Abstract
This report summarizes current knowledge regarding technical mitigation measures aiming to reduce unwanted catches of elasmobranchs in fishing gears. The focus of the report is technical measures that are based on elasmobranchs specific sensory organs and behaviour, and fishing gears that are used in the Swedish commercial fishery. A systematic review of scientific publications, theses and technical reports was conducted via The Bycatch Management Information System, Web of Science and Google Scholar. Search for literature on these websites was conducted with combinations of the keywords; Bycatch, mitigation, deterrents, reduction, sharks, rays and skates, and limited to literature published between 2010 and 2021. A total of 47 publications were found to be relevant from the perspective of "technical mitigation" (9 reviews and 38 publications of original research). The publications covering original research were catalogued in the Zotero reference library according to the type of stimuli tested for effect on behaviour (chemical, acoustic, visual, electromagnetic), the type of fishery the study targeted (trawl, net, hook, pot), type of experiment performed (field experiment or captivity), and results of the study. Publications where the tested stimuli gave the desired result were catalogued as "Positive", publications where the results were limited to one of several tested species or one of several tested locations were catalogued as "Limited", publications where the tested stimuli did not give the desired effect on behaviour were catalogued as "Negative". The results from the literature study showed that there is currently no general technical mitigation measure, based on the elasmobranchs specific sensory organs and behaviour, which could be used to reduce the amount of unwanted catch of elasmobranchs in the Swedish commercial fishery. The repellent effect on the fish that the technical measures intended to create, proved in all cases to be only effective for certain species or under certain conditions. Given this, the current situation in the distribution and abundance of elasmobranchs in Swedish waters and unwanted catches of these, the measure that would likely have the greatest positive effect on the stocks is, instead, an increased use of grid in fisheries using trawl
| Original language | Swedish |
|---|---|
| Publisher | Institutionen för akvatiska resurser, Sveriges lantbruksuniversitet |
| Number of pages | 85 |
| Publication status | Published - 2022 |
Publication series
| Series | Aqua reports |
|---|---|
| Number | 2022:3 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 14 Life Below Water
Keywords
- Broskfisk
- bifångst
- redskapsutveckling
- yrkesfiske
SLU series
- Aqua reports
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