Monitoring of Spanish flagged purse seine fishery targeting tropical tuna in the Indian ocean: Timeline and history

Báez, José C.; Ramos, María Lourdes; Herrera, Miguel; Murua, Hilário; Cort, José Luis; Déniz, Santiago; Rojo, Vanessa; Ruiz, Jon; Pascual-Alayón, P.J.; Muniategi, Anertz; Juan, Alejandro Pérez San; Ariz, Javier; Fernández, Felipe; Abascal, F.J.

doi:10.1016/j.marpol.2020.104094

Cited by 13 publications

(12 citation statements)

References 17 publications

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“…As tRFMO decision-making is mostly a consensus-building process, such disputes tend to weaken management measures by reducing them to the minimal set of restrictions acceptable to all, thereby preventing optimal allocation of quotas and/or fishing effort among gears to maximize economic and conservation objectives. Báez et al (2020) noted that, in the IO, the implementation of a quota for yellowfin tuna created a shift in PS effort from FSC (for large yellowfin tuna) to dFADs (for relatively smaller quantities of juvenile yellowfin tuna) to avoid reaching the yellowfin quota. This had the unintended effect of increasing juvenile yellowfin and silky shark catches (Tolotti et al, 2022).…”

Section: Allocation Between Fishing Gears/set Typesmentioning

confidence: 99%

Benefits, concerns, and solutions of fishing for tunas with drifting fish aggregation devices

Pons,

Kaplan,

Moreno

et al. 2023

Fish and Fisheries

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Drifting fish aggregating devices (dFADs) are human‐made floating objects widely used by tropical tuna purse seine (PS) fisheries to increase catch of target species. However, dFAD use has several negative impacts, including increased potential for overfishing, higher juvenile tuna catch, higher bycatch compared to other PS fishing modes, ghost‐fishing, and generation of marine litter. Based on these impacts, some stakeholders, especially environmental non‐governmental organizations and other competing fishing industries, suggest that dFADs should be completely banned. We list the pros and cons of dFAD fishing; address how to improve current management; and suggest solutions for the sustainability of dFAD fishing in the long term. A dFAD ban would lead to major changes in the availability and sourcing of tuna for human consumption and decrease the licensing revenue received by many developing states. Most importantly, we argue that tools exist today to manage for, reduce or eliminate most of the negative impacts of dFADs (e.g., bans on discards, limits on active dFADs, biodegradable non‐entangling constructions, time‐area deployment closures, recovery programs, and full data transparency, among others). Management decisions based on sound scientific reasoning are needed to address the legitimate concerns surrounding dFAD use and ensure the sustainability of both pelagic and coastal ecosystems and tropical tuna PS fisheries.

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Section: Allocation Between Fishing Gears/set Typesmentioning

confidence: 99%

Benefits, concerns, and solutions of fishing for tunas with drifting fish aggregation devices

Pons,

Kaplan,

Moreno

et al. 2023

Fish and Fisheries

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“…Historically, it has been the primary target for Japanese longline fleets since the 1950s, followed by Taiwanese, Korean and Indonesian fleets two decades later Hoyle et al, 2018;Yeh et al, 2018). Since the species is distributed in tropical and subtropical waters throughout the world's major oceans (Fonteneau, 2010), it has also been targeted by artisanal fleets (Lan et al, 2013) and industrial European purse seiners for the past 50 years (Baez et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Relative abundance of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in the tropical area of the north-eastern Indian Ocean

Setyadji

Hartaty

2022

Indian J. Fish.

