Standardization of small purse seiner fishing effort and its relation to fishing grounds in the eastern tropical sector of the Eastern Pacific Ocean

Isaza-Toro, Estefania; Giraldo, Alan; Selvaraj, John Josephraj; Ortíz-Ferrín, Omar Olimpo y

doi:10.1016/j.rsma.2020.101432

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…The absence of information for 2012 may be related to the inactivity of the CFOP due to administrative changes within the National Authority of Aquaculture and Fisheries, a situation that interrupted the continuity in the monitoring of fisheries in Colombia. Other consequences of these administrative changes have been reported by Díaz‐Ochoa & Quiñones (2008), Herrón et al (2018) and Isaza‐Toro et al (2020), but the most significant change in the management of FADs was the revocation of Resolution 2,413 of 2008 of the Colombian Agricultural Institute. This resolution explicitly prohibited the use of FADs in tuna purse‐seine operations in Colombia's exclusive economic zone.…”

Section: Discussionmentioning

confidence: 86%

Fish aggregating devices in the eastern tropical Pacific marine corridor, according to the Colombian Fisheries Observer Program

Isaza-Toro

Selvaraj

Giraldo

et al. 2021

Aquatic Conservation

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1. Fish aggregating devices (FADs) are floating objects that facilitate the aggregation of fish; those that aggregate pelagic species such as tunas are of particular interest for artisanal and industrial fisheries.2. Due to the increasing use of these devices worldwide, bodies responsible for the administration and management of fishery resources have proposed control and surveillance activities focused on the use of such devices. To achieve this, it is essential to have access to quality information, which is usually obtained through on-board observer programmes such as the Colombian Fisheries Observer Program. 3. Based on the historical records of this programme, and for the first time, the spatial-temporal distribution of the FADs in the eastern tropical sector of the Eastern Pacific Ocean is presented, analysing 166 records of tuna fishing operations carried out between 2009 and 2015. Of the 2,328 sets identified in the records, 957 corresponded to sets on FADs, of which 80.56% were effective and caught 12,246 tons of tuna. 4. The number of sets of FADs increased over time, representing approximately 86.9% of the sets recorded in 2015, compared to 4.8% of this type of set recorded in 2009, with the Eastern Tropical Pacific Marine Corridor being the area of greatest concentration of sets. 5. Considering that the Eastern Tropical Pacific Marine Corridor was designed to promote the conservation and sustainable use of biological diversity in the Eastern Tropical Pacific, this study highlights the need to include as a researchpriority, the potential effect that aggregation devices may have on the biological connectivity processes present in the corridor, as well as on the dynamics of large pelagic fish populations of commercial interest.6. In terms of management of FADs, it is recommended that a precautionary approach be adopted and that regulations related to the maximum number of FADs per vessel be adjusted according to their Inter-American Tropical Tuna Commission class, in addition to assigning a maximum number of sets per vessel.

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Section: Discussionmentioning

confidence: 86%

Fish aggregating devices in the eastern tropical Pacific marine corridor, according to the Colombian Fisheries Observer Program

Isaza-Toro

Selvaraj

Giraldo

et al. 2021

Aquatic Conservation

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“…Además, se aplica un filtro temporal para seleccionar solo aquellos correspondientes a la misma ventana de tiempo de la información del POPC, lo anterior por ausencia de registros en años previos al 2009 y no tener acceso a información posterior al 2015. Para unificar los dos conjuntos preliminares de datos (POPC y GBIF), se tabuló la información en hojas de cálculo siguiendo la metodología de Isaza et al (2020), incluyéndose coordenadas y fecha de captura, bandera de la embarcación e individuos totales capturados, generándose finalmente un conjunto de datos unificado, exportado en formato csv (Comma-Separated Values).…”

Section: Materiales Y Métodosunclassified

“…Aunque los modelos se generaron a partir de ocurrencias distribuidas mundialmente, para este estudio se hizo énfasis en la distribución potencial del dorado en el POT, zona que presenta características oceanográficas que favorecen la diversidad biológica (Cortés, 2012), afloramientos (D'Croz y O'Dea, 2007) y soportan importantes pesquerías industriales y caladeros de pesca (Isaza-Toro et al, 2020). Los mapas de distribución potencial generados en condiciones actuales mostraron que la zona de mayor idoneidad ambiental (entre 0.65 y 0.80) corresponde a una región transfronteriza Colombia-Ecuador que se extiende desde 82° W hasta aguas internacionales.…”

Section: Modelo De Distribución Potencial Y Variaciones Debidas Al Ca...unclassified

Modelo de distribución geográfica del pez Coryphaena hippurus (Perciformes: Coryphaenidae) según el cambio climático en el Pacífico Oriental Tropical

Isaza-Toro,

Selvaraj,

Giraldo

2024

Rev. Biol. Trop.

