Scientia Marina, Vol 82, No S1 (2018)

Bioeconomic analysis of the effects of modifying the trawl extension piece with T90 netting


https://doi.org/10.3989/scimar.04715.06A

Iván Sola
Institut de Ciències del Mar, CSIC, Spain
orcid http://orcid.org/0000-0003-2972-614X

Francesc Maynou
Institut de Ciències del Mar, CSIC, Spain
orcid http://orcid.org/0000-0001-7200-6485

Abstract


We assessed the effect of the European discards ban on the profitability of bottom trawlers in a case study fishery (GSA06, NW Mediterranean) in the transition period 2017-2018, when the species that characterize the fishery, viz. hake and red mullet, fall under the discards ban. We used the results of Sola and Maynou (2018) to simulate the adoption of a modified bottom trawl design using a T90 extension net to reduce the catches of undersize hake and red mullet. Our results show that the economic impact of the former discards brought to land on the fisheries operators is expected to be low, regardless of the possible commercial use of these unwanted catches. Furthermore, the adoption of a more selective bottom trawl design would increase the escape of undersize individuals and likely reduce fishing mortality of the target species, contributing to stock rebuilding and providing higher income to the fisheries operators in the medium to long term.

Keywords


discards ban; bottom trawl fisheries; T90 net; bioeconomic model; Mediterranean fisheries

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References


Baranov F.I. 1918. On the question of the biological basis of fisheries. Nauchnyi- Issledovatelskii Ikhtiologicheskii Institut, Izvestiya, 1: 81-128 (in Russian).

Colloca F., Cardinale M., Maynou F., et al. 2014. Rebuilding Mediterranean fisheries: a new paradigm for ecological sustainability. Fish Fish. 14: 89-109. https://doi.org/10.1111/j.1467-2979.2011.00453.x

European Commission (EC). 2013. European Council Regulation No 1380/2013 of the European Parliament and of the Council of 11 December 2013 on the Common Fisheries Policy, amending Council Regulations EC No 1954/2003 and EC No 1224/2009 and repealing Council Regulations EC No 2371/2002 and EC No 639/2004 and Council Decision 2004/585/EC. Official Journal of the European Union, L 354.

García-Rivera S., Sánchez Lizaso J.L., Bellido Millán J.M. 2015. A quantitative and qualitative assessment of the discard ban in European Mediterranean waters. Mar. Pol. 53: 149-158. https://doi.org/10.1016/j.marpol.2014.12.003

Heath M.R., Cook R.M., Cameron A.I., et al. 2014. Cascading ecological effects of eliminating fishery discards. Nature Commun. 5: 1-6. https://doi.org/10.1038/ncomms4893 PMid:24820200 PMCid:PMC4024762

Hordyk A., Ono K., Valencia S., et al. 2014. A novel length-based empirical estimation method of spawning potential ratio (SPR), and tests of its performance, for small-scale, data-poor fisheries. ICES J. Mar. Sci. 72: 217-231. https://doi.org/10.1093/icesjms/fsu004

Lleonart J., Maynou F. 2003. Fish stock assessments in the Mediterranean: state of the art. Sci. Mar. 67 (Suppl. 1): 37-49. https://doi.org/10.3989/scimar.2003.67s137

Macdonald P.D.M., Green P.E.J. 1988. User's Guide to Program MIX: An Interactive Program for Fitting Mixtures of Distributions. Ichthus Data Systems, Ontario. 58 pp. http://ms.mcmaster.ca/peter/mix/MIX23_Users_Guide.pdf

Macher C., Boncoeur J. 2010. Optimal selectivity and effort cost a simple bioeconomic model with an application to the Bay of Biscay Nephrops fishery. Mar. Res. Econ. 25: 213-232. https://doi.org/10.5950/0738-1360-25.2.213

Maynou F. 2014. Co-viability analysis of Western Mediterranean fisheries under MSY scenarios for 2020. ICES J. Mar. Sci. 71: 1563-1571. https://doi.org/10.1093/icesjms/fsu061

Maynou F., Gil M.M., Vitale S., et al. 2018. Fishers' perceptions of the European Union discards ban: perspective from south European fisheries. Mar. Pol. 89: 147-153 https://doi.org/10.1016/j.marpol.2017.12.019

Prellezo R., Carmona I., García D. 2016. The bad, the good and the very good of the landing obligation implementation in the Bay of Biscay: A case study of Basque trawlers. Fish. Res. 181: 172-185. https://doi.org/10.1016/j.fishres.2016.04.016

Prellezo R., Carmona I., García D., et al. 2017. Bioeconomic assessment of a change in fishing gear selectivity: The case of a single-species fleet affected by the landing obligation. Sci. Mar. 81: 371-380. https://doi.org/10.3989/scimar.04597.18A

Sartor P., Carbonara P., Lucchetti A., et al. 2016. Indagine conoscitiva sullo scarto della pesca alle specie demersali nei mari italiani. Valutazioni propedeutiche per l'implementazione delle disposizioni comunitarie in tema di obbligo di sbarco. Quaderni Nisea. 1, 40 pp.

Scott R.D., Sampson D.B. 2011. The sensitivity of long-term yield targets to changes in fishery age-selectivity. Mar. Pol. 35: 79-84. https://doi.org/10.1016/j.marpol.2010.08.005

Shepherd J.G., Pope J.G. 2002. Dynamic pool models I: Interpreting the past using Virtual Population Analysis. In: Hart P.J.B., Reynolds J.D., Handbook of Fish Biology and Fisheries, vol. 2: 127-163. Blackwell Science Ltd.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2013. Assessment of Mediterranean Sea stocks part I (STECF 13-22). Publications Office of the European Union, Luxembourg, EUR 26329 EN, JRC 86087, 400 pp.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2014. Assessment of Mediterranean Sea stocks - part 1 (STECF-14-17). Publications Office of the European Union, Luxembourg, EUR 26955 EN, JRC 93120, 393 pp.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2015a. Mediterranean Assessments part 2 (STECF-15-06). Publications Office of the European Union, Luxembourg, EUR 27221 EN, JRC 95822, 396 pp.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2015b. Mediterranean assessments part 1 (STECF-15-18). Publications Office of the European Union, Luxembourg, EUR 27638 EN, JRC 98676, 410 pp.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2016. The 2016 Annual Economic Report on the EU Fishing Fleet (STECF 16-11). Publications Office of the European Union, Luxembourg.

Scientific, Technical and Economic Committee for Fisheries (STECF). 2017. Mediterranean assessments 2016- part 2 (STECF-17-06). Publications Office of the European Union, Luxembourg; EUR 28359 EN.

Sola I, Maynou F. 2018. Assessment of the relative catch performance of hake, red mullet and striped red mullet in a modified trawl extension with T90 netting. Sci. Mar. 82S1.

Tsagarakis K., Palialexis A., Vassilopoulou V. 2014. Mediterranean fishery discards: review of the existing knowledge. ICES J. Mar. Sci. 71: 1219-1234. https://doi.org/10.1093/icesjms/fst074




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