Conceptual and practical advances in fish stock delineation

Pita, Alfonso; Casey, John; Hawkins, Stephen J.; Ruiz-Villarreal, Manuel; Gutiérrez, María-José; Cabral, Henrique N.; Carocci, Fabio; Abaunza, Pablo; Pascual, Santiago; Presa, Pablo

doi:10.1016/j.fishres.2015.10.029

Cited by 47 publications

(40 citation statements)

References 56 publications

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“…Stock identification is an essential component of modern fisheries management (Pita et al 2016). Although several definitions of 'stock' have been used in the fisheries literature, the stock concept essentially describes demographically discrete units of fish assumed to be homogeneous for particular management purposes (Begg et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Otolith microchemistry: a useful tool for investigating stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean

Artetxe-Arrate

Fraile

Crook

et al. 2019

Mar. Freshwater Res.

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A better understanding of the stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean is needed to ensure the sustainable management of the fishery. In this study, carbon and oxygen stable isotopes (δ13C and δ18O) and trace elements (138Ba, 55Mn, 25Mg and 88Sr) were measured in otoliths of young-of-the-year (YOY) and age-1 yellowfin tuna collected from the Mozambique Channel and north-west Indian Ocean regions. Elemental profiles showed variation in Ba, Mg and Mn in YOY otolith composition, but only Mn profiles differed between regions. Differences in YOY near-core chemistry were used for natal-origin investigation. Ba, Mg and Mn were sufficiently different to discriminate individuals from the two regions, in contrast with carbon and oxygen stable isotopes. A linear discriminant analysis resulted in 80% correct classification of yellowfin tuna to their natal origin. Classification success increased to 91% using a random forest algorithm. Finally, a unique larval source was detected among age-1 yellowfin tuna. The signal of these fish resembled that of YOY from a north-west Indian Ocean origin, highlighting the importance of local production. The present study supports the use of otolith chemistry as a promising approach to analyse yellowfin stock structure in the Indian Ocean.

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Section: Introductionmentioning

confidence: 99%

Otolith microchemistry: a useful tool for investigating stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean

Artetxe-Arrate

Fraile

Crook

et al. 2019

Mar. Freshwater Res.

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“…At this time, our parasite data from Pacific sardine cannot provide quantitative information on migration rates, nor do they indicate distinct stock structure, but they do elucidate patterns of migration, residency, and periodic local recruitment and indicate that a greater variability in annual migratory behavior of Pacific sardine should be considered. A holistic inclusion of multidisciplinary approaches and techniques (as reviewed in Baldwin et al, 2012;Catalano et al, 2014;Pita et al, 2016) that advances our understanding of economically and ecologically important species should improve management of Pacific sardine, even in the absence of genetically distinct stock isolation. Examination of multiple biological metrics of Pacific sardine with testing of habitat prediction models should help elucidate migration patterns and improve estimates of migration.…”

Section: Management Implicationsmentioning

confidence: 99%

“…The technique of using parasites has limitations, such as time-consuming examination of hosts for internal parasites, a potential need for molecular techniques for correct identification, and a lack of adequate information on a parasite's ecology and biology (reviewed in Abaunza, 1998, 2014). Despite these limitations, this technique has often been used by scientific and fisheries agencies (Pita et al, 2016), and by 2014 more than 290 peer-reviewed manuscripts had been published on the topic (Timi and MacKenzie, 2015).…”

mentioning

confidence: 99%

Use of parasites to clarify residency and migration patterns of Pacific sardine (Sardinops sagax) in the California Current

Jacobson¹,

Baldwin²,

Banks³

et al. 2019

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“…Adding other major environmental and biological factors, such as hydrological trends between the marine and freshwaters, sedimentation dynamics in the lagoon, species interaction and the ecosystem carrying capacity, would enhance modeling precision [37][38][39][40][41][42]. Also, a comparative analysis between the quota-based approach of Aveiro and other case studies focusing on licensing and protected zoning areas would be of major value for the better evaluation of the study findings.…”

Section: Does the Static Bioeconomic Analysis Support The Quota Intromentioning

confidence: 99%

Introducing a Regulatory Policy Framework of Bait Fishing in European Coastal Lagoons: The Case of Ria de Aveiro in Portugal

Xenarios

Queiroga

Lillebø

et al. 2018

Fishes

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Abstract:The harvesting of bait through digging in coastal mudflats is practiced for recreational and commercial purposes in European coastal systems including the Ria de Aveiro coastal lagoon on the northwest Atlantic coast of Portugal. The scale of harvesting in the Ria de Aveiro has recently increased due to the current economic climate in Portugal, with targeting of the polychaete, Diopatra neapolitana species or "casulo" as it is widely known in the Aveiro region. The national authorities have attempted to control casulo digging by issuing a regulation (Ordinance) in 2014 on the maximum daily catch limit to be caught by each individual. The daily catch limit is intended to represent the Maximum Sustainable Yield (MSY) for casulo beyond which overfishing will occur. The monitoring of the regulatory measures is expected to be conducted through on-site inspections in the digging areas. However, weak law enforcement was noticed, while there is also controversy over the daily catch limit (quota) stipulated by the Ordinance. To this end, the current study attempted to assess digging activities through remote monitoring and random inspections for a better policy enforcement of the national regulation. In addition, different harvesting scenarios were employed through a simplified bioeconomic model to attribute the current and future harvesting trends of bait digging in Aveiro coastal lagoon. The study findings indicate that remote monitoring coupled with some onsite interviews could be a more effective approach for the implementation of the current bait digging policy. Further, the results point to a distinctive discrepancy between the daily catch amount (MSY) introduced by the national legislation and the study findings which should be further scrutinized. The diggers seem to have reached the sustainable harvest identified by the present research. The current economic hardship in Portugal and the low profitability in similar employment sectors will possibly attract more diggers and increase harvesting in the near future. An increased harvest would likely trigger overfishing of D. neapolitana with unknown consequences for the population of the species as well as the aquatic ecosystem. The socio-economic and environmental effects are yet to be further clarified with more detailed data and advanced modeling techniques to ensure the sustainability of the activity.

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Conceptual and practical advances in fish stock delineation

Cited by 47 publications

References 56 publications

Otolith microchemistry: a useful tool for investigating stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean

Otolith microchemistry: a useful tool for investigating stock structure of yellowfin tuna (Thunnus albacares) in the Indian Ocean

Use of parasites to clarify residency and migration patterns of Pacific sardine (Sardinops sagax) in the California Current

Introducing a Regulatory Policy Framework of Bait Fishing in European Coastal Lagoons: The Case of Ria de Aveiro in Portugal

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