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Introducción: Coryphaena hippurus es una especie migratoria de interés comercial, que se encuentra en ambientes tropicales y subtropicales, prefiriendo zonas con un rango de temperatura entre 21 y 30 °C y salinidad cercana a 31 ppt. Aunque la tendencia poblacional del dorado es estable, la pesquería de este recurso está aumentando y ocupa importantes posiciones en la economía de países costeros del Pacífico Oriental Tropical, evidenciándose la necesidad de diseñar y fortalecer estrategias de conservación y mejorar el aprovechamiento de este recurso. Dada su ubicación en ambientes tropicales y subtropicales, la disponibilidad y distribución de este recurso podría verse afectado a futuro por el cambio climático. Objetivo: Analizar la distribución potencial actual y futura de C. hippurus bajo condiciones de cambio climático. Métodos: Se emplearon 10 algoritmos para modelar la distribución potencial e idoneidad de hábitat actual para C. hippurus a partir de la temperatura superficial del mar, la salinidad y velocidad de las corrientes, posteriormente se proyectaron estos resultados según el escenario de cambio climático más extremo. Resultados: Hubo buenos desempeños con todos los algoritmos empleados, pero se escogió el modelo generado con BIOCLIM (AUC: 0.89) pues además resuelve el inconveniente del sesgo espacial y temporal hallado en los registros de la especie. La región de mayor idoneidad de hábitat para C. hippurus coincide con los frentes oceánicos del Pacífico Oriental Tropical. En condiciones futuras de cambio climático extremo, el modelo de distribución de la especie indica una contracción, reubicación y expansión de hábitat hacia el sur de la línea ecuatorial. Conclusiones: En condiciones de cambio climático extremo, el modelo de distribución para C. hippurus sugiere un proceso de tropicalización de los ecosistemas marinos en el Pacífico Oriental Tropical para el año 2100.

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“…3A, d), which could be overlapped with the Mahi-Mahi (Coryphaena hippurus) season of some artisanal long-liners that may go offshore, and overlaps with the IMND Cabo Manglares, Bajo Mira and Frontera (declared by Resolution 2299 of 2017). The latter are presumably influenced by high primary productivity due to the rivers' discharge into the sea, bringing plenty of nutrients (Restrepo-Angel, 2008;Isaza et al, 2020). The IMNDs mentioned are IUCN category VI protected areas allowing sustainable use.…”

Section: Spatiotemporal Analysis Of the Tuna Purse Seine Fishery In T...mentioning

confidence: 99%

“…Isaza et al (2020) analyzed the spatial distribution of the standardized catch effort associated with the foreign purse seine tuna fleet that operated in the eastern tropical sector of the Eastern Pacific Ocean between 2009 and 2015, as monitored by the FOPP(2009, 2010, 2011) and data from the CFOP…”

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confidence: 99%

Descriptive and Spatiotemporal Analysis of the Tuna Purse Seine Fishery in the Colombian Pacific Ocean

Puentes¹,

Hernández²,

Ardila³

et al. 2022

JBNS

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The tuna purse seine fishery is a large-scale fishery in the Colombian Pacific Ocean (CPO). This study aims to perform a descriptive and spatiotemporal analysis of the purse-seine tuna fishery in the CPO to provide new knowledge and alternatives for its domestic management. Georeferenced data (2000 -2019) allowed the analysis by species, vessel carrying capacity, and fishing method. Yellowfin Tuna-YFT (Thunnus albacares) and Skipjack Tuna-SKJ (Katsuwonus pelamis) were the most captured species. The Not Associated method (NoAs) was mostly used in the first decade, while the method associated with Dolphins (DEL) was mainly used in the second. The natural floating objects method (NAT) was the least used method, while the fish aggregating device method (FAD) was the most used. There was no clear annual catch pattern with discrete peaks in May and October. The average number of sets per year was 1,230, and only 8.7% of the tuna was captured by the Colombian tuna fleet in the CPO. Capture per Unit Effort oscillated from 14.9 to 27.2 t/effective set/ year. The spatiotemporal analysis showed four main fishing grounds; YFT was mainly fished in the northwestern zone and near the coast, while SKJ was captured in almost all CPO; the main fishing activity is performed by the largest vessels, showing significantly higher tuna catches. The DEL method is used mainly in the central area and towards the coast, while FAD is used in most of the CPO. It is important to work on the FAD regulation, small tuna discards, increase the fishing observer coverage, satellite, and onthe-field vessel monitoring, and characterize environmental conditions related to tuna fishing. Furthermore, tuna fishing should be considered in the initiatives to establish new protected areas in the CPO.

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Standardization of small purse seiner fishing effort and its relation to fishing grounds in the eastern tropical sector of the Eastern Pacific Ocean

Cited by 3 publications

References 15 publications

Fish aggregating devices in the eastern tropical Pacific marine corridor, according to the Colombian Fisheries Observer Program

Fish aggregating devices in the eastern tropical Pacific marine corridor, according to the Colombian Fisheries Observer Program

Modelo de distribución geográfica del pez Coryphaena hippurus (Perciformes: Coryphaenidae) según el cambio climático en el Pacífico Oriental Tropical

Descriptive and Spatiotemporal Analysis of the Tuna Purse Seine Fishery in the Colombian Pacific Ocean

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