Scientia Marina, Vol 82, No 3 (2018)

The influence of mesh size and shape on the size selection of European hake (Merluccius merluccius) in demersal trawl codends: An investigation based on fish morphology and simulation of mesh geometry


https://doi.org/10.3989/scimar.04764.18A

Adnan Tokaç
Ege University, Turkey
orcid http://orcid.org/0000-0002-2968-7315

Bent Herrmann
SINTEF Ocean, Fishing Gear Technology - Norwegian College of Fishery and Aquatic Science, University of Tromsø, Norway
orcid http://orcid.org/0000-0003-1325-6198

Gökhan Gökçe
Çukurova University, Turkey
orcid http://orcid.org/0000-0003-1830-0733

Ludvig Ahm Krag
DTU Aqua, Technical University of Denmark, Denmark
orcid http://orcid.org/0000-0002-1531-1499

Davud Sadegh Nezhad
Ege University, Turkey
orcid http://orcid.org/0000-0003-3725-9705

Abstract


European hake (Merluccius merluccius) is an important commercial species for several European bottom trawl fisheries. Therefore, understanding the influence of codend mesh size and shape on the size selection of European hake is critical for defining technical measures for fisheries targeting this species. Based on morphology data collected on European hake, the influence of mesh size and shape on bottom trawl codend size selectivity was investigated by simulation using the FISHSELECT methodology successfully applied previously for other species. The predicted size selection for European hake was found to agree well with previous experimental results for a wide range of mesh sizes if it was assumed that the codend meshes had a relatively small opening angle, between 20° and 40°, during trawling. This study enables detailed prediction of size selectivity for European hake and offers a potential explanation for previous experimental size selectivity results.

Keywords


European hake; trawl codend; size selectivity; fish morphology; mesh geometry; Mediterranean Sea

Full Text:


HTML PDF XML

References


Akaike H. 1974. A new look at the statistical model identification. IEEE Trans.Autom. Control 19: 716-723. https://doi.org/10.1109/TAC.1974.1100705

Alzorriz N., Arregi L., Herrmann B., et al. 2016. Questioning the effectiveness of technical measures implemented by the Basque bottom otter trawl fleet: Implications under the EU landing obligation. Fish. Res. 175: 116-126. https://doi.org/10.1016/j.fishres.2015.11.023

Aydın C., Tosuno?lu Z. 2010. Selectivity of diamond, square and hexagonal mesh codends for Atlantic horse mackerel Trachurus trachurus, European hake Merluccius merluccius, and greater fork beard Phycis blennoides in the eastern Mediterranean. J. Appl. Ichthyol. 26: 71-77. https://doi.org/10.1111/j.1439-0426.2009.01376.x

Bahamon N., Sardá 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. https://doi.org/10.1016/j.fishres.2006.05.020

Bensch A., Gianni M., Gréboval D., et al. 2009. Worldwide review of bottom fisheries in the high seas. FAO Fish. Tech. Pap. No. 522, Rev.1. Rome, 145 pp. PMCid:PMC2670628

Campos A., Fonseca P. 2003. Selectivity of diamond and square mesh cod ends for horse mackerel (Trachurus trachurus), European hake (Merluccius merluccius) and axillary seabream (Pagellus acarne) in the shallow groundfish assemblage off the south-west coast of Portugal. Sci. Mar. 67: 249-260. https://doi.org/10.3989/scimar.2003.67n2249

Campos A., Fonseca P., Erzini K. 2003a. Size selectivity of diamond and square mesh cod ends for four by-catch species in the crustacean fishery off the Portuguese south coast. Fish. Res. 60: 79-97. https://doi.org/10.1016/S0165-7836(02)00061-9

Campos A., Fonseca P., Henriques V. 2003b. Size selectivity for four fish species of the deep groundfish assemblage off the Portuguese southwest coast: evidence of mesh size, mesh configuration and cod end catch effects. Fish. Res. 63: 213-233. https://doi.org/10.1016/S0165-7836(03)00060-2

Casey J., Pereiro J. 1995. European hake (M. merluccius) in the north-east Atlantic. In: Alheit J., Pitcher T.J. (eds), Hake: Fisheries, Ecology and Markets. Chapman and Hall, London, pp. 125-148. https://doi.org/10.1007/978-94-011-1300-7_5

Cohen D, Tadashi I., Tomio I., et al. 1990. Gadiform fishes of the world. FAO Fisheries Synopsis, 125. FAO, Rome. 442 pp.

