Defining the stock structures of key commercial tunas in the Pacific Ocean II: Sampling considerations and future directions

Type Article
Date 2020-10
Language English
Author(s) Moore Bradley R.1, 2, Adams Tim3, Allain Valerie4, Bell Johann D.5, 6, Bigler Mark7, Bromhead Don8, Clark Sangaa9, Davies Campbell10, Evans Karen10, Faasili Ueta11, Farley Jessica10, Fitchett Mark12, Grewe Peter M.10, Hampton John4, Hyde John13, Leroy Bruno4, Lewis Antony14, Lorrain Anne15, Macdonald Jed I.4, Marie Amandine D.16, Minte-Vera Carolina17, Natasha Janice18, Nicol Simon4, 19, Obregon Pablo5, Peatman Thomas4, Pecoraro Carlo20, Phillip N. Bradley21, Pilling Graham M.4, Rico Ciro18, 22, Sanchez Caroline4, Scott Robert4, Scutt Phillips Joe4, Stockwell Brian18, Tremblay-Boyer Laura23, Usu Thomas24, Williams Ashley J.25, 26, Smith Niamh4
Affiliation(s) 1 : National Institute of Water and Atmospheric Research, Nelson, 7010, New Zealand
2 : Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, 7001, Australia
3 : Fisheries Management Division, Forum Fisheries Agency, Honiara, Solomon Islands
4 : Oceanic Fisheries Programme, Pacific Community (SPC), Nouméa, BP D5 98848, New Caledonia
5 : Conservation International, Center for Oceans, 2011 Crystal Drive, Suite 600, Arlington, VA, 22202, USA
6 : Australian National Centre for Ocean Resources and Security, University of Wollongong, Wollongong, NSW 2522, Australia
7 : Marshall Islands Marine Resources Authority, Majuro, Republic of the Marshall Islands
8 : Australian Fisheries Management Authority, Canberra, ACT 2609, Australia
9 : The Parties to the Nauru Agreement (PNA) Office, Majuro, 96960, Republic of the Marshall Islands
10 : CSIRO Oceans and Atmosphere, GPO Box 1538, Hobart, TAS 7001, Australia
11 : Ministry of Agriculture and Fisheries, Apia, Samoa
12 : Western Pacific Regional Fishery Management Council, Honolulu, HI, 96813, USA
13 : National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center, 8901 La Jolla Shores Dr., La Jolla, CA 92037, USA
14 : Ultramarine Consulting, Brisbane, Qld, 4068, Australia
15 : Institut de Recherche pour le Développement (IRD), Univ Brest, CNRS, Ifremer, LEMAR, F-29280, Plouzané, France
16 : ESE, Ecology and Ecosystems Health, Agrocampus Ouest, INRAE, 35042 Rennes, France
17 : Inter-American Tropical Tuna Commission, La Jolla, CA, 92037-1509, USA
18 : School of Marine Studies, The University of the South Pacific, Suva, Fiji
19 : Institute for Applied Ecology, University of Canberra, Bruce, ACT 2617, Australia
20 : Physalia-courses, Berlin, 10249, Germany
21 : National Oceanic Resource Management Authority, FSM National Government, Kolonia, Pohnpei, Federated States of Micronesia
22 : Instituto de Ciencias Marinas de Andalucía (ICMAN), Consejo Superior de Investigaciones Científicas, Campus Univ. Río San Pedro, 11510, Puerto Real, Cádiz, Spain
23 : Dragonfly Data Science, Te Aro, Wellington, 6011, New Zealand
24 : National Fisheries Authority, Port Moresby, Papua New Guinea
25 : Australian Bureau of Agricultural and Resource Economics and Sciences, Department of Agriculture, Canberra, ACT 2601, Australia
26 : Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
Source Fisheries Research (0165-7836) (Elsevier BV), 2020-10 , Vol. 230 , P. 105524 (17p.)
DOI 10.1016/j.fishres.2020.105524
WOS© Times Cited 13
Keyword(s) Tuna, Pacific Ocean, Movement, Spatial dynamics, Stock structure, Fisheries management

Delineating the stock structure of highly-mobile, wide-ranging fishes subject to exploitation is a challenging task, yet one that is fundamental to optimal fisheries management. A case in point are stocks of skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), bigeye tuna (Thunnus obesus) and albacore tuna (Thunnus alalunga) in the Pacific Ocean, which support important commercial, artisanal, subsistence, and recreational fisheries, and contribute roughly 70 % of global commercial tuna catches. Although some spatial and temporal structuring is recognised within these stocks, growing evidence from a range of approaches suggests that the stock structure of each tuna species is more complex than is currently assumed in both stock assessment and climate change models, and in management regimes. In a move towards improving understanding of the stock structure of skipjack, yellowfin, bigeye and South Pacific albacore tunas in the Pacific Ocean, an international workshop was held in Nouméa, New Caledonia, in October 2018 to review knowledge about their movement and stock structure in the region, define and discuss the main knowledge gaps and uncertainties concerning their stock structure, and develop biological sampling approaches to support the provision of this information. Here, we synthesise the discussions of this latter component. For each tuna species, we identify several general sampling considerations needed to reduce uncertainty, including i) the need for broadscale sampling in space, ideally covering each species’ distribution, targeting adults in spawning condition and adopting a phased approach; ii) the need for temporally-repeated sampling of the same geographical areas to assess stability in observed patterns over time; iii) the need to resolve patterns in spatial dynamics, such as those resulting from movements associated with the seasonal extensions of poleward flowing currents, from underlying stock structure, iv) the importance of adopting a multidisciplinary approach to stock identification, and v) the need for careful planning of logistics and coordination of sampling efforts across agencies. Finally, we present potential sampling designs that could be adopted to help overcome uncertainties around the initial identification of stocks and the provenance, mixing and proportional contributions of individuals in harvested assemblages, as well as how these uncertainties could be accounted for in fisheries management via the use of management strategy evaluation.

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Moore Bradley R., Adams Tim, Allain Valerie, Bell Johann D., Bigler Mark, Bromhead Don, Clark Sangaa, Davies Campbell, Evans Karen, Faasili Ueta, Farley Jessica, Fitchett Mark, Grewe Peter M., Hampton John, Hyde John, Leroy Bruno, Lewis Antony, Lorrain Anne, Macdonald Jed I., Marie Amandine D., Minte-Vera Carolina, Natasha Janice, Nicol Simon, Obregon Pablo, Peatman Thomas, Pecoraro Carlo, Phillip N. Bradley, Pilling Graham M., Rico Ciro, Sanchez Caroline, Scott Robert, Scutt Phillips Joe, Stockwell Brian, Tremblay-Boyer Laura, Usu Thomas, Williams Ashley J., Smith Niamh (2020). Defining the stock structures of key commercial tunas in the Pacific Ocean II: Sampling considerations and future directions. Fisheries Research, 230, 105524 (17p.). Publisher's official version : , Open Access version :