Open AccessJournal Article
Trawling and by-catch: Implications on marine ecosystem
A. Biju Kumar,G. R. Deepthi +1 more
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In this paper, the authors highlight the need for adopting policies and practices that reduce the level of by-catch, the need to ensure long-term sustainability of oceanic resources, and the adoption of a precautionary approach with emphasis on reducing, and if possible avoiding discards.Abstract:
Trawling remains a controversial method of fishing due to the perceived lack of selectivity of the trawl net and the resultant capture of a huge quantity and diversity of non-target species, including endangered species such as sea turtles, coupled with its effect on the marine ecosystem. The impacts of trawling on the physical, chemical and biological environment of the marine ecosystem and the diversity and quantity of by-catch and discards remain poorly documented for the tropical waters. In India, the by-catch landed at fishing harbours are utilized mainly for the production of manure and animal feed. Further, by-catch reduction devices have not been implemented in the field. This review article, besides analysing the impact of trawling, highlights the need for adopting policies and practices that reduce the level of by-catch, the need for ecosystem-based management to ensure long-term sustainability of oceanic resources, and the adoption of a precautionary approach with emphasis on reducing, and if possible avoiding discards.read more
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Defining and estimating global marine fisheries bycatch
TL;DR: In this article, a new definition of bycatch is proposed, which is defined as "catch that is either unused or unmanaged" and applied to global marine fisheries data conservatively indicates that bycatch represents 40.4 percent of global marine catches.
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Fishery by‐catch and discards: a positive perspective from ecosystem‐based fishery management
TL;DR: In this paper, a prawn trawl fishery is used as an example to discuss the potential positive effects of discards in ecosystem-based fishery management (EBFM), and the key for managing discards is sustainability and precaution.
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Small cetacean bycatch as estimated from stranding schemes: The common dolphin case in the northeast Atlantic
Hélène Peltier,Matthieu Authier,Rob Deaville,Willy Dabin,Paul Jepson,Olivier Van Canneyt,Pierre Daniel,Vincent Ridoux +7 more
TL;DR: In this paper, the authors compare parameters and bycatch estimates of common dolphins (Delphinus delphis) provided by observer programmes in France and UK national reports and those inferred from stranding data, through two approaches.
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Structure and stability in exploited marine fish communities: quantifying critical transitions
TL;DR: This index of trophic structure indicates that warmer, species-rich, southern fish populations resist transformation from positive to negative predator–prey correlations at exploitation rates that can be double those in the colder, relatively species-poor, northern areas.
References
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Journal ArticleDOI
Disturbance of the Seabed by Mobile Fishing Gear: A Comparison to Forest Clearcutting
Les Watling,Elliott A. Norse +1 more
TL;DR: The effects of mobile fishing gear on biodiversity are most severe where natural disturbance is least prevalent, particularly on the outer continental shelf and slope, where storm-wave damage is negligible and biological processes, including growth, tend to be slow as discussed by the authors.
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Disturbance to Marine Benthic Habitats by Trawling and Dredging: Implications for Marine Biodiversity
Simon F. Thrush,Paul K. Dayton +1 more
TL;DR: In this paper, the effects of marine habitat disturbance by commercial fishing have been well documented and the potential ramifications to the ecological function of seafloor communities and ecosystems have yet to be considered.
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Modification of marine habitats by trawling activities: prognosis and solutions
TL;DR: Fishing impacts are patchily distributed according to the spatial and temporal variation in fishing effort that results from fishers' behaviour as mentioned in this paper, and the frequency and intensity of fishing disturbance varies among different habitat types.