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Protozoans—the first food of larval herring (Clupea harengus L.)?

✍ Scribed by P. Spittler; U. Brenning; G. Arlt

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
425 KB
Volume
75
Category
Article
ISSN
1434-2944

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✦ Synopsis

I n short-run experiments herring larvae at the end of the yolk sac stage (SL 6.5 t o 8.5 m) were fed with maize and potato starch to investigate the effect of particle size on food selection. About 20% of the larvae ingested these particles during the experiments.

I n the case of maize starch (3 to 26 pm grain size) the size classes from 14 t o 25 pm and in the case of potato starch (5 to 80 pm) the size classes larger than 29 pm were preferred. The highest numbers of ingested grains per larva were 150 maize starch grains and 57 potato starch grains.

The selective uptake of these size classes leads to the conclusion that planktonic organisms in this size range-in other words mostly protozoans-may play an important role as a first food source of herring larvae.

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