Reduction of by-catch and discards in the Algarve small-scale coastal fishery using a monofilament trammel net rigged with a guarding net
DOI:
https://doi.org/10.3989/scimar.04734.16BKeywords:
trammel net, guarding net, by-catch, discards, small-scale fisheriesAbstract
Experimental fishing was conducted off the port of Quarteira (southern Portugal) from October 2016 to February 2017 using standard trammel nets and modified nets rigged with a guarding net. The commercial catches of trammel nets rigged with a guarding net were 46.1% and 38.0% less than those of the standard net in numbers and economic value. However, there were significantly fewer commercial discards in biomass in the modified trammel nets (68.2%) and by-catch abundance and biomass were also lower in the modified nets (41.8% and 17.3% less, respectively). For the two main fish by-catch species, the modified net caught 62.2% fewer longfin gurnards (C. obscurus) and 33.1% fewer greater weever (T. draco) than the standard nets. Timing the removal from the nets of the main by-catch and discards species revealed savings in time associated with the use of modified nets. However, net damage occurred twice as much as in the modified net, probably contributing to the reduced commercial catches. The results indicate that trammel nets with the guarding net reduce by-catch and discards and save time, but are unlikely to be adopted by fishers targeting soles due to the higher costs of the modified nets and losses in commercial catches and earnings.
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Aydin I., Gokce G., Metin C. 2013. Using guarding net to reduce regularly discarded invertebrates in trammel net fisheries operating on seagrass meadows (Posidonia oceanica) in ?zmir Bay (Eastern Aegean Sea). Mediterr. Mar. Sci. 14: 282-291. https://doi.org/10.12681/mms.425
Borges T.C., Erzini K., Bentes L., et al. 2001. By-catch and discarding practices in five Algarve (southern Portugal) métiers. J. Appl. Ichthyol. 17: 104-114. https://doi.org/10.1046/j.1439-0426.2001.00283.x
Carneiro M., Martins R., Rebordão F.R. 2006. Contribuição para o conhecimento das artes de pesca utilizadas no Algarve. Publicações Avulsas do IPIMAR Nº 13, 76 pp. + 57 planos técnicos.
Clarke K.R., Gorley R.N. 2006. PRIMER v6: User Manual/Tutorial. PRIMER-E, Plymouth, 192 pp.
Commission of the European Communities (CEC). 2007. Communication from the Commission to the Council and the European Parliament - A policy to reduce unwanted by-catches and eliminate discards in European fisheries {SEC (2007) 380} {SEC(2007) 381}, EUR-Lex COM/2007/0136 final.
Dekker C.J. 2001. Chronic pain and impairment of function after a sting by the great weaver fish (Trachinus draco). Ned. Tijdschr. Geneeskd. 145: 881-884. PMid:11379401
Erzini K., Gonçalves J.M.S., Bentes L., et al. 2006. Size selectivity of trammel nets in southern European small-scale fisheries. Fish. Res. 79: 183-201. https://doi.org/10.1016/j.fishres.2006.03.004
Gelcich S., Buckley P, Pinnegar J.K., et al. 2014. Public awareness, concerns, and priorities about anthropogenic impacts on marine environments. Proc. Natl. Acad. Sci. USA 111: 15042-15047. https://doi.org/10.1073/pnas.1417344111 PMid:25288740 PMCid:PMC4210304
Gilman E., Gearhart J., Price B., et al. 2010. Mitigating sea turtle by-catch in coastal passive net fisheries. Fish Fish. 11: 57-88. https://doi.org/10.1111/j.1467-2979.2009.00342.x
Gökçe G., Bozao?lu A.S., Erya?ar A.R., et al. 2016. Discard reduction of trammel nets in the Northeastern Mediterranean prawn fishery. J. Appl. Ichthyol. 32: 427-431. https://doi.org/10.1111/jai.13015
Hall M.A., Alverson D.L., Metuzals K.I. 2000. By-catch: problems and solutions. Mar. Pollut. Bull. 41: 204-219. https://doi.org/10.1016/S0025-326X(00)00111-9
Kelleher K. 2005. Discards in the world's marine fisheries. An update. FAO Fish. Tech. Pap. 470: 131 pp.
Maccarrone V., Buffa G., Di Stefano V., et al. 2014. Economic assessment of dolphin depredation damages and pinger use in artisanal fisheries in the archipelago of Egadi Islands (Sicily). Turk. J. Fish. Aquat. Sci. 14: 173-181. https://doi.org/10.4194/1303-2712-v14_1_19
Martin G.R., Crawford R. 2015. Reducing bycatch in gillnets: A sensory ecology perspective. Global Ecol. Conserv. 3: 28-50. https://doi.org/10.1016/j.gecco.2014.11.004
Melvin E.F., Parrish J.K., Conquest L.L. 1999. Novel Tools to Reduce Seabird Bycatch in Coastal Gillnet Fisheries. Cons. Biol. 13: 1386-1397. https://doi.org/10.1046/j.1523-1739.1999.98426.x
Metin C., Gökçe G., Aydın ?., et al. 2009. By-catch reduction in trammel net fishery for prawn (Melicertus kerathurus) by using guarding net in Izmir Bay on Aegean Coast of Turkey. Turk. J. Fish. Aquat. Sci. 9: 133-136. https://doi.org/10.4194/trjfas.2009.0202
Olguner M.T., Deval M.C. 2013. Catch and selectivity of 40 and 44 mm trammel nets in small-scale fisheries in the Antalya Bay, Eastern Mediterranean. Ege J. Fish. Aquat. Sci. 30: 167-173.
Sartor P., Silvestri R., Sbrana M., et al. 2007. Experimentation of technical devices for the discard reduction in the set net fishery along the Livorno coast, Italy. Biol. Mar. Mediterr. 14: 360-361.
Stergiou K.I., Moutopoulos D.K., Soriguer M.C., et al. 2006. Trammel net species composition, catch rates and métiers in southern European waters: a multivariate approach. Fish. Res. 79: 170-182. https://doi.org/10.1016/j.fishres.2006.03.003
Vecchioni L., Milisenda G., Massi D., et al. 2016. Can we reduce fishing discard in trammel nets? The case study in the MPA Egadi. Biol. Mar. Mediterr. 23: 47-48.
Wang J., Barkan J., Fisler S., et al. 2013. Developing ultraviolet illumination of gillnets as a method to reduce sea turtle bycatch. Biol. Lett. 9: 20130383. https://doi.org/10.1098/rsbl.2013.0383 PMid:23883577 PMCid:PMC3971673
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