Defining and estimating global marine fisheries bycatch

Davies, D. Rhodri; Cripps, Simon J.; Nickson, Amanda; Porter, Gina

doi:10.1016/j.marpol.2009.01.003

Cited by 403 publications

(256 citation statements)

References 21 publications

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“…It is important to distinguish here between 'entanglement' and 'bycatch'. Bycatch can be defined as unselective catch of either unused or unmanaged species during fishing, with a particular focus on 'active' gear, whereas ghost gear can be defined as equipment of which the fisher has lost operational control (Smolowitz 1978, Davies et al 2009). Therefore, here we consider animals caught in passive ghost fishing gear as entangled, not bycaught.…”

Section: Types Of Marine Debris Causing Entanglementmentioning

confidence: 99%

A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action

Duncan¹,

Botterell²,

Broderick³

et al. 2017

Endang. Species. Res.

122

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Section: Types Of Marine Debris Causing Entanglementmentioning

confidence: 99%

A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action

Duncan¹,

Botterell²,

Broderick³

et al. 2017

Endang. Species. Res.

122

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“…Although mass and gross nutritional energy of aquaculture co-products may change in proportion to each other, they are generally regarded as less subject to volatility than the value. Conversely the physical characteristics of fishery by-products may vary considerably with seasonality, due to the sexual maturity of the catch or the constituent species, including by-catch (Davies 2009;Thrane 2004). …”

Section: Apportioning Impacts In Multi-functional Processesmentioning

confidence: 99%

“…For example the seasonality of capture fisheries (Thrane 2004, Davies et al 2009 and the ratios of aquaculture feed ingredients according to quality, current price and availability (Naylor et al 2009).…”

mentioning

confidence: 99%

Perspectives on the Utilization of Aquaculture Coproduct in Europe and Asia: Prospects for Value Addition and Improved Resource Efficiency

Newton

Telfer

Little

2013

Critical Reviews in Food Science and Nutrition

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Faculty of Natural SciencesInstitute of Aquaculture Doctor of PhilosophyBy-products and mortalities from aquaculture have often posed significant challenges to the industry because of their low value resulting in high costs and environmental impact from their disposal. However increasing interest is being expressed in their utilisation to add value to the aquaculture industry and provide synergies with industries which had previously been in competition with aquaculture.Current and prospective processing by-product and farm mortality utilisation strategies were reviewed along with regulations and standards which aim to control their use and protect against human and animal health hazards.The role of aquaculture and fishery by-products in the supply of fishmeal was investigated and it was found that both sectors had the potential to contribute to increasing global supply. There were significant quantities of processing by-products identified which could be directed to fishmeal manufacture but there were also significant amounts of fish production which were not being processed in some regions and could also add to supplies. Processing by-products from aquaculture species often exceed 50% of the production by mass and therefore their efficient utilisation is of significant importance to the overall performance of the value chain. Their utilisation ii strategies are diverse and in some circumstances offer the possibility to add significant value.Life Cycle Assessment (LCA) is increasingly being used to inform decision makers and consumers about the environmental performance of goods and services to make choices on best practices and informative decisions on purchasing choices. Current methodology in LCA was critiqued and developed to be used for identifying disproportionate impacts from by-product industries and comparative assessment of the eco-efficiency of value chains from Thai shrimp, Vietnamese Pangasius catfish and Scottish salmon aquaculture.New LCA methodology was developed assessing the eco-efficiency of co-products as a whole and in relation to a tonne of edible yield. Measuring the impact of the by-product industry in relation to their edible yield gave different results to measuring their ecoefficiency between the three study species. It was found that the Thai shrimp value chain was the most eco-efficient when by-products were directed to chitosan and hydrolysate manufacture, but production of the salmon was the least impacting between the species in terms of edible yield. Pangasius was the most environmentally impacting of the three species value chains using both methods. It was also found that the upstream impacts of fish and shrimp production, especially feed manufacture, contributed most to the environmental impact in most circumstances, using both economic and mass allocation.Although the methodology produced interesting results, there were some drawbacks and the data sets also had several gaps which led to some assumptions, which could have skewed the results and interpretation.The cau...

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“…Kuwait's shrimp fishery targets three species: Penaeus semisulcatus, Metapenaeus affinis, Parapenaeopsis stylifera, and usually, more than 50% of catch is P. semisulcatus. Similar to other tropical and sub-tropical shrimp trawl fisheries (Stobutzki et al, 2001;Tonks, et al, 2008;Davies, et al, 2009), Kuwait's shrimp fishery also captures large quantities of bycatch (as high as 35,000-55,500 t) every year. These bycatches were mostly dumped at the sea with little (<2%) retained (Ye et al, 2000), resulting in a huge quantity of wasted food resources and killing large number juveniles of commercial species.…”

Section: Introductionmentioning

confidence: 99%

Retained and Discarded Bycatch from Kuwait’s Shrimp Fishery

Chen

Almatar²,

Al-Saffar³

et al. 2012

AST

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The quantity and species compositions of both retained and discarded bycatch of the Kuwait's shrimp fishery was investigated for the first time directly through onboard observation and sampling of a fishing vessel. The observations were conducted on a 131 tonne double-rigged shrimp trawler twice a month during the shrimp season from September 2010 through January 2011. The shrimp catch rate declined sharply from 19.6 to 1.1 kg/h as the season progressing, while bycatch rate remained in a high and relatively stable between Aquatic Science and Technology ISSN 2168-9148 2013 www.macrothink.org/ast 87 106 and 81.5 kg/h, and resulted in a large variation (5.4-73.6) of byatch-to-shrimp ratio from the season's start to the season end. The retained bycatch was always low (11.6-15.9% of the total bycatch) throughout the season. The total species recorded in the bycatch was 112, with 55 retained and 93 discarded at sea. Thirty-nine species occurred both in retained and discarded bycatches. Saurida tumbil, Nematalosa nasus, Sphyraena flavicauda, Acanthopagrus latus and Otolithes ruber were the most dominant fish species in the retained bycatch. Discards dominated both by undersized commercially valuable species including Ilisha melastoma, Pomadasys stridens, Nematalosa nasus, Saurida tumbil and Upeneus doriae, and by non-commercial species such as catfishes, sharks and rays. Based on monthly bycatch-to-shrimp ratio, the percentage of the retained bycatch and the recorded shrimp landings, the total bycatch of Kuwait's shrimp fishery was estimated to be 15,704 t for the 2010/11 season. Of the total bycatch, only 2192 t (14%) was retained, while the majority 13, 512 t (86%) was discarded at sea. Of the 93 discarded species, 55 are commercially valuable species, representing 61% (8242 t) of the total discarded bycatch.

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Defining and estimating global marine fisheries bycatch

Cited by 403 publications

References 21 publications

A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action

A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action

Perspectives on the Utilization of Aquaculture Coproduct in Europe and Asia: Prospects for Value Addition and Improved Resource Efficiency

Retained and Discarded Bycatch from Kuwait’s Shrimp Fishery

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