Overview of tuna fisheries, stock status and management framework in the Western and Central Pacific Ocean

Allain, Valérie; Pilling, Graham M.; Williams, P.; Harley, Shelton J.; Nicol, Simon; Hampton, John

doi:10.4000/books.pacific.423

Cited by 12 publications

(18 citation statements)

References 2 publications

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“…This effect was observed for CPUE during ENSO events and also during times . The observed distribution pattern reflects the dominant BET and YFT in LL catch in the EPO and WCPO, respectively (Harley et al, 2014;IATTC, 2020IATTC, , 2019Lehodey et al, 2018;NMFS & WPFMC, 2020;Williams & Reid, 2018). YFT spawning and larval densities (Lehodey et al, 2018(Lehodey et al, , 2003.…”

Section: Discussionmentioning

confidence: 88%

“…The tropical Pacific is strongly affected by the El Niño-Southern Oscillation (ENSO) that drives the surface temperature variability on the large scale, affecting the distribution and biomass of tunas (Lehodey et al, 2011). In the tropical Pacific, longline fisheries predominantly target adult BET and YFT; BET dominates the catch in the EPO (east of 150 W) and YFT in the WCPO (west of 150 W) (Harley et al, 2014;IATTC, 2020IATTC, , 2019Lehodey et al, 2018;National Marine Fisheries Service [NMFS] & Western Pacific Regional Fishery Management Council [WPFMC], 2020; Williams & Reid, 2018). A spatial environmental population dynamic model, SEAPODYM (Lehodey et al, 2003(Lehodey et al, , 1998, suggests El Niño events in the WCPO have a positive effect on tropical YFT recruitment (Lehodey et al, 2003) that could be the result of increased availability of forage due to bottomup forcing in response to increased upwelling (Lehodey et al, 1997).…”

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confidence: 99%

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Influence of El Niño‐Southern Oscillation on bigeye and yellowfin tuna longline catch per unit effort in the equatorial Pacific

Domokos

2023

Fisheries Oceanography

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Bigeye tuna (BET) and yellowfin tuna (YFT) are economically important target species of pelagic fisheries worldwide, especially for tropical Pacific nations whose economies and food sources are heavily affected by commercial and sustenance tuna fishing. The El Niño‐Southern Oscillation (ENSO) has a strong effect on the oceanographic conditions in the equatorial Pacific, including BET and YFT equatorial habitat and fishing grounds. For optimal fisheries management, the effects of environmental variability such as ENSO on the stocks and on the performance of fisheries must be known and predictable. However, besides some model predictions, the effects of ENSO on these two tuna species are not well understood. In this study, I investigate the statistical relationships between past ENSO conditions and equatorial fisheries using the Multivariate ENSO Index, sea surface temperature (SST), and catch and effort records from the longline fisheries in the region. Results of this study indicate that El Niño events have both delayed and concurrent positive effects on BET and YFT catch per unit effort (CPUE). The delayed positive ENSO effect on CPUE is hypothesized to be the result of enhanced recruitment acting via different mechanisms in the west than in the east. The concurrent positive effects on CPUE could be due to catchability, abundance, and/or vertical distribution of BET and YFT relative to fishing gear and require further investigation. Further exploration of the mechanisms that may underlie the results presented here could lead to predictability of CPUE of these two tuna species.

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Section: Discussionmentioning

confidence: 88%

mentioning

confidence: 99%

Influence of El Niño‐Southern Oscillation on bigeye and yellowfin tuna longline catch per unit effort in the equatorial Pacific

Domokos

2023

Fisheries Oceanography

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“…This region contains 15% of all seamounts but 37% of total drifting longlining activity within seamount buffer zones. Longlining operations in this region primarily target higher value tuna species such as skipjack ( Katsuwonus pelamis , Scombridae), yellowfin ( Thunnus albacares , Scombridae), bigeye ( Thunnus obesus , Scombridae) and albacore ( Thunnus alalunga , Scombridae), which account for up to 75% of total catch with the presence of some seamounts thought to increase catch rates by nearly 50% (Allain et al, 2016; Morato et al, 2010b ) . A study of catch data for the Pacific Island Group estimated that seamount fisheries accounted for 35 thousand tonnes of tuna catch annually with population declines in yellowfin and bigeye tuna possibly forcing fishers to target areas of aggregation, such as seamounts, to maintain catch rates (Chollett et al, 2020; Erisman et al, 2011; Mackinson et al, 1997; Morato et al, 2010b; Post & Squires, 2020).…”

Section: Discussionmentioning

confidence: 99%

Monitoring global fishing activity in proximity to seamounts using automatic identification systems

2022

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“…Since 2014, Surprise Island has been included in the Mer de Corail' Natural Park (Martin & Lecren, 2014), which resulted in the prohibition of entering or engaging in any activity related to hunting and fishing on the islet. Moreover, local anthropogenic pressure is particularly low in terms of fishing efforts (e.g., Allain et al., 2016) and there is limited plastic pollution (Berr et al., 2020).…”

Section: Methodsmentioning

confidence: 99%

Recovery of insular seabird populations years after rodent eradication

Philippe‐Lesaffre

Thibault

Caut

et al. 2023

Conservation Biology

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Seabirds have been particularly affected by invasive alien species (IAS), which has led to the implementation of numerous eradication campaigns for the conservation of these keystone and highly vulnerable species. Although the benefits of IAS eradications for seabird conservation have been demonstrated, the recovery kinetics of different seabird populations on islands after eradication remains poorly evaluated. Here we present the results of an original long-term monitoring of the number of breeding pairs of seven seabird species on a small atoll, Surprise Island, New Caledonia (southwestern tropical Pacific). This long-term monitoring consists in a yearly core survey of the marine avifauna of the island conducted from 4 years before to 4 years after rodent eradication (conducted in 2005) combined with multiple one-time surveys from ∼10 years before and ∼15 years after eradication. This study was designed to evaluate how different seabird species responded to the eradication of invasive rodents in an insular environment. We found that three species responded positively to eradication with differences in lag-timing and sensitivity. The number of breeding pairs increased for two species in the four year post eradication due to immigration while one species showed a longer response time with an increase in pairs more than 10 years after eradication. Furthermore, we showed that long-term sampling is necessary to observe the responses of the seabird populations on the island. Our study confirms the positive effects of IAS eradication on seabirds and emphasizes both the importance of mid/long-term pre-and posteradication surveys to decipher the mechanisms of seabird recovery and confirm the benefits of eradication for conservation purposes.

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Overview of tuna fisheries, stock status and management framework in the Western and Central Pacific Ocean

Cited by 12 publications

References 2 publications

Influence of El Niño‐Southern Oscillation on bigeye and yellowfin tuna longline catch per unit effort in the equatorial Pacific

Influence of El Niño‐Southern Oscillation on bigeye and yellowfin tuna longline catch per unit effort in the equatorial Pacific

Monitoring global fishing activity in proximity to seamounts using automatic identification systems

Recovery of insular seabird populations years after rodent eradication

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