TY - JOUR
T1 - Spatial segregation of striped marlin (Kajikia audax) by size in the eastern Pacific Ocean
AU - Acosta-Pachón, Tatiana A.
AU - Muzquiz-Villalobos, Mariana L.
AU - Ortega-García, Sofia
AU - Martínez-Rincón, Raúl O.
N1 - Publisher Copyright:
© 2018 John Wiley & Sons Ltd
PY - 2019/3
Y1 - 2019/3
N2 - Striped marlin (Kajikia audax) is an epipelagic fish distributed in oceanic and coastal waters of the Pacific Ocean. This species is usually found in warm and coastal waters with high primary productivity. The main goal of this study was to describe the spatial segregation of striped marlin by average Eye-Fork length (EFL) in the eastern Pacific Ocean (EPO) and its relationship with environmental variables using EFL data obtained from tuna purse-seining and Generalized Additive Models (GAMs). The model suggested that larger individuals of striped marlin were more likely to be found in waters with high Chlorophyll-a concentration (>2 mg/m 3 ) and with temperatures lower than 25°C, within a region known as the “cold tongue” and the Humboldt current system, while smaller individuals were more likely to be found in warmer and low productive areas within a region known as the “warm pool of the EPO.” We observed that set type caused a large variation on average EFL of striped marlin; larger fish were captured in sets associated with floating objects (natural and manmade), while smaller fish were captured in sets associated with dolphins. Despite this, our findings suggest that striped marlin has a latitudinal gradient in average EFL; larger individuals occurred predominantly south of 10°N, while smaller ones occurred predominantly in coastal waters between 10°N and 20°N, thus demonstrating a spatial segregation of the species affected by its maturity stage.
AB - Striped marlin (Kajikia audax) is an epipelagic fish distributed in oceanic and coastal waters of the Pacific Ocean. This species is usually found in warm and coastal waters with high primary productivity. The main goal of this study was to describe the spatial segregation of striped marlin by average Eye-Fork length (EFL) in the eastern Pacific Ocean (EPO) and its relationship with environmental variables using EFL data obtained from tuna purse-seining and Generalized Additive Models (GAMs). The model suggested that larger individuals of striped marlin were more likely to be found in waters with high Chlorophyll-a concentration (>2 mg/m 3 ) and with temperatures lower than 25°C, within a region known as the “cold tongue” and the Humboldt current system, while smaller individuals were more likely to be found in warmer and low productive areas within a region known as the “warm pool of the EPO.” We observed that set type caused a large variation on average EFL of striped marlin; larger fish were captured in sets associated with floating objects (natural and manmade), while smaller fish were captured in sets associated with dolphins. Despite this, our findings suggest that striped marlin has a latitudinal gradient in average EFL; larger individuals occurred predominantly south of 10°N, while smaller ones occurred predominantly in coastal waters between 10°N and 20°N, thus demonstrating a spatial segregation of the species affected by its maturity stage.
KW - generalized additive models
KW - satellite imagery
KW - tuna purse-seine fishery
UR - http://www.scopus.com/inward/record.url?scp=85053465330&partnerID=8YFLogxK
U2 - 10.1111/fog.12402
DO - 10.1111/fog.12402
M3 - Artículo
SN - 1054-6006
VL - 28
SP - 203
EP - 211
JO - Fisheries Oceanography
JF - Fisheries Oceanography
IS - 2
ER -