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The tropical area of the north-eastern Indian Ocean has historically been a prominent fishing ground for yellowfin tunaThunnus albacares (Bonnaterre, 1788). However, low effort from either Japanese or Taiwanese fleet in the last two decadeshas driven some uncertainties in relative abundance estimates of yellowfin tuna, which affects the robustness of the currentstock analysis for an already declined population. Hence this study was carried out to bridge the research gap by utilising theIndonesian scientific observer data from 2006-2021, which covers the north-eastern Indian Ocean. A delta-lognormal modelwas adopted to fit the data, with the catch per unit effort as the response variable and year, quarter, moon phase, latitudeand longitude as known covariates. The optimal model was chosen using a backward method based on Akaike InformationCriterion (AIC) (Akaike, 1974), Bayesian Information Criterion (BIC) (Schwarz, 1978) and the values of the coefficientof determination (R2). In general, the relative abundance of yellowfin tuna remained at a very low level, with an apparentdeclining trend in the first decade, followed by a slight sign of recovery in the past three years. However, the increasing trendwas overshadowed by uncertainties, likely caused due to natural variation and low coverage in some years. Although theseries was considered short, it managed to picture the dynamics of the abundance of yellowfin tuna in the tropical area of thenorth-eastern Indian Ocean, which is essential for conducting a more robust harvest strategy evaluation. Keywords: Declining stock, Fisheries-independent data, Highly migratory, Relative abundance, Scientific observer

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“…The tropical tuna purse seine fishery has significantly increased in the Eastern Atlantic Ocean (EAO) and Western Indian Ocean (WIO) since its development in the 1960s and 1980s, respectively ( Fonteneau and Marcille 1988 , Báez et al 2020 ). In both oceans, this fishery is dominated by the EU purse seine fleet, in particular under the Spanish and French flags ( Chassot et al 2013 , Pascual-Alayón et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

“…In both oceans, this fishery is dominated by the EU purse seine fleet, in particular under the Spanish and French flags ( Chassot et al 2013 , Pascual-Alayón et al 2019 ). In 2020, this fleet was composed of about eighty large-scale purse seiners in the EAO and WIO ( Báez et al 2020 , Floch et al 2020 ). Vessels target the three principal commercial tropical tuna species: yellowfin tuna ( Thunnus albacares , YFT), skipjack tuna ( Katsuwonus pelamis , SKJ) and bigeye tuna ( Thunnus obesus , BET).…”

Section: Introductionmentioning

confidence: 99%

Tunabio: biological traits of tropical tuna and bycatch species caught by purse seine fisheries in the Western Indian and Eastern Central Atlantic Oceans

Guillou¹,

Bodin²,

Chassot³

et al. 2022

BDJ

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Along with the development of the tropical tuna purse-seine fishery from the 1960s in the Atlantic Ocean and from the 1980s in the Indian Ocean, many projects and studies have been conducted to improve knowledge about the biology, migrations and dynamics of the stocks of target and non-target (i.e. bycatch) species taken in these fisheries. Since the 2000s, the European Union (EU) has been supporting Member States in the collection of biological data on species caught by their purse seine and pole and line fisheries, thus making it possible to have a long-term series of data. Biological data have never been saved by the different tuna commissions, unlike the catches by species and sizes by areas and periods. However, these data are essential to monitor the status of the fisheries and fuel the assessment models used by the tuna Regional Fisheries Management Organisations (tRFMOs) for the sustainable management and conservation of the fish stocks under their mandate. We combined historical (1974-1999) and current (2003-2020) datasets on the biology of tropical tunas and bycatch fish caught by large-scale purse seiners in the Eastern Atlantic Ocean (EAO) and Western Indian Ocean (WIO). The resulting Tunabio database is presented in the present data paper and contains all available morphometric and biological data collected on more than 80,000 fish individuals.

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Monitoring of Spanish flagged purse seine fishery targeting tropical tuna in the Indian ocean: Timeline and history

Cited by 13 publications

References 17 publications

Benefits, concerns, and solutions of fishing for tunas with drifting fish aggregation devices

Benefits, concerns, and solutions of fishing for tunas with drifting fish aggregation devices

Relative abundance of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in the tropical area of the north-eastern Indian Ocean

Tunabio: biological traits of tropical tuna and bycatch species caught by purse seine fisheries in the Western Indian and Eastern Central Atlantic Oceans

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