マダコOctopus vulgaris を鎮静化する最適マグネシウム（Mg2+）濃度の検討

IR JASI Web Site

Bibliographic Information

Other Title
  • マダコ Octopus vulgaris オ チンセイカ スル サイテキ マグネシウム Mg 2 ノウド ノ ケントウ
  • Optimum Concentration of Magnesium (Mg2+) to Anesthetize Octopus Octopus vulgaris

Search this article

Abstract

Optimum magnesium (Mg2+) concentration to anesthetize octopus Octopus vulgaris was determined behaviorally. In acute exposure experiments, eight octopuses were individually exposed to Mg2+ at a series of concentration that ranged from 20 to 100 mM. Exposure to Mg2+ suppressed octopus motions. At 40 mM, arm muscles relaxed in all tested individuals (8/8) and body color faded in 5/8 individuals. Respiration activities were reduced following the increase in Mg2+ concentration and were stopped at 80 mM in 2/8 and at 100 mM in 4/8 individuals. In chronic exposure experiments, respiration rate and survival rate of five octopuses were studied during and after exposed to 30 mM Mg2+ for 24 h. Respiration activity was reduced after 2 h exposure while muscle motions remained constant throughout the 24 h. All tested individuals survived magnesium exposure and recovered from anesthesia after they were returned in fresh seawater. We conclude that the optimum magnesium concentration to anesthetize O. vulgaris while keeping constant its respiration activity is 30 mM.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top