Detection of pelagic habitat hotspots for skipjack tuna in the Gulf of Bone-Flores Sea, southwestern Coral Triangle tuna, Indonesia

Using remote sensing of sea surface temperature (SST), sea surface height anomaly (SSHA) and chlorophyll-a (Chl-a) together with catch data, we investigated the detection and persistence of important pelagic habitat hotspots for skipjack tuna in the Gulf of Bone-Flores Sea, Indonesia. We analyzed th...

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Bibliographic Details
Published in:PloS one 2017-10, Vol.12 (10), p.e0185601-e0185601
Main Authors: Zainuddin, Mukti, Farhum, Aisjah, Safruddin, Safruddin, Selamat, Muhammad Banda, Sudirman, Sudirman, Nurdin, Nurjannah, Syamsuddin, Mega, Ridwan, Muhammad, Saitoh, Sei-Ichi
Format: Article
Language:English
Subjects:
Abundance
Animals
Biology and Life Sciences
Chlorophyll
Commercial fishing
Data processing
Demography
Earth Sciences
Ecology and Environmental Sciences
Ecosystem
Ecosystems
Environmental Monitoring
Fish
Fisheries
Fishing
Habitats
Height anomalies
Indonesia
Katsuwonus pelamis
Monsoons
Oceanographic data
Oceanography
Oceans
Physiological aspects
Prey
Remote sensing
Remote Sensing Technology
Satellites
Sea surface temperature
Skipjack tuna
Studies
Surface temperature
Tuna
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Summary:Using remote sensing of sea surface temperature (SST), sea surface height anomaly (SSHA) and chlorophyll-a (Chl-a) together with catch data, we investigated the detection and persistence of important pelagic habitat hotspots for skipjack tuna in the Gulf of Bone-Flores Sea, Indonesia. We analyzed the data for the period between the northwest and southeast monsoon 2007-2011. A pelagic hotspot index was constructed from a model of multi-spectrum satellite-based oceanographic data in relation to skipjack fishing performance. Results showed that skipjack catch per unit efforts (CPUEs) increased significantly in areas of highest pelagic hotspot indices. The distribution and dynamics of habitat hotspots were detected by the synoptic measurements of SST, SSHA and Chl-a ranging from 29.5° to 31.5°C, from 2.5 to 12.5 cm and from 0.15 to 0.35 mg m-3, respectively. Total area of hotspots consistently peaked in May. Validation of skipjack CPUE predicted by our model against observed data from 2012 was highly significant. The key pelagic habitat corresponded with the Chl-a front, which could be related to the areas of relatively high prey abundance (enhanced feeding opportunity) for skipjack. We found that the area and persistence of the potential skipjack habitat hotspots for the 5 years were clearly identified by the 0.2 mg m-3 Chl-a isopleth, suggesting that the Chl-a front provides a key oceanographic indicator for global understanding on skipjack tuna habitat hotspots in the western tropical Pacific Ocean, especially within Coral Triangle tuna.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0185601