ワカメの害敵としてのアメフラシの生態に関する研究-I : 食性

スポンサーリンク

概要

• 論文の詳細を見る

• Sea-urchins, abalones and sea-hares etc. are generally known as predator of the brown seaweed, Undaria pinnatifida, which is much esteemed as an article of food in Japan. Recently, the decrease of the yield of Undaria caused by the sea-hare has been reported from the coast of Kumamoto, Mie and Aichi Prefecture. The studies had been made on the biology of the sea-hares, in connection with the damage of Undaria occured at the coast of Toyohama, Aichi Pref., in 1958-60. This paper deals with a study on the feeding habit of the sea-hares and the results obtained are summarized as follows: (1) Two species of the sea-hares, Aplysia juliana and A. kurodai are found on the coast of Toyohama, Aichi Pref., during the warm season especially from late April to June. This period falls on the spawning season of the animals and also at the same time on the harvesting time of the seaweed. (2) In the laboratory experiments, A. kurodai feeds on the green and red seaweeds, while A. juliana does on the brown and green ones, having especially a preference for Undaria pinnatifida. The latter usually feeds on the blade of Undaria, but the animal may attack also the stem of the seaweed when their soft parts were exhausted. (3) An animal of ca. 200 grams of A. juliana could consume ca. 11-12 grams of soft blade of Undaria in one day. This amount counts for a frond of young Undaria or onehalf or one-third of medial sized one. (4) The amount of feeding remarkably decreases when the water temperature goes out of the range of 15-24°C.

著者

• 中村 中六

  東京大学農学部付属水産実験所

• 斎藤 雄之助

  東京大学農学部附属水産実験所

関連論文

• ウナギの生殖腺の成熟に関する研究-I : 性分化および生殖腺の成熟過程
• ワカメの害敵としてのアメフラシの生態に関する研究-I : 食性
• ワカメの生態に関する研究-IV : 着生胞子,配偶体,芽胞体におよぼす露出の影響について
• トビゴイに関する研究-IV : 試驗魚群に加えられた少数のやや大きい個体群の影響および飼育密度の影響について
• 東海地方の養鰻池に於ける水色,透明度等の季節的変化と粒子組成より見た植物性プランクトン
• トビゴイに関する研究(第2報) : 餌料の粒子組成と量の影響
• トビゴイに関する研究-I : トビの現れる時期に就いて

スポンサーリンク