Robbing Peter to pay Paul: replacing unintended cross-taxa conflicts with intentional tradeoffs by moving from piecemeal to integrated fisheries bycatch management

Type Article
Date 2019-03
Language English
Author(s) Gilman Eric1, 2, Chaloupka Milani3, 4, Dagorn Laurent5, 12, Hall Martin6, Hobday Alistair7, Musyl Michael8, Pitcher Tony9, Poisson Francois5, Restrepo Victor10, Suuronen Petri11
Affiliation(s) 1 : Hawaii Pacific University, Honolulu, USA
2 : Indo-Pacific Tuna Program, The Nature Conservancy, San Francisco, USA
3 : Ecological Modeling Services, St. Lucia, Australia
4 : University of Queensland, St. Lucia, Australia
5 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
6 : Inter-American Tropical Tuna Commission, La Jolla, USA
7 : CSIRO Oceans and Atmosphere, Hobart, Australia
8 : Pelagic Research Group, Honolulu, USA
9 : University of British Columbia, Vancouver, Canada
10 : International Seafood Sustainability Foundation, McLean, USA
11 : Natural Resources Institute Finland, Helsinki, Finland
12 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
Source Reviews In Fish Biology And Fisheries (0960-3166) (Springer Nature), 2019-03 , Vol. 29 , N. 1 , P. 93-123
DOI 10.1007/s11160-019-09547-1
WOS© Times Cited 25
Keyword(s) Bycatch, Conflicts, Decision support tool, Fisheries-induced evolution, Holistic management, Integrated management
Abstract

Bycatch in fisheries can have profound effects on the abundance of species with relatively low resilience to increased mortality, can alter the evolutionary characteristics and concomitant fitness of affected populations through heritable trait-based selective removals, and can alter ecosystem functions, structure and services through food web trophic links. We challenge current piecemeal bycatch management paradigms, which reduce the mortality of one taxon of conservation concern at the unintended expense of others. Bycatch mitigation measures may also reduce intraspecific genetic diversity. We drew examples of broadly prescribed ‘best practice’ methods to mitigate bycatch that result in unintended cross-taxa conflicts from pelagic longline, tuna purse seine, gillnet and trawl fisheries. We identified priority improvements in data quality and in understanding ecological effects of bycatch fishing mortality to support holistic ecological risk assessments of the effects of bycatch removals conducted through semi-quantitative and model-based approaches. A transition to integrated bycatch assessment and management that comprehensively consider biodiversity across its hierarchical manifestations is needed, where relative risks and conflicts from alternative bycatch management measures are evaluated and accounted for in fisheries decision-making processes. This would enable managers to select measures with intentional and acceptable tradeoffs to best meet objectives, when conflicts are unavoidable.

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Gilman Eric, Chaloupka Milani, Dagorn Laurent, Hall Martin, Hobday Alistair, Musyl Michael, Pitcher Tony, Poisson Francois, Restrepo Victor, Suuronen Petri (2019). Robbing Peter to pay Paul: replacing unintended cross-taxa conflicts with intentional tradeoffs by moving from piecemeal to integrated fisheries bycatch management. Reviews In Fish Biology And Fisheries, 29(1), 93-123. Publisher's official version : https://doi.org/10.1007/s11160-019-09547-1 , Open Access version : https://archimer.ifremer.fr/doc/00475/58693/