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Journal of Experimental Biology 8,55-62 (1931)
Published by Company of Biologists 1931

The Growth of Fish : IV. The Effect of Food Supply on the Scales of Salmo Irrideus

J. GRAY F.R.S.¹ and S. B. SETNA PH.D.¹

¹ Zoological Laboratory, Cambridge

1. Salmo irrideus fed continuously throughout the year exhibit on their scales no seasonal periodicity in the distance apart of their concentric ridges or rings.

2. Similar fish fed with abundant food form on a proportion of their scales abnormally wide rings even during the winter months.

3. Fish fed with limited diet develop abnormally narrow rings.

4. The width of the rings is probably closely associated with growth rate.