Mitigating unwanted catches in the southern Iberian hake stock fisheries: Improving fishing technology vs market control policies

Authors

DOI:

https://doi.org/10.3989/scimar.04739.25A

Keywords:

unwanted catches, selectivity, landing obligation, ban on sale juveniles, age-structured models, European Hake, Southern Iberian Hake

Abstract


Unwanted catches can be reduced by improving fishing effectiveness in targeting species and sizes and by banning their sale for human consumption. The landing obligation introduced by the European Union can be seen as a combination of these two measures, and the aim of this paper is to analyse its effects on the Southern Iberian Hake Stock fishery. To this end, reference points for a mixed fishery are computed under the two measures as the steady-state solution of a dynamic optimal management problem. Our results show that measures that improve selectivity obtain better results than sales ban strategies in terms of increasing yields and stocks and reducing discards. In particular, we find that reducing the selectivity parameters by 90% for the three early ages leads to an almost six-fold increase in the hake yield and lowers the discard rate by more than 20 percentage points. Banning the sale of the two youngest ages also increases hake yield by 21% and the discard rate by 7 percentage points.

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References

Alzorriz N., Arregi L., Herrmann B., et al. 2016. Questioning the effectiveness of technical measures implemented by the Basque bottom otter trawl fleet: Implications under the EU landing obligation. Fish. Res. 175: 116-126. https://doi.org/10.1016/j.fishres.2015.11.023

Armstrong D., Ferro R., MacLennan D.N., et al. 1990. Gear selectivity and the conservation of fish. J. Fish Biol. 37: 261-262. https://doi.org/10.1111/j.1095-8649.1990.tb05060.x

Baranov F. 1918. On the question of the biological basis of fisheries. Institute for Scientific Ichthyological Investigations, Proceedings 1: 81-128.

Batsleer J., Rijnsdorp A., Hamon K., et al. 2016. Mixed fisheries management: Is the ban on discarding likely to promote more selective and fuel efficient fishing in the Dutch flatfish fishery? Fish. Res. 174: 118-128. https://doi.org/10.1016/j.fishres.2015.09.006

Bayse S.M., Herrmann B., Lenoir H., et al. 2016. Could a T90 mesh codend improve selectivity in the Belgian beam trawl fishery? Fish. Res. 174: 201-209. https://doi.org/10.1016/j.fishres.2015.10.012

Broadhurst M., Kennelly T., Gray C. 2007. Strategies for improving the selectivity of fishing gears. In: Kennelly S. (ed.), By-catch Reduction in the World's Fisheries. Springer, Cronulla, Australia, pp. 1-21. https://doi.org/10.1007/978-1-4020-6078-6_1

Catchpole T., Frid C., Gray T. 2006. Resolving the discard problem. A case study of the English Nephrops fishery. Mar. Policy 30: 821-831. https://doi.org/10.1016/j.marpol.2006.04.002

Catchpole T., Ribeiro-Santosa A., Mangib S., et al. 2017. The challenges of the landing obligation in EU fisheries. Mar. Policy 82: 76-86. https://doi.org/10.1016/j.marpol.2017.05.001

Clark C., Mangel M. 2000. Dynamic state variable models in ecology: methods and applications. Oxford Univ. Press, Oxford, UK.

Cotter A., Pilling G. 2007. Landings, logbooks and observer surveys: improving the protocols for sampling commercial fisheries. Fish Fish. 8: 123-152. https://doi.org/10.1111/j.1467-2679.2007.00241.x

Da Rocha J.M., Gutiérrez M.J. 2011. Lessons from the northern hake long-term management plan: Could the economic assessment have accepted it? ICES J. Mar. Sci. 68: 1937-1941. https://doi.org/10.1093/icesjms/fsr105

Da Rocha J.M., Cervi-o S., Gutiérrez M.J. 2010. An endogenous bio-economic optimization algorithm to evaluate recovery plans: an application to southern hake. ICES J. Mar. Sci. 69: 1957-1962. https://doi.org/10.1093/icesjms/fsq116

