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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50082

Title: Association between the interannual variation in the oceanic environment and catch rates of bigeye tuna (Thunnus obesus) in the Atlantic Ocean
Authors: Kuo‐Wei Lan
Ming‐An Lee
Chin‐Pei Chou
Ali Haghi Vayghan
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: annual
assemblage
Atlantic
behavior
biological dynamics
biology
catch per unit effort
climate
fish
fishery
habitat
indices
level of organization
longline
method
migration
NAO
oceanography
pelagic
population
region
remote sensing
taxon
temperature
thermocline
time scale
tropical
tuna
Date: 2018-06
Issue Date: 2018-09-14T06:59:39Z
Publisher: Fisheries oceanography
Abstract: Abstract: The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic Ocean. The present findings reveal that the year (temporal factor), latitude and longitude (spatial factors), and major regular longline target species of albacore catches are significant for the standardization of bigeye tuna catch rates in the Atlantic Ocean. The standardized catch rates and distribution of bigeye tuna were found to be related to environmental and climatic variation. The model selection processes showed that the selected GAMs explained 70% of the cumulative deviance in the entire Atlantic Ocean. Regarding environmental factors, the depth of the 20 degree isotherm (D20) substantially contributed to the explained deviance; other important factors were sea surface temperature (SST) and sea surface height deviation (SSHD). The potential fishing grounds were observed with SSTs of 22–28°C, a D20 shallower than 150 m and negative SSHDs in the Atlantic Ocean. The higher predicted catch rates were increased in the positive northern tropical Atlantic and negative North Atlantic Oscillation events with a higher SST and shallow D20, suggesting that climatic oscillations affect the population abundance and distribution of bigeye tuna.
Relation: 27(5) pp.395-407
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50082
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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