Trypsin content in intestines of herring larvae,Clupea harengus,ingesting inert polystyrene spheres or live crustacea prey |
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| Authors: | K. Hjelmeland B. H. Pedersen E. M. Nilssen |
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| Affiliation: | (1) Foundation for Applied Research, University of Tromsø, Guleng, P.O. Box 3063, N-9001 Tromsø, Norway;(2) Danish Institute of Fisheries and Marine Research, Charlottenlund Castle, DK-2920 Charlottenlund, Denmark;(3) Institute of Biology and Geology, University of Tromsø, N-9000 Tromsø, Norway |
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| Abstract: | In 1986, at the Danish Institute of Fisheries and Marine Research, Denmark, Clupea harengus L. larvae from three different herring stocks were offered either non-biodegradable polystyrene spheres, nauplii and copepodites of Acartia tonsa or Artemia ssp. nauplii. Ingestion of polystyrene spheres induced trypsin secretion to a higher level than in non-feeding fish. Larvae ingesting live food of the same width as the polystyrene spheres exhibited the highest trypsin content in the intestines. Mechanisms responsible for the regulation of pancreatic enzyme secretion are discussed. |
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