Da Rocha J.M., Gutiérrez M.J., Antelo L.T. 2012a. Pulse vs. optimal stationary fishing: The Northern Stock of hake. Fish. Res. 121-122: 51-62. https://doi.org/10.1016/j.fishres.2012.01.009

Da Rocha J.M., Gutiérrez M.J., Cervi-o S. 2012b. Reference points based on dynamic optimization: a versatile algorithm for mixed-fishery management with bioeconomic age-structured models. ICES J. Mar. Sci. 69: 660-669. https://doi.org/10.1093/icesjms/fss012

Da Rocha J.M., Gutiérrez, M. J., Antelo L.T. 2013. Selectivity, pulse fishing and endogenous lifespan in Beverton-Holt models. Environ. Resour. Econ. 54: 139-154. https://doi.org/10.1007/s10640-012-9585-z

Da Rocha J.M., García Cutrín J., Gutiérrez M.J., et al. 2016. Reconciling yield stability with international fisheries agencies precautionary preferences: The role of non constant discount factors in age structured models. Fish. Res. 173: 282-293. https://doi.org/10.1016/j.fishres.2015.08.024

de Vos B., Döring R., Aranda M., et al. 2016. New modes of fisheries governance: Implementation of the landing obligation in four European countries. Mar. Policy 64: 1-8. https://doi.org/10.1016/j.marpol.2015.11.005

Deval M., Özgen G., Özbilgin H. 2006. Selectivity of 50mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean. J. Appl. Ichthyol. 32: 1041-1057. https://doi.org/10.1111/jai.13128

Directorate-General for Maritime Affairs and Fisheries (EC). 2017. Support from the European Maritime and Fisheries Fund (EMFF). Opportunities for small-scale coastal fishermen. European Union Publications.

Dunn D., Boustany A., Halpin P. 2011. Spatio-temporal management of fisheries to reduce by-catch and increase fishing selectivity. Fish Fish. 12: 110-119. https://doi.org/10.1111/j.1467-2979.2010.00388.x

European Council (EC). 2005. Council Regulation No 2166/2005 of 20 December 2005 establishing measures for the recovery of the Southern hake and Norway lobster stocks in the Cantabrian Sea and Western Iberian peninsula and amending Regulation (EC) No. 850/98 for the conservation of fishery resources through technical measures for the protection of juveniles of marine organisms. Off. J. European Union, L 345.

European Union (EU). 2013. Regulation (EU) 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. Off. J. European Union.

European Union (EU). 2014. Regulation (EU) No 508/2014 of the European Parliament and of the Council of 15 May 2014 on the European Maritime and Fisheries Fund and repealing Council Regulations (EC) No 2328/2003, (EC) No 861/2006, (EC) No 1198/2006 and (EC) No 791/2007 and Regulation (EU) No 1255/2011 of the European Parliament and of the Council. Off. J. European Union, L 149/1.

Feekings J., Bartolino V., Madsen N., et al. 2012. Fishery discards: Factors affecting their variability within a demersal trawl fishery. PLoS ONE 7: e36409. https://doi.org/10.1371/journal.pone.0036409 PMid:22558463 PMCid:PMC3340337

Fernández C., Cervi-o S., Pérez N., et al. 2010. Stock assessment and projections incorporating discards estimates in some years: An application to the hake stock in ICES divisions VIIIc and IXa. ICES J. Mar. Sci. 67: 1185-1197. https://doi.org/10.1093/icesjms/fsq029

García D., Urtizberea A., Diez G., et al. 2013. Bioeconomic management strategy evaluation of deep water stocks using the FLBEIA model. Aquat Living Resour. 26: 365-379. https://doi.org/10.1051/alr/2013069

García D., Prellezo R., Sampedro P., et al. 2016. Bioeconomic multistock reference points as a tool for overcoming the drawbacks of the landing obligation. ICES J. Mar. Sci. 74: 511-524. https://doi.org/10.1093/icesjms/fsw030

