Hostname: page-component-7c8c6479df-ph5wq Total loading time: 0 Render date: 2024-03-29T09:13:20.926Z Has data issue: false hasContentIssue false

Experimental and theoretical study of red mullet (Mullus barbatus) selectivity in codends of Mediterranean bottom trawls

Published online by Cambridge University Press:  07 February 2007

Antonello Sala
Affiliation:
Consiglio Nazionale Delle Ricerche (CNR), Istituto di Scienze Marine (ISMAR), Sede di Ancona, Largo Fiera della Pesca, 60125 Ancona, Italy
Daniel Priour
Affiliation:
IFREMER, BP 70, 29280 Plouzane Cedex, France
Bent Herrmann
Affiliation:
DIFRES, Danish Institute for Fisheries Research, North Sea Centre, 9850 Hirtshals, Denmark
Get access

Abstract

The objective of this study was to investigate the effect on Mullus barbatus (red mullet) codend selectivity by increasing the codend mesh size or reducing the number of meshes in the codend circumference. This was performed through experimental sea trials and computer simulations. The sea trials were carried out in the Adriatic Sea using a polyamide codend in order to assess its selectivity, to record morphological (height, width and length) and population size structure parameters of red mullet (Mullus barbatus). The selectivity process in the codend was also simulated with an individual-based model (PRESEMO) and a finite element model (FEMNET) to calculate the codend shapes. By adjusting the behavioural description of red mullet in the simulation, the model results reached an agreement with the experimental results. Next these, behavioural parameters were used in the simulation model to predict the effect of changing mesh size and number of meshes around in new codend designs. The predicted effect and the benefit of enforcing these designs on catch efficiency below and above minimum landing size (MLS) were investigated. The results confirm that the reduction of number of meshes in the codend circumference will be more beneficial than increasing the mesh size.

Type
Research Article
Copyright
© EDP Sciences, IFREMER, IRD, 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bessonneau J.S., Marichal, D., 1998, Study of the dynamics of submerged supple nets (applications to trawls) Ocean Eng. 25, 563–583.
ConStat, 1995, CC selectivity. Groenspaettevej 10, DK-9800 Hjoerring, Denmark.
Dremière, P.Y., Fiorentini, L., Cosimi, G., Leonori, I., Sala, A., Spagnolo, A., 1999, Escapement from the main body of the bottom trawl used for the Mediterranean International Trawl Survey (MEDITS). Aquat. Living Resour. 12, 207217. CrossRef
EC-1626, 2004, Council Regulation (EC) laying down certain technical measures for the conservation of fishery resources in the Mediterranean. Official Journal L. 171, 6. PubMed
EN ISO 1107, 2003, Fishing nets – Netting – Basic terms and definitions.
Ferretti, M., Froglia, C., 1975, Result of selectivity experiments made with different trawls, on more important Adriatic demersal fish. Quad. Lab. Tecnol. Pesca 2, 116.
Fryer, R.J., 1991, A model of between-haul variation in selectivity. ICES J. Mar. Sci. 48, 281290. CrossRef
Galbraith, R.D., Fryer, R.J., Maitland, K.M.S., 1994, Demersal pair trawl codend selectivity models. Fish. Res. 20, 1327. CrossRef
Herrmann, B., 2005a, Effect of catch size and shape on the selectivity of diamond mesh codends. I. Model development. Fish. Res. 71, 113.
Herrmann B., 2005b, Modelling and simulation of size selectivity in diamond mesh trawl cod-ends. Ph.D. Thesis. Aalborg University, Denmark. ISBN 87-91200-50-4.
Herrmann, B., O'Neill, F.G., 2005, Theoretical study of the between haul variation of haddock selectivity in a diamond mesh codend. Fish. Res. 74, 243252. CrossRef
Jukic, S., Piccinetti, C., 1988, Contribution to the knowledge on the short and long-term effects of application of 40 mm codend mesh size in Adriatic trawl fishery – eastern Adriatic coast. FAO Fish. Rep. 394, 282290.
Lee, C.W., Lee, J.H., Cha, B.J., Kim, H.Y., 2005, Physical modeling for underwater flexible systems dynamic simulation. Ocean Eng. 32, 331347. CrossRef
Main J., Sangster G.I., 1991, A different approach to covered codend selection experiments. Scot. Fish. Work. Pap. No 4/91.
Millar, R.B., 1994, Sampling from trawl gears used in size selectivity experiments. ICES J. Mar. Sci. 51, 293298. CrossRef
Niedzwiedz, G., Hopp, M., 1998, Rope and net calculations applied to problems in marine engineering and fisheries research. Arch. Fish. Mar. Res. 46, 125138.
O'Neill, F.G., 1997, Differential equations governing the geometry of a diamond mesh codend of a trawl net. J. Appl. Mech. 64, 453, 1631–1648.
Priour, D., 1999, Calculation of net shapes by the finite element method with triangular elements. Commun. Numer. Meth. 15, 755763. 3.0.CO;2-M>CrossRef
Priour, D., 2001, Introduction of mesh resistance to opening in a triangular element for calculation of nets by the finite element method. Commun. Numer. Meth. 17, 229237. CrossRef
Reeves, S.A., Armstrong, D.W., Fryer, R.J., Coull, K.A., 1992, The effects of mesh size, codend extension length and codend diameter on the selectivity of Scottish trawls and seines. ICES J. Mar. Sci. 49, 279288. CrossRef
Sala A., Piccinetti C., Ferretti M., Buglioni G., Lucchetti A., Palumbo V., Ungaro N., 2005, Selectivity comparison of diamond and square mesh codends of Mediterranean bottom trawl. ICES CM 2005/B.04.
Stewart P.A.M., Robertson J.H.B., 1985, Small mesh covers. Scot. Fish. Res. Rep. 32.
Tsukrov, I., Eroshkin, O., Fredriksson, D., Swift, M.R., Celokkol, B., 2003, Finite element modelling of net panels using a consistent net element. Ocean Eng. 30, 251270. CrossRef
Wileman D.A., Ferro R.S.T., Fonteyne R., Millar R.B., 1996, Manual of methods of measuring the selectivity of towed fishing gear. ICES Coop. Res. Rep. 215.