Bulletin of the United States Bureau of Fisheries, Vol. 38: 1921-1922 (Classic Reprint) - Hardcover

Henry O'malley

9780428554569: Bulletin of the United States Bureau of Fisheries, Vol. 38: 1921-1922 (Classic Reprint)

Hardcover

ISBN 10: 0428554563 ISBN 13: 9780428554569

Publisher: Forgotten Books, 2018

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Excerpt from Bulletin of the United States Bureau of Fisheries, Vol. 38: 1921-1922

There are few animals that lend themselves more readily to a laboratory or lecture demonstration than do these stem - dwelling larva. They seem to differ decidedly from other chironomids, especially those that characteristically live in a mud burrow, in their reactions to strong light. Their greater tolerance of light enables one to demon strate the Silk-spinning movements and the general behavior of the larva by means of a stereopticon. The only requirements are that the larva shall have recently built a fresh, clean Silk tube in a glass preparation, and that the temperature of the water be kept down to normal room temperature. The reason for requiring that the silken tube be a fresh one is that after a week or two the silk becomes much discolored by the lodgment of fine particles as well as by the deliberate attachment of masses of castings to the ends of the burrow. It is only necessary to remove the larva by a jet Of water and then the tube can be removed by a needle. A few hours will usually suffice to enable them to again replace the silken tube. The temperature is easily controlled by having a Specially constructed lantern slide through which a current of water can be made to pass. A type used with considerable success was constructed as follows.

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