerel) and Saurida undosquamis (Brushtooth lizardfish) were calculated as 13.31; 13.47; 15.58; 12.07; 13.52; 18.49; 17.81 and 20.3cm, respectively. Results showed that sorting grid installed trawl nets provided high selectivity for all fish species


Multi species, Selectivity method, Bottom trawl fishery.

Full Text:



Aydın, C.; Tokaç, A. & Tosunoğlu, Z. 2007. Selectivity of sorting grid with horizontal bar for Hake (Merluccius merluccius), Red mullet (Mullus barbatus) and Annular Sea bream (Diplodus annularis). Journal of Fisheries Faculty of Ege University, 24: 39-43. (In Turkish)

Aydın, C. & Tosunoğlu, Z. 2010. Selectivity of diamond, square and hexagonal mesh codends for Atlantic horse mackerel Trachurus trachurus, European hake Merluccius merluccius, and Greater forkbeard Phycis blennoides in the eastern Mediterranean. Journal of Applied Ichthyology 26: 71-77.

Bilge, G. 2008. The bio-ecological characteristics of Bogue (Boops boops L., 1758) in the Aegean Sea. PhD Thesis, Fisheries Department, Ege University, İzmir, Turkey. (In Turkish)

Bahamon, N.; Sarda, F. & Suuronen, P. 2007. Selectivity of flexible size sorting grid in Mediterranean multispecies trawl fishery. Fisheries Research 73: 1231-1240.

Çiçek, E. 2015. Bottom trawls selectivity parameters of four fish species from Karataş coasts of Turkey in Northeastern Mediterranean Waters. Journal of Applied Ichthyology 2: 79-86.

Demirel, N. & Yüksek, A. 2013. Reproductive biology of Trachurus mediterraneus (Carangidae) a detailed study for the Marmara-Black Sea stock. Journal of the Marine Biological Association of the United Kingdom 93: 357-364.

EC., 2006. Council Regulation (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 Journal, L 409, 30/12/2006, 0011-0085.

Ercoli, R.; Salvini, L.; García, J.; Izzo, A.; Roth, R. & Bartozzetti, J. 2000. Manual técnico del dispositivo para el escape de juveniles de peces en lasredes de arrastre (DEJUPA) aplicado a la merluza (Merluccius hubbsi). INIDEP Informe Técnico 39: 1-7.

Figuerola, P.; Sánchez, P. & Demestre, M. 2001. Preliminary results on megafauna variations due to experimental trawl disturbance. Commission Internationale Pour L’Exploration Scientifique de la mer Mediterranee 36: 265

Isaksen, B.; Valdemarsen, J.W.; Larsen, R.B. & Karlsen, L. 1992. Reduction of fish by catch in shrimp trawls using a rigid separator grid in the aft belly. Fisheries Research 13: 335-352.

Jurado-Ruzafa, A. & García Santamaría, M.T. 2013. Reproductive biology of the Blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off the Canary Islands. Journal of Applied Ichthyology 29(3): 526-531.

Machias, A.; Vassilopoulou, V.; Vatsos, D.; Bekas, P.; Kallianiotis, A.; Papaconstantinou, C. & Tsimenides, N. 2001. Bottom trawl discards in the Northeastern Mediterranean Sea. Fisheries Research 53: 181-195.

Massuti, E.; Ordines, F. & Guijarro, B. 2009. Efficiency of flexible sorting grids to improve size selectivity of the bottom trawl in the Balearic Islands (western Mediterranean), with comparison to a change in mesh codend geometry. Journal of Applied Ichthyology 25: 153-161.

Özyurt, C.E. 2003. The determination of mesh size for some commercially important demersal fish species captured by deep trawl net at Babadıl limanı Bight (Silifke-Mersin). Phd Thesis, Fisheries Department. Çukurova University, Adana, Turkey. (In Turkish)

Sacchi, J. 2008. The use of trawling nets in the Mediterranean. Problems and selectivity options. In: Basurco, B. (ed.). The Mediterranean fisheries sector. A reference publication for the VII meeting of Ministers of agriculture and fisheries of CIHEAM member countries (Zaragoza, Spain, 4 February 2008). Zaragoza: CIHEAM/FAO/ GFCM, pp. 87-96.

Sarda, F.; Moli, B. & Palomera, I. 2004. Preservation of juvenile hake (Merluccius merluccius L.) in the western Mediterranean demersal trawl fishery by using sorting grids. Scientia Marina 68: 435-444.

Sarda, F.; Bahamon, N.; Palomera, F.S. & Moli, B. 2005. Commercial testing of a sorting grid to reduce of juvenile hake (Merluccius merluccius L.) in the western Mediterranean demersal trawl fishery. Aquatic Living Resources 18: 87-91.

Sarda, F.; Bahamon, N.; Moli, B. & Palomera, F.S. 2006. The use of a square mesh codend and sorting grids to reduce catches of young fish and improve sustainability in a multispecies bottom trawl fishery in the Mediterranean. Scientia Marina 70: 347-353.

Smith-Vaniz, W.F.; Quéro, J.C. & Desoutter, M. 1990. Carangidae. In: Quero, J.C.; Hureau, J.C.; Karrer, C.; Post A. & Saldanha, L. (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). Vol. 2. JNICT, Lisbon; SEI, Paris; and UNESCO, Paris. pp. 729-755.

Suuronen, P. 1995. Conservation of young fish by management of trawl selectivity. Finnish Fisheries Research 15: 97-116.

Suuronen, P.; Peres-Comaz, J.A.; Lehtonen, E. & Tschernij, V. 1996. Size related survival of Baltic herring (Clupea harengus) escaping through a rigid sorting grid and trawl codend meshes. ICES Journal of Marine Science 53: 691-700.

TFR, 2012. Notification 3/1 Regulating Commercial Fishing (in Turkish). SUR-KOOP, Ankara, 112 p.

Wileman, D.A.; Ferro, R.S.T.; Fonteyne, R. & Millar, R.B. 1996. Manual of methods of measuring the selectivity of towed fishing gears. ICES Cooperative Research Report, No. 215, 216 p.


  • There are currently no refbacks.