Assessment of the relative catch performance of hake, red mullet and striped red mullet in a modified trawl extension with T90 netting




catch comparison, demersal trawl fisheries, T90 net, mesh size, Mediterranean Sea


We studied the relative catch performance of a modified trawl fitted with an extension piece using a 90º turned mesh (T90) in comparison with a standard trawl net used in NW Mediterranean bottom trawl fisheries employing a diamond mesh net. The comparison was made by means of paired experimental hauls using the same fishing vessel with alternate deployments of the standard net (control) and the experimental net. We used the catch comparison approach for three target species of the fishery: European hake, red mullet and striped red mullet. Our results show that the experimental net significantly reduces the catches of small-size hake and red mullet (though there was no discernible difference for striped red mullet), reducing unwanted catches of regulated species under the Landings Obligation. The overall catch rates of hake, pooled over all sizes, also increased by an estimated 50%, while the catch rates of red mullet and striped red mullet were significantly lower. However, considering all commercial species, the experimental net produced losses of commercial catch and income estimated at 17% and 18%, respectively, which may pose a barrier to the adoption of this relatively simple, inexpensive solution.


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Akaike H. 1974. A new look at the statistical model identification. IEEE Trans. Auto. Control 19: 716-722.

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

Bellido J.M., García-Rodríguez M., García-Jiménez T., et al. 2017. Could the obligation to land undersized individuals increase the black market for juveniles: evidence from the Mediterranean? Fish Fish. 18: 185-194.

Catchpole T.L., Revill A. S., Innes J., et al. 2008. Evaluating the efficacy of technical measures: a case study of selection device legislation in the UK Crangon crangon (brown shrimp) fishery. ICES J. Mar. Sci. 65: 267–275.

Deval M.C., Özgen G., Özbilgin H. 2016. Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean. J. Appl. Ichthyol. 32: 1041-1057.

Efron B. 1982. The jackknife, the bootstrap and other resampling plans. Society for Industrial and Applied Mathematics, CBMS-NSF Regional Conference Series in Applied Mathematics Monograph 38, Philadelphia. 85 pp.

European Commission (EC). 2006. European Council Regulation 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 of the European Union L, 409 pp.

European Commission (EC). 2012. Proposal for a regulation of the European Parliament and of the Council on the Common Fisheries Policy – general approach. Commission of the European Communities, Brussels 2012 11322/12.

European Commission (EC). 2013. European Council Regulation No 1380/2013 of the European Parliament and of the Council of 11 December 2013 on the Common Fisheries Policy, amending Council Regulations EC No 1954/2003 and EC No 1224/2009 and repealing Council Regulations EC No 2371/2002 and EC No 639/2004 and Council Decision 2004/585/EC. Official Journal of the European Union L, 354 pp.

Guijarro B., Massutí E. 2006. Selectivity of diamond- and square-mesh codends in the deepwater crustacean trawl fishery off the Balearic Islands western Mediterranean. ICES J. Mar. Sci. 63: 52-67.

Gullestad P., Blom G., Bakke G., et al. 2015. The "Discard Ban Package": Experiences in efforts to improve the exploitation patterns in Norwegian fisheries. Mar. Pol. 54: 1-9.

Hansen U.J. 2004. Performance of a trawl made from 90° turned netting (T90) compared with that of traditional codends. Gdynia: ICES Fishing Technology and Fish Behaviour Working Group Meeting.

Holst R., Revill A. 2009. A simple statistical method for catch comparison studies. Fish. Res. 95: 254-259.

Krag L.A., Herrmann B., Karlsen J.D. 2014. Inferring fish escape behaviour in trawls based on catch comparison data: model development and evaluation based on data from Skagerrak, Denmark. PLoS ONE 9: e88819.

Madsen N., Herrmann B., Frandsen R.P., et al. 2012. Comparing selectivity of a standard and turned mesh T90 codend during towing and haul-back. Aquat. Living Res., 25: 231-240.

Martinet V., Thébaud O., Doyen L. 2007. Defining viable recovery paths toward sustainable fisheries. Ecol. Econ. 64: 411-422.

Merino G., Quetglas A., Maynou F., et al. 2015. Improving the performance of a Mediterranean demersal fishery toward economic objectives beyond MSY. Fish. Res. 161: 131-144.

Moderhak W., Dahm E., Winbeck H., et al. 1999. Determination of selectivity of cod codends made of netting turned through 90°. Bull. Sea Fish. Inst. Gdynia 1140: 3-14.

Sala A., Lucchetti A. 2011. Effect of mesh size and codend circumference on selectivity in the Mediterranean demersal trawl fisheries. Fish. Res. 110: 252-258.

Sartor P., Carbonara P., Luchetti A., et al. 2016. Indagine cognoscitiva sullo scarto della pesca alle specie demersali nei mari italiani. Sintesi del Progetto Coordinato. Project Final Report, Italian Ministry for Agriculture, Food and Forest Policies. Quaderni Nisea n. 1, 40 pp.

Sistiaga M., Herrmann B., Grimaldo E., et al. 2015. Effect of lifting the sweeps on bottom trawling catch efficiency: A study based on the Northeast arctic cod (Gadus morhua) trawl fishery. Fish. Res.167: 164-173.

Tsagarakis K., Palialexis A., Vassilopoulou V. 2014. Mediterranean fishery discards: Review of the existing knowledge. ICES J. Mar. Sci. 71: 1219-1234.

Uhlmann S.S., Van Helmond A.T.M., Kemp Stefánsdóttir E., et al. 2014. Discarded fish in European waters: General patterns and contrasts. ICES J. Mar. Sci. 71: 1235-1245.

Wienbeck H., Herrmann B., Moderhak W., et al. 2011. Effect of netting direction and number of meshes around on size selection in the codend for Baltic cod Gadus morhua. Fish. Res.109: 80-88.



How to Cite

Sola I, Maynou F. Assessment of the relative catch performance of hake, red mullet and striped red mullet in a modified trawl extension with T90 netting. scimar [Internet]. 2018Dec.30 [cited 2020Dec.1];82(S1):19-26. Available from:




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