About TANAKA HIROSHIGE
About 水産研究・教育機構北海道区水産研究所
About 日本水産学会誌
About fishing net
About ecosystem
About environmental impact assessment
About habitat environment
About aquatic resource
About CPUE
About trawl net
About marine ecosystem
About environmental impact assessment
About fisheries resource
About Fisheries biology in general
About Fishing gears,fishing tackles
About Ecosystems
About 生態系
About 影響評価