Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean

Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean

The shortbill spearfish (Tetrapturus angustirostris) is a rare, large pelagic fish that inhabits the tropical and temperate waters of the Pacific and Indian Oceans, and it is seldom incidentally captured by the purse seine and longline tuna fleets. It is listed on the International Union for the Con...

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Autores principales: Marín-Enríquez, Emigdio, Muhlia-Melo, Arturo
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2018
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727
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record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Marín-Enríquez, Emigdio
Muhlia-Melo, Arturo
spellingShingle Marín-Enríquez, Emigdio
Muhlia-Melo, Arturo
Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
author_facet Marín-Enríquez, Emigdio
Muhlia-Melo, Arturo
author_sort Marín-Enríquez, Emigdio
title Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
title_short Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
title_full Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
title_fullStr Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
title_full_unstemmed Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean
title_sort incidental catch of the rare shortbill spearfish (tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical pacific ocean
description The shortbill spearfish (Tetrapturus angustirostris) is a rare, large pelagic fish that inhabits the tropical and temperate waters of the Pacific and Indian Oceans, and it is seldom incidentally captured by the purse seine and longline tuna fleets. It is listed on the International Union for the Conservation of Nature red list as data deficient, with the population likely decreasing. The main objective of this paper is to contribute basic knowledge of the species catch rate, spatial distribution, temporal trends, and association with different types of fishing sets. A 23-year (1993–2015) database of incidental catches was analyzed; data was gathered by the observers from the Inter-American Tropical Tuna Commission aboard vessels from the international tuna purse seine fleet in the eastern tropical Pacific Ocean. We also analyzed time series of sea surface temperature (SST) from different Niño regions, and 2 climatic indices, the Oceanic Niño Index (ONI) and the Pacific Decadal Oscillation (PDO). The database included information from a total of 422,970 sets; of these, ~1% resulted in a catch of 687 spearfish. Most incidental catches occurred in waters close to the equator (10ºS to 10°N), with no apparent seasonal distribution pattern. Time-series analyses showed a significant positive trend in incidental catch (~4% per year). Weak negative correlations of incidental catches with El Niño SST and ONI suggest that spearfish prefer cool waters in zones near the Equator. The PDO seemed to be more important to spearfish than El Niño events, and it is likely playing an important role in the positive trend of incidental catches. Most spearfish catches were associated with sets made on floating objects, mainly south of the equator and west of 100ºW, highlighting the oceanic behavior of this species.
publisher Iniversidad Autónoma de Baja California
publishDate 2018
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727
_version_ 1792606972470624256
spelling oai:cienciasmarinas.com.mx:article-27272024-03-02T20:09:11Z Incidental catch of the rare shortbill spearfish (Tetrapturus angustirostris) by the tuna purse seine fleet in the eastern tropical Pacific Ocean Captura incidental del poco común marlín trompa corta (Tetrapturus angustirostris) por la flota atunera con redes de cerco en el océano Pacífico oriental tropical Marín-Enríquez, Emigdio Muhlia-Melo, Arturo The shortbill spearfish (Tetrapturus angustirostris) is a rare, large pelagic fish that inhabits the tropical and temperate waters of the Pacific and Indian Oceans, and it is seldom incidentally captured by the purse seine and longline tuna fleets. It is listed on the International Union for the Conservation of Nature red list as data deficient, with the population likely decreasing. The main objective of this paper is to contribute basic knowledge of the species catch rate, spatial distribution, temporal trends, and association with different types of fishing sets. A 23-year (1993–2015) database of incidental catches was analyzed; data was gathered by the observers from the Inter-American Tropical Tuna Commission aboard vessels from the international tuna purse seine fleet in the eastern tropical Pacific Ocean. We also analyzed time series of sea surface temperature (SST) from different Niño regions, and 2 climatic indices, the Oceanic Niño Index (ONI) and the Pacific Decadal Oscillation (PDO). The database included information from a total of 422,970 sets; of these, ~1% resulted in a catch of 687 spearfish. Most incidental catches occurred in waters close to the equator (10ºS to 10°N), with no apparent seasonal distribution pattern. Time-series analyses showed a significant positive trend in incidental catch (~4% per year). Weak negative correlations of incidental catches with El Niño SST and ONI suggest that spearfish prefer cool waters in zones near the Equator. The PDO seemed to be more important to spearfish than El Niño events, and it is likely playing an important role in the positive trend of incidental catches. Most spearfish catches were associated with sets made on floating objects, mainly south of the equator and west of 100ºW, highlighting the oceanic behavior of this species. El marlín trompa corta (Tetrapturus angustirostris) es un pez pelágico grande poco común que habita las aguas tropicales y templadas del océano Pacífico y del océano Índico, y rara vez es capturado de manera incidental por las flotas atuneras de cerco y de palangre. Está categorizado en la lista roja de la Unión Internacional para la Conservación de la Naturaleza (UICN) como con datos insuficientes y una disminución probable de su población. El objetivo principal de este trabajo es contribuir al conocimiento básico sobre su tasa de captura, distribución espacial, tendencias temporales y asociación con diferentes tipos de lances pesqueros. Se analizó una base de datos de 23 años (1993–2015), la cual fue recopilada por observadores de la Comisión Interamericana del Atún Tropical a bordo de los buques de la flota internacional de pesca de atún con cerco en el océano Pacífico oriental tropical. También analizamos las series de tiempo de la temperatura superficial del mar (TSM) de diferentes regiones influenciadas por eventos El Niño y 2 índices climáticos, el índice oceánico de El Niño (ION) y el índice de la Oscilación Decadal del Pacífico (ODP). La base de datos incluyó un total de 422,970 lances; de estos, ~1% resultó en una captura de 687 individuos de marlín trompa corta. La mayor parte de la captura incidental ocurrió en aguas cercanas al ecuador (10ºS a 10ºN) sin ningún patrón de distribución estacional aparente. Los análisis de las series de tiempo mostraron que existe una tendencia positiva significativa en la captura incidental (~4% por año). Las correlaciones negativas débiles de las capturas incidentales con la TSM de El Niño y con ION sugieren que el marlín trompa corta prefiere las aguas templadas de las zonas cercanas al ecuador. El ODP pareció ser más importante para el marlín trompa corta que los eventos El Niño, y seguramente desempeña un papel importante en la tendencia positiva de la captura incidental. La mayor parte de la captura de marlín trompa corta está relacionada con lances realizados sobre objetos flotantes, principalmente al sur del ecuador y al oeste de 100ºW, lo cual resalta el comportamiento oceánico de esta especie. Iniversidad Autónoma de Baja California 2018-03-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727 10.7773/cm.v44i1.2727 Ciencias Marinas; Vol. 44 No. 1 (2018); 21-32 Ciencias Marinas; Vol. 44 Núm. 1 (2018); 21-32 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727/420420430 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727/420421000 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2727/420420612 Copyright (c) 2018 Ciencias Marinas https://creativecommons.org/licenses/by/4.0

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