Summary
The stunted growth of the Dutch perch was studied. To calculate the age and former growth the winterrings of the scales were used. The excellent growth of perch in some parts of Holland in contrast to the bad growth reported by foreign authors is discussed. It is pointed out that the latter growth may be ascribed to the existence of false winterrings, from which one can get rid by dipping the scales in a HCl-solution.
It appeared that the initial growth of the stunted perch up to about 13 cm is good. The stunted growth afterwards must be ascribed to a shortage of prey-fish. Especially the smelt seems to be very important. As, however, in Holland young roach are abundant it seems incomprehensible why these cannot serve for suitable perch-food. To investigate this problem the conduct of hunting perch was studied in an aquarium.
The results of the aquarium-experiments were in agreement with the change in food-diet at a certain length discussed by other authors; also with the assumption that middle-sized perch do not prey upon smaller congeners.
Concerning the preying upon roach it became clear that a single perch will scarcely or not succeed in seizing a roach. The hunting is accomplished by cooperation in open water stretches. Amidst plants perch does not hunt. Hence the stunted growth of perch in Holland must be ascribed to the many plants in Dutch waters, between which the roach may easily escape hunting by perch.
A short comparison of prey-sizing by wels, pike pike-perch and perch is made.
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Deelder, C.L. A contribution to the knowledge of the stunted growth of perch (Perca fluviatilis L.) in Holland. Hydrobiologia 3, 357–378 (1951). https://doi.org/10.1007/BF00045560
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DOI: https://doi.org/10.1007/BF00045560