Mitigating unaccounted fishing mortality from gillnets and traps

Uhlmann, Sebastian S. and Broadhurst, Matt K. (2015) Mitigating unaccounted fishing mortality from gillnets and traps. Fish and Fisheries, 16 2: 183-229. doi:10.1111/faf.12049


Author Uhlmann, Sebastian S.
Broadhurst, Matt K.
Title Mitigating unaccounted fishing mortality from gillnets and traps
Journal name Fish and Fisheries   Check publisher's open access policy
ISSN 1467-2979
1467-2960
Publication date 2015-06-01
Sub-type Article (original research)
DOI 10.1111/faf.12049
Volume 16
Issue 2
Start page 183
End page 229
Total pages 47
Place of publication West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2016
Language eng
Abstract Gillnets and traps often are considered to have fewer holistic environmental impacts than active fishing gears. However, in addition to the targeted catches, gillnets and traps still cause unwanted mortalities due to (i) discarding, (ii) ghost fishing of derelict gear, (iii) depredation, (iv) escaping or dropping out of gear, (v) habitat damage, and potentially (vi) avoiding gear and predation and (vii) infection of injuries sustained from most of the above. Population-level concerns associated with such ‘unaccounted fishing mortalities’ from gillnets and traps have been sufficient to warrant numerous attempts at mitigation. In this article, we reviewed relevant research efforts, locating 130 studies in the primary literature that concomitantly quantified mortalities and their resolution through technical modifications, with the division of effort indicating ongoing concerns. Most studies (85) have focused on discard mortality, followed by ghost-fishing (24), depredation (10) and escape (8) mortalities. The remaining components have been poorly studied (3). All problematic mortality components are affected by key biological (e.g. species), technical (e.g. fishing mechanisms) and/or environmental (e.g. temperature) factors. We propose that these key factors should be considered as part of a strategy to reduce impacts of these gears by first assessing modifications within and then beyond conventional configurations, followed by changes to operational and handling practices. Justification for this three-tiered approach is based not only on the potential for cumulative reduction benefits, but also on the likely ease of adoption, legislation and compliance.
Keyword By-catch
Discards
Entanglement gears
Entrapment gears
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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