Scientia Marina, Vol 71, No 4 (2007)

Trawl catch composition during different fishing intensity periods in two Mediterranean demersal fishing grounds


https://doi.org/10.3989/scimar.2007.71n4765

Pilar Sánchez
Institut de Ciències del Mar-CSIC, Barcelona, Spain

Paolo Sartor
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Livorno, Italy

Laura Recasens
Institut de Ciències del Mar-CSIC, Barcelona, Spain

Alessandro Ligas
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Livorno, Italy

Javier Martin
Mediterraneo Servicios Marinos, Antigua Estación Marítima, Alacant, Spain

Stefano De Ranieri
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Livorno, Italy

Montserrat Demestre
Institut de Ciències del Mar-CSIC, Barcelona, Spain

Abstract


The study was carried out in two fishing grounds on the Mediterranean continental shelf: one in the Adriatic Sea and one in the Catalan Sea. Samplings on board otter trawlers were performed from November 2002 to December 2003 in the Catalan Sea and from February 2003 to January 2004 in the Adriatic Sea. The Adriatic fishing ground was affected by high fishing intensity from January to June, while the Catalan area was highly exploited from September to February. Fishing activity in the Adriatic area was closed for 45 days, and 62 days in the Catalan area; both periods were in summer. Totals of 92 and 88 species were collected in the Adriatic and Catalan fishing grounds respectively. The species composition of the retained and discarded fractions showed close agreement between the two areas. Mullus barbatus showed very low discard rates in both areas, as well as Loligo vulgaris in the Catalan Sea and Merluccius merluccius in the Adriatic Sea. In both fishing grounds Squilla mantis showed high catch rates with low discards, except in March in the Catalan area. In the Adriatic Sea Liocarcinus depurator was characterized by large discard fractions. In both fishing grounds the retained fraction was slightly higher in the high fishing intensity periods than in the low intensity ones (Adriatic Sea: 0.613 vs 0.524; Catalan Sea: 0.597 vs 0.539), even though the Kruskall Wallis test revealed significant differences (p<0.05) only for the Adriatic Sea.

Keywords


descartes; veda; esfuerzo pesquero; Mediterráneo Central y Occidental

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References


Alverson, D.L. and S.E. Hughes. – 1996. By-catch: from emotion to effective natural resource management. Rev. Fish. Biol. And Fish., 6: 443-462. doi:10.1007/BF00164325

Alverson, D.L., M.H. Freeberg, S.A. Murawski and J.G. Pope. – 1994. A global assessment of fisheries by catch and discards. FAO Fish. Tech. Pap., 339: 233 pp.

Bas, C. – 2005. Fishery research: current approches, tensions and emerging aspects. The future and how to approch it. Sci. Mar. 69(suppl. 1): 139-156.

Caddy, J.F. – 1993. Some future perspectives for assessment and management of Mediterranean fisheries. Sci. Mar., 57: 121-130.

Carbonell, A., P. Martín, S. De Ranieri and WEDIS team. – 1998. Discards of the western Mediterranean trawl fleets. Rapp. Comm. int. Mer Médit., 35: 292-293.

De Juan, S., M. Demestre, P. Sanchez, P. Sartor, A. Ligas, A. De Biasi, A. Palanques, L. Recasens and J. Cartes. – 2005. Seasonal area closure in two Mediterranean trawl fishing grounds: consequences on epibenthic fauna. ASLO Abstract Book, 39.

Demestre, M., M. Sbrana, F. Alvarez and P. Sánchez. – 1997. Analysis of the interaction of fishing gear in Mullus barbatus fisheries of the Western Mediterranean. J. Appl. Ichthyol., 13: 49-56 doi:10.1111/j.1439-0426.1997.tb00100.x

Demestre, M., P. Sánchez and P. Abelló. – 2000. Demersal fish assemblages of the continental shelf and upper slope of the Catalan coast, NW Mediterranean. J. Mar. Biol. Ass. UK, 80: 981-988. doi:10.1017/S0025315400003040

D’Onghia G., R. Carlucci, P. Maiorano and M. Panza. – 2003. Discards from deep-water bottom trawling in the eastern-central Mediterranaean Sea and effects of mesh size changes. J. Northw. Atl. Fish. Sci., 31: 245-262.

