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Quarterly Journal of Microscopical Science, Vol s3-96, 173-176, Copyright © 1955 by Company of Biologists

Haemoglobin in the Fat-Cells of Daphnia

J. GREEN 1

1 The Zoology Department, Bedford College (University of London), Regent's Park, London, N.W. 1

When placed in well aerated water, Daphnia can lose haemoglobin from its blood by two methods. The haemoglobin may be passed into the eggs or it may be broken down in the fat-cells. When populations of D. curvirostris or D. pulex, with much haemoglobin in the blood, are placed in conditions in which they can produce very few eggs and are then placed in well aerated water, haemoglobin appears as globules in the fat-cells. This appears to be an emergency measure to remove haemoglobin from the blood until the fat-cells can break it down. When equally red animals, producing ten eggs each, are placed in well aerated water, globules of haemoglobin do not appear in the fat-cells. Sufficient haemoglobin is drained from the blood into the eggs to render the formation of haemoglobin globules in the fat-cells unnecessary.






© The Company of Biologists Ltd 1955