東京湾における加入完了後のシャコの成長および寿命について
スポンサーリンク
概要
- 論文の詳細を見る
Mean body lengths of age groups by sex of the Japanese mantis shrimp Oratosquilla oratoria in Tokyo Bay were determined by 2, 423 females and 2, 293 males using size-frequency analysis method. A growth curve was fitted to length at age data and the life span was examined. It was found that the recruitment period started in November with a body length around 5cm and com-pleted in June of the following year. The mode of age O group during the recruitment period was not used in further interpretations, because the continuous addition of newly recruited individuals was found to lower its value. After recruitment completion, it was found that the growth of the mantis shrimp has seasonal oscillation with the highest growth rate from late summer to late autumn. Females showed higher growth oscillation than males. Growth of the mantis shrimp was best expressed by the Pauly and Gaschütz equation as Lt=16.12{1-exp[-0.395(t+2.667)-(0.486/2π)sin 2π(t-0.323)]} for females and Lt=21.51{1-exp[-0.264(1+2.473)-(0.232/2π)sin 2π(t-0.281)]}for males, where Lt is body length in cm and t is age in months. It seems that most of the mantis shrimp in Tokyo Bay died during age 2.
著者
関連論文
- 平成14年度(第15回)水文・水環境研究部会 シンポジウム報告
- 生育段階および品種を考慮した衛星リモートセンシングによる水稲単位収量推定に関する研究
- 小湊のイボニシとレイシガイにおけるimposex(雄性形質誘導及び生殖不全症候群)に関する研究(予報)
- 農林地からの流出水の硝酸態窒素濃度と土地利用との関係
- 衛星画像デ-タによる流域の水質環境解析-1-
- 水田窒素除去機能の定量化への試み
- 流量が湛水流下過程の硝酸性窒素除去機能に及ぼす影響--湛水土壌系の硝酸性窒素除去試験と解析(2)
- 湛水流下過程における硝酸性窒素濃度の低下--湛水土壌系の硝酸性窒素除去試験と解析(1)
- 養豚地域における降雨増水時の流出窒素負荷量の変動
- 休耕田を活用した長期窒素除去試験