Gorelli G., Company J., Bahamón N., et al. 2017. Improving codend selectivity in the fishery of the deep-sea red shrimp Aristeus antennatus in the northwestern Mediterranean Sea. Sci. Mar. 81: 381-386. https://doi.org/10.3989/scimar.04575.25A

Guillen J., Macher C., Merzéréaud M., et al. 2014. The effect of discards and survival rate on the Maximum Sustainable Yield estimation based on landings or catches maximisation: Application to the nephrops fishery in the Bay of Biscay. Mar. Policy 50: 207-214. https://doi.org/10.1016/j.marpol.2014.06.005

Heikinheimo O., Setälä J., Saarni K., et al. 2006. Impacts of mesh-size regulation of gillnets on the pikeperch fisheries in the Archipelago Sea, Finland. Fish. Res. 77: 192-199. https://doi.org/10.1016/j.fishres.2005.11.005

Herrmann B., Priour D., Ludvig A. 2007. Simulation-based study of the combined effect on codend size selection of turning meshes by 90 and reducing the number of meshes in the circumference for round fish. Fish. Res. 84: 222-232. https://doi.org/10.1016/j.fishres.2006.10.020

ICES. 2015. Working Group on the Assessment of Southern Shelf Stocks of Hake, Monk and Megrim. Multiannual Management Plans SWW Meeting (WGHMM). Vigo, May 25-29th.

ICES. 2016. Report of the Working Group for the Bay of Biscay and the Iberian waters Ecoregion (WGBIE). 13-19 May 2016, ICES Headquarters, Copenhagen, Denmark. ICES CM/ACOM:12. 513 pp.

ICES. 2017a. Mixed fisheries advice for the Bay of Biscay and Atlantic Iberian Waters. ICES Advice on fishing opportunities, catch, and effort Bay of Biscay and Iberian Coast Ecoregion. Published 30 June 2017.

ICES. 2017b. Report of the Working Group for the Bay of Biscay and Iberian waters Ecoregion (WGBIE). 4-11 May 2017, ICES Headquarters, Copenhagen, Denmark. ICES CM/ACOM:12. 534 pp.

ICES. 2017c. Report of the Working Group on Mixed Fisheries Advice (WGMIXFISH- ADVICE). 22-27 May 2017, ICES Headquarters, Copenhagen, Denmark. ICES CM/ACOM:12. 128 pp.

Kayka H., Toka A., Özbilgin H. 2009. Selectivity of commercial, larger mesh and square mesh trawl codends for deep water rose shrimp Parapenaeus longirostris (Lucas, 1846) in the Aegean Sea. Sci. Mar. 73: 597-604. https://doi.org/10.3989/scimar.2009.73n3597

Kelleher K. 2005. Discards in the world's marine fisheries. Un update. FAO Fish. Tech. Pap. 470: 1-131.

Kennelly S., Broadhurst M. 2002. Bycatch begone: changes in the philosophy of fishing technology. Fish Fish. 3: 340-355. https://doi.org/10.1046/j.1467-2979.2002.00090.x

Kraak S., Bailey N., Cardinale M., et al. 2013. Lessons for fisheries management from the EU cod recovery plan. Mar. Policy 37: 200-213. https://doi.org/10.1016/j.marpol.2012.05.002

Leontief W. 1944. The Structure of the American Economy 1919- 1929. Harvard Univ. Press, Cambridge, MA.

Macher C., Guyader O., Talidec C., et al. 2008. A cost-benefit analysis of improving trawl selectivity in the case of discards: The Nephrops norvegicus fishery in the Bay of Biscay. Fish. Res. 92: 76-89. https://doi.org/10.1016/j.fishres.2007.12.021

Madsen N., Holst R., Foldager L. 2002. Escape windows to improve the size selectivity in the Baltic cod trawl fishery. Fish. Res. 57: 223-235. https://doi.org/10.1016/S0165-7836(01)00355-1

