Journal of Fisheries and Aquatic Science1816-49271996-0751Academic Journals Inc.10.3923/jfas.2007.17.26CamposAida FonsecaPaulo 1200721The utility of square mesh windows as by-catch excluders when placed either in the trawl upper belly or at the top of the cod-end is examined for a number of species captured off the Portuguese south coast. Data were obtained for the blue whiting, Micromesistius poutassou (Risso, 1826), the boarfish, Capros aper (L.), the horse mackerel, Trachurus trachurus (L.), the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), the chub mackerel, Scomber japonicus Houttuyn, 1782, the European hake, Merluccius merluccius (L.) and the rose shrimp, Parapenaeus longirostris (Lucas, 1846). Active escape behaviour was evidenced for blue whiting and blue jack mackerel, these being the only species escaping in significant amounts, particularly when the square mesh window was placed on the top of cod-end (54 and 48%, in weight, respectively). For the remaining fish species, the data suggest the need for appropriate stimuli in order to improve escape behaviour. The losses of shrimps were equal for both window locations (about 11%, in weight).]]>Arkley, K.,1990Nephrops trawls-MFV Heather Sprig November/December 1990.]]>1990Armstrong, M.J., R.P. Briggs and D. Rihan,1998Nephrops trawls.]]>34179189Boddeke, R.,19961996Briggs, R.P.,1992Nephrops fishery.]]>13133152Briggs, R.P. and J.H.B. Robertson,1993Nephrops fishery.]]>1993Broadhurst, M.K. and S.J. Kennelly,1995Argyrosornus hololepidotus) in the Hawkesbury river prawn-trawl fishery.]]>46953958Broadhurst, M.K., S.J. Kennelly and B. Isaksen,19962789111Broadhurst, M.K. and S.J. Kennelly,199627203214Broadhurst, M.K. and S.J. Kennelly,199795653664Broadhurst, M.K., S.J. Kennelly and S. Eayrs,19999718Campos, A. and P. Fonseca,2003Trachurus trachurus), European hake (Merluccius merluccius) and axillary seabream (Pagellus acarne) in the shallow groundfish assemblage off the South-West coast of Portugal.]]>67249260Campos, A., P. Fonseca and V. Henriques,200363213233Campos, A. and P. Fonseca,200469147156Conover, W.J.,19802nd Edn.Pages: 493Pages: 493Glass, C.W., C.S. Wardle and S.J. Gosden,19931969297Graham, N. and R.J. Kynoch,200149207218Graham, N., R.J. Kynoch and R.J. Fryer,200362361375Hannah, R.W., S.A. Jones and K.M. Matteson,2003Pandalus jordani) Trawls.]]>2003Hendrickson, L.,2005Loligo pealei) fishery.]]>2005Madsen, N., T. Moth-Poulsen and N. Lowry,1998Gadus morhua) fishery.]]>36114Madsen, N., T. Moth-Poulsen, R. Holst and D. Wileman,1999Nephrops (Nephrops norvegicus) trawl fishery.]]>42167181Madsen, N., R. Holst and L. Foldager,200257223235Madsen, N. and K.J. Staehr,200571241245Madsen, N., V. Tschernij, K. Hansen and P.O. Larsson,200678298308Robertson, J.H.B. and P.A.M. Stewart,198844148161Robertson, J.H.B. and A.M. Shanks,1994Nephrops, haddock and whiting of square mesh window position in a Nephrops trawl.]]>3255Scandrol, J.P., T.J. Underwood and M.K. Broadhurst,2006104533541Thorsteinsson, G.,1992Nephrops trawling off South-Iceland.]]>1992Ulmestrand, M. and P.O. Larsson,1991Nephrops trawl.]]>1991Wileman, D., R.S.T. Ferro, R. Fonteyne and R.B. Millar,19661966