Biophysical models for Japanese scallop, Mizuhopecten yessoensis, aquaculture site selection in Funka Bay, Hokkaido, Japan, using remotely sensed data and geographic information system |
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Authors: | I Nyoman Radiarta Sei-Ichi Saitoh |
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Institution: | (1) Laboratory of Marine Bioresource and Environment Sensing, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1, Minato-cho Hakodate, Hokkaido 041-8611, Japan |
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Abstract: | Scallop aquaculture has grown to become the most successful marine shellfish farming venture in Japan. To ensure long-term
sustainability of scallop production, suitable sites need to be selected. This study was conducted to identify the most suitable
sites for hanging culture of Japanese scallop (Mizuhopecten yessoensis) based on measured biophysical parameters and modeled using geographic information system (GIS) models. Four biophysical
parameters that influence Japanese scallop aquaculture in Funka Bay were selected: sea temperature, food availability (chlorophyll-a), suspended solid, and bathymetry. The SeaWiFS and MODIS images were used to extract most of these parameters. A series of
GIS models was developed to identify suitable sites for scallop culture using a multi-criteria evaluation (MCE) known as weighted
linear combination. Suitability scores were ranked on a scale from 1 (least suitable) to 8 (most suitable), and about 83%
of the total potential area with bottom depths less than 60 m had scores of 7 and 8. The final model outputs were compared
with field verification data and found to be consistent. Local sensitivity analysis was used to test the robustness of the
model output. Based on this analysis, the order of importance of the variables affecting the model was as follows: suspended
solid > chlorophyll-a > sea temperature. |
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Keywords: | |
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