Maeda E.E., Mäntyniemi S., Despoti S., et al. 2017. A bayesian model of fisheries discards with flexible structure and priors defined by experts. Ecol. Model. 366: 1-14. https://doi.org/10.1016/j.ecolmodel.2017.10.007

Mortensen L., Ulrich C., Eliasen S., et al. 2017. Reducing discards without reducing profit: free gear choice in a Danish result-based management trial. ICES J. Mar. Sci. 74: 1469-1479. https://doi.org/10.1093/icesjms/fsw209

Mytilineou C., Politou C., Fourtouni A. 1998. Trawl selectivity studies on Nephrops norvegicus (L.) in the eastern Mediterranean Sea. Sci. Mar. 62(Suppl. 1): 107-116.

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

Revill A. 2012. Survival of discarded fish, a rapid review of studies on discard survival rates. Work produced in response to: Request for services commitment No s12.615631, European Commission, Directorate-general for Maritime Affairs and Fisheries. Policy development and coordination. Brussels, MAREA2.

Sánchez P., Demestre M., Martín P. 2004. Characterisation of the discards generated by bottom trawling in the northwestern Mediterranean. Fish. Res. 67: 71-80. https://doi.org/10.1016/j.fishres.2003.08.004

Sánchez P., Sartor P., Recasens L., et al. 2007. Trawl catch composition during different fishing intensity periods in two Mediterranean demersal fishing grounds. Sci. Mar. 71: 765-773. https://doi.org/10.3989/scimar.2007.71n4765

Schrope M. 2010. What's the catch? Nature 465: 540-542. https://doi.org/10.1038/465540a PMid:20520684

Shepherd J.G. 1982. Food for thought: pretty good multispecies yield. J. Cons. Int. Explor. Mer. 40: 67-75. https://doi.org/10.1093/icesjms/40.1.67

Suuronen P., Sardá F. 2007. By-catch reduction techniques in European fisheries: Traditional methods and potential innovations. In: Kennelly S. (ed.), By-catch Reduction in the World's Fisheries. Springer, Dordrecht, The Netherlands. pp. 37-74 https://doi.org/10.1007/978-1-4020-6078-6_3

Tokaç A., Herrmann B., Aydına C., et al. 2014. Predictive models and comparison of the selectivity of standard (T0) and turned mesh (T90) codends for three species in the Eastern Mediterranean. Fish. Res. 150: 76-88. https://doi.org/10.1016/j.fishres.2013.10.015

Tolotti M., Filmalter J., Bacha P., et al. 2015. Banning is not enough: The complexities of oceanic shark management by tuna regional fisheries management organizations. Glob. Ecol. Conserv. 4: 1-7. https://doi.org/10.1016/j.gecco.2015.05.003

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

Uhlmann S., van Helmond A., Stefánsdóttir E., et al. 2014. Discarded fish in European waters: general patterns and contrasts. ICES J. Mar. Sci. 71: 1235-1245. https://doi.org/10.1093/icesjms/fst030

Villasante S., Pierce G., Pita C., et al. 2016a. Fishers' perceptions about the EU discards policy and its economic impact on small-scale fisheries in Galicia (North West Spain). Ecol. Econ. 130: 130-138. https://doi.org/10.1016/j.ecolecon.2016.05.008

Villasante S., Pita C., Pierce G., et al. 2016b. To land or not to land: How do stakeholders perceive the zero discard policy in European small-scale fisheries? Mar. Policy 71: 166-174. https://doi.org/10.1016/j.marpol.2016.05.004

Vázquez-Rowe I., Moreira M., Feijoo G. 2011. Estimating global discards and their potential reduction for the Galician fishing fleet (NW Spain). Mar. Policy 35: 140-147. https://doi.org/10.1016/j.marpol.2010.08.012

Published

2018-12-30

How to Cite

1.
Da-Rocha JM, García-Cutrín J, Gutiérrez MJ. Mitigating unwanted catches in the southern Iberian hake stock fisheries: Improving fishing technology vs market control policies. Sci. mar. [Internet]. 2018Dec.30 [cited 2024Mar.28];82(S1):63-74. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1759

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