Seasonal Variations of Oceanographic Variables and Eastern Little Tuna (Euthynnus affinis) Catches in the North Indramayu Waters Java Sea

3rd International Conference on Tropical and Coastal Region Eco Development 2017

地球科学;生态环境科学

Syamsuddin, Mega^1 ; Sunarto^1 ; Yuliadi, Lintang^1

Department of Marine Sciences, Faculty of Fishery and Marine Science Padjadjaran University, Jl. Raya Bandung-Sumedang KM. 21, Jatinangor

45363, Indonesia^1

关键词: Eastern little tunas;    Interannual variation;    Oceanographic conditions;    Oceanographic variables;    Remotely sensed data;    Sea surface temperature (SST);    Seasonal variation;    Wavelet spectrum analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/116/1/012073/pdf
DOI  :  10.1088/1755-1315/116/1/012073

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The remotely derived oceanographic variables included sea surface temperature (SST), chlorophyll-A (Chl-A) and Eastern Little Tuna (Euthynnus affinis) catches are used as a combined dataset to understand the seasonal variation of oceanographic variables and Eastern Little Tuna catches in the north Indramayu waters, Java Sea. The fish catches and remotely sensed data were analysed for the 5 years datasets from 2010-2014. This study has shown the effect of monsoon inducing oceanographic condition in the study area. Seasonal change features were dominant for all the selected oceanographic parameters of SST and Chl-A, and also Eastern Little Tuna catches, respectively. The Eastern Little Tuna catch rates have the peak season from September to December (700 to 1000) ton that corresponded with the value of SST ranging from 29 °C to 30 °C following the decreasing of Chl-A concentrations in September to November (0.4 to 0.5) mg m-3. The monsoonal system plays a great role in determining the variability of oceanographic conditions and catch in the north Indramayu waters, Java Sea. The catches seemed higher during the northwest monsoon than in the southeast monsoon for all year observations except in 2010. The wavelet spectrum analysis results confirmed that Eastern Little Tuna catches had seasonal and inter-Annual variations during 2012-2014. The SST had seasonal variations during 2010-2014. The Chl-A also showed seasonal variations during 2010-2011 and interannual variations during 2011-2014. Our results would benefit the fishermen and policy makers to have better management for sustainable catch in the study area.