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Journal of Experimental Biology 111,31-42 (1984)
Published by Company of Biologists 1984

Nematocyst Inactivation During Feeding in Hydra Littoralis

R. J. RUCH 1 and C. B. COOK 2

1 Department of Zoology, The Ohio State University, Columbus, OH 43210, U.S.A.; Department of Pathology, Medical College of Ohio, CS 10008, Toledo, OH 43699, U.S.A.
2 Department of Zoology, The Ohio State University, Columbus, OH 43210, U.S.A.; Bermuda Biological Station for Research, Ferry Reach 1-15, Bermuda

Hydra littoralis uses stenotele nematocysts for prey-killing. Unused stenoteles are retained when prey-killing ceases. This inactivation results from an accumulation of soluble factors in the surrounding medium, and ends when hydra are placed in fresh culture solution. The inactivation factors are most probably released from the hydra during nematocyst discharge since stenotele activity is reduced by KCl solutions containing nematocyst factors and is enhanced by prey homogenate.

Key words: Hydra, nematocysts, feeding, coelenteratea

Accepted on February 27, 1984






© The Company of Biologists Ltd 1984