European Commision (EC). 1998. Council regulation (EC) No. 850/98 of 30 March 1998 for the conservation of fishery resources through technical measures for the protection of juveniles of marine organisms. OJL. 125: 52 pp.

European Commision (EC). 2004. Council regulation (EC) No. 811/2004 of 21 April 2004 establishing measures for the recovery of the northern hake stock. OJL. 150: 1-11.

European Commision (EC). 2006a. Council Regulation (EC) No. 51/2006 of 22 December 2005 fixing for 2006 the fishing opportunities and associated conditions for certain fish stocks and groups of fish stocks, applicable in Community waters and, for Community vessels, in waters where catch limitations are required. OJL. 16: 148-149.

European Commision (EC). 2006b. 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. OJL. 409: 11-85.

FAO. 2018. Fishery and Aquaculture Statistics. Global capture production 1950-2016 (FishstatJ). Rome. Online.

Frandsen R.P., Holst R., Madsen N. 2009. Evaluation of three levels of selective devices relevant to management of the Danish Kattegat-Skagerrak Nephrops fishery. Fish. Res. 97: 243-252. https://doi.org/10.1016/j.fishres.2009.02.010

Herrmann B. 2005a. Effect of catch size and shape on the selectivity of diamond mesh cod-ends. I. Model development. Fish. Res. 71: 1-13. https://doi.org/10.1016/j.fishres.2004.08.024

Herrmann B. 2005b. Effect of catch size and shape on the selectivity of diamond mesh cod-ends. II. Theoretical study of haddock selection. Fish. Res. 71: 15-26. https://doi.org/10.1016/j.fishres.2004.08.021

Herrmann B., Priour D., Krag L.A. 2006. Theoretical study of the effect of roundstraps on the selectivity in a diamond mesh cod-end. Fish. Res. 80: 148-157. https://doi.org/10.1016/j.fishres.2006.04.018

Herrmann B., Priour D., Krag L.A. 2007. Simulation-based study of the combined effect on codend size selection for round fish of turning mesh 90 degree and of reducing the number of meshes in the circumference. Fish. Res. 84: 222-232. https://doi.org/10.1016/j.fishres.2006.10.020

Herrmann B., Krag L.A., Frandsen R.P., et al. 2009. Prediction of selectivity from morphological conditions: methodology and a case study on cod (Gadus morhua). Fish. Res. 97: 59-71. https://doi.org/10.1016/j.fishres.2009.01.002

Herrmann B., Sistiaga M., Nielsen K.N., et al. 2012. Understanding the size selectivity of redfish (Sebastes spp.) in North Atlantic trawl codends. J. Northwest Atl. Fish. Sci. 44: 1-13. https://doi.org/10.2960/J.v44.m680

Krag L.A., Herrmann B., Madsen N., et al. 2011. Size selection of haddock (Melanogrammus aeglefinus) in square mesh codends: a study based on assessment of decisive morphology for mesh penetration. Fish. Res. 110: 225-235. https://doi.org/10.1016/j.fishres.2011.03.009

Lucchetti A. 2008. Comparison of diamond- and square-mesh codends in the hake (Merluccius merluccius L. 1758) trawl fishery of the Adriatic Sea (central Mediterranean). Sci. Mar. 72: 451-460.

