Satiation of juveniles ofCoregonus lavaretus L. fed onDaphnia pulicaria |
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| Authors: | Roland Rösch |
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| Institution: | (1) Present address: Institut für Seenforschung und Fischereiwesen, Untere Seestrasse 81, D-7994 Langenargen, Federal Republic of Germany |
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| Abstract: | Juveniles ofCoregonus lavaretus L. of a body weight (wet weight) between 0.5 and 11g were fed on pond reared livingDaphnia pulicaria. The fish were held in groups of 4 to 8 fish in tanks of a volume of 10 to 20 l at water temperatures of 8, 12, 16 and 20°C.
After a deprivation time of 24 h the fish were fed an amount of livingDaphnia of about 1000 specimen/l. Fish of a body weight (wet weight) less than 1 g showed a continuous food intake until satiation,
whereas the food intake of bigger fish was divided into three phases: During a first feeding period 50 to 73% of the satiation
amount were consumed. This feeding period was followed by a period of no food intake, which was followed by a second feeding
period. At the end of the second feeding period the fish were satiated. The period of no food intake is considered to be a
specific adaptation to planctivory.
The satiation time (min) increased with increasing body weight and increasing water temperature.
The satiation amount, i.e. the amount of food eaten until satiation (mg stomach content, dry weight) increased with increasing
body weight.
The satiation amount expressed in % body weight (dry weight/dry weight) reached a maximum of 10% for fish of a body weight
of 1 g. With increasing body weight it decreased to 5% for fish of 11 g b.wt. At 8°C the satiation amount was significantly
lower than at 12°C.
The experiments were performed at the Limnological Institute, University of Constance, D-7750 Constance, Federal Republic
of Germany. |
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