Greenstreet S.P.R. and S. I. Rogers. – 2006. Indicators of the health of the North Sea fish community: identificatifying reference levels for an ecosystem approach to management. ICES J. Mar. Sci.,63: 573-593. doi:10.1016/j.icesjms.2005.12.009

Guillén, J. and A. Palanques. – 1997. A shoreface zonation in the Ebro Delta based on grain size distribution. J. Coast. Res., 13: 867-878.

Jennings, S. and M.J. Kaiser. – 1998. The effects of fishing on marine ecosystems. Adv. Mar. Biol., 34: 201-352. doi:10.1016/S0065-2881(08)60212-6

Kaiser, M.J. and S.J. De Groot (eds). – 1999. Effects of Fishing on Non-target Species and Habitats: Biological, Conservation and Socio-economic Issues. Blackwell Science, Oxford (UK). Kelleher, K. – 2005. Discards in the world’s marina fisheries. An update. FAO Fish. Tech. Pap., 470.

Machias, A., V. Vassilopoulou, D. Vatsos, P. Bekas, A. Kallianiotis, C. Papaconstantinou and N. Tsimenides. – 2001. Bottom trawl discards in the northeastern Mediterranean Sea. Fish. Res., 53: 181-195. doi:10.1016/S0165-7836(00)00298-8

Martin, P., P. Sartor and M. Garcia-Rodriguez. – 1999. Exploitation patterns of the European hake Merluccius merluccius, red mullet Mullus barbatus and striped red mullet Mullus surmuletus in the western Mediterranean. J. Appl. Ichthyol., 15: 24-28. doi:10.1046/j.1439-0426.1999.00125.x

Moranta, J., E. Massuti and B. Morales-Nin. – 2000. Fish catch composition of the deep-sea decapod crustacean fisheries in the Balearic Islands (western Mediterranean). Fish. Res., 45: 253-264. doi:10.1016/S0165-7836(99)00119-8

Piet, G.J. and S. Jennings. – 2005. Response of potential fish community indicators to fishing. ICES J. Mar. Sci., 62: 214-225. doi:10.1016/j.icesjms.2004.09.007

Pipitone, C., F. Badalamenti, G. D’Anna and B. Patti. – 2000. Fish biomass increase after a four-year trawl ban in the Gulf of Castellammare (NW Sicily, Mediterranean Sea). Fish. Res., 48: 23-30. doi:10.1016/S0165-7836(00)00114-4

Pranovi, F., S. Raicevich, G. Franceschini, P. Torricelli and O. Giovanarvi. – 2001: Discard analysis and damage to non-target species in the “rapido” trawl fishery. Mar. Biol., 139: 863-875. doi:10.1007/s002270100646

Rice, J. and H. Gislason. – 1996. Patterns of change in the size spectra of numbers and diversity of the North Sea fish assemblage, as reflected in surveys and models. ICES J. Mar. Sci., 53: 1214-1225. doi:10.1006/jmsc.1996.0146

Rochet, M.J., I. Péronnet and V.M. Trenkel. – 2002. An analysis of discards from the French trawler fleet in the Celtic Sea. ICES J. Mar. Sci., 59: 538-552. doi:10.1006/jmsc.2002.1182

Sanchez, P., M. Demestre and P. Martín. – 2004. Characterization of the discards generated by bottom trawling in the Northwestern Mediterranean. Fish. Res., 67: 71-80 doi:10.1016/j.fishres.2003.08.004

Sartor P., M. Sartini, B. Reale AND M. Sbrana. – 2001. Analysis of the discard practices in the Merluccius merluccius (L. 1758) bottom trawl fishery of the northern Tyrrhenian Sea. Biol. Mar. Medit., 8: 771-774.

Sartor P., M. Sbrana, B. Reale and P. Belcari. – 2003. Impact of the deep sea trawl fishery on demersal communities of the northern Tyrrhenian Sea- (Western Mediterranean). J. Northw. Atl. Fish. Sci., 31: 1-10.

Siegel S. and N.J. Castellan. – 1988. Nonparametric Statistics for the Behavioural Sciences. New York: McGraw-Hill.

Stergiou K.I., A. Economou, C. Papaconstantinou, N. Tsimenides and S. Kavadas. – 1998. Estimates of discard in the Hellenic commercial trawl fishery. Rapp. Comm. Int. Mer Médit., 35: 490-491.

Tsangridis A., P. Sánchez and D. Ioannidou. – 2002. Exploitation patterns of Octopus vulgaris in two Mediterranean areas. Sci. Mar., 66: 59-68.




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