O'Neill F.G., Kynoch R.J., Blackadder L., et al. 2016. The influence of twine tenacity, thickness and bending stiffness on codend selectivity. Fish. Res. 176: 94-99. https://doi.org/10.1016/j.fishres.2015.12.012

Ordines F., Massutí E., Guijarro B., et al. 2006. Diamond vs. square-mesh codend in a multi-species trawl fishery of the western Mediterranean: effects on catch composition, yield, size selectivity and discards. Aquat. Living Resour. 19: 329-338. https://doi.org/10.1051/alr:2007003

Özbilgin H., Tokaç A., Kaykaç M.H. 2012. Selectivity of commercial compared to larger mesh and square mesh trawl codends for four fish species in the Aegean Sea. J. Appl. Ichthyol. 28: 51-59. https://doi.org/10.1111/j.1439-0426.2011.01916.x

Recasens L., Lombarte A., Morales-Nin B., et al. 1998. Spatiotemporal variations in the population structure of the European hake in the northwestern Mediterranean. J. Fish Biol. 53: 387-401. https://doi.org/10.1111/j.1095-8649.1998.tb00988.x

Robertson J.H.B. 1986. Design and construction of square mesh cod-ends. Scottish Fish. Inf. Pamph. No. 12. Aberdeen. 10 pp.

Sala A., Lucchetti A. 2010. The effect of mesh configuration and codend circumference on selectivity in the Mediterranean trawl Nephrops fishery. Fish. Res. 103: 63-72. https://doi.org/10.1016/j.fishres.2010.02.003

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. https://doi.org/10.1016/j.fishres.2011.04.012

Sala A., Priour D., Herrmann B. 2006. Experimental and theoretical study of red mullet (Mullus barbatus) selection in codends of Mediterranean bottoms trawls. Aquat. Living Resour. 19: 317-327. https://doi.org/10.1051/alr:2007002

Sala A., Lucchetti A., Buglioni G. 2007. The influence of twine thickness on the size selectivity of polyamide codends in a Mediterranean bottom trawl. Fish. Res. 83: 192-203. https://doi.org/10.1016/j.fishres.2006.09.013

Sala A, Herrmann B, De Carlo F., et al. 2016. Effect of codend circumference on the size selection of square-mesh codends in trawl fisheries. PLoS One. 11: e0160354. https://doi.org/10.1371/journal.pone.0160354 PMid:27472058 PMCid:PMC4966963

Sistiaga M., Herrmann B., Nielsen K.N., et al. 2011. Understanding limits tocod and haddock separation using size selectivity in a multi-species trawlfishery: an application of FISHSELECT. Can. J. Fish. Aquat. Sci. 68: 927-940. https://doi.org/10.1139/f2011-017

Tokaç A., Özbilgin H., Kaykaç H. 2010. Selectivity of conventional and alternative codend design for five fish species in the Aegean Sea. J. Appl. Ichthyol. 26: 403-409. https://doi.org/10.1111/j.1439-0426.2009.01379.x

Tokaç A., Herrmann B., Gökçe G., et al. 2016. Understanding the size selectivity of red mullet (Mullus barbatus) in Mediterranean trawl codends: A study based on fish morphology. Fish. Res. 174: 81-93. https://doi.org/10.1016/j.fishres.2015.09.002

Tosuno?lu Z., Aydın C., Özaydın O. 2008. Selectivity of a 50-mm diamond mesh knotless polyethylene codend for commercially important fish species in the Aegean Sea. J. Appl. Ichthyol. 24: 311-315.

Turkish Fisheries Regulation (TFR). 2016. Turkish Fisheries Regulation (TFR) No. 4/1-2016 concerning commercial fish catching regulations in 2016-2020 fishing period. Beyda Ofset. Ankara, 112 pp. (in Turkish).

Wileman D.A., Ferro R.S.T., Fonteyne R., et al. 1996. Manual of methods of measuring the selectivity of towed fishing gears. ICES Coop. Res. Rep. No. 215. 126 pp. PMid:8970959 PMCid:PMC190927




Copyright (c) 2018 Consejo Superior de Investigaciones Científicas (CSIC)

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


Contact us scimar@icm.csic.es

Technical support soporte.tecnico.revistas@csic.es