Blar i Fiskeridirektoratets skrifter, Serie Havundersøkelser (1900-1990) på forfatter "Fossum, Petter"
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Digestion rate of food particles in the gut of larval herring (Clupea harengus L)
Fossum, Petter (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1983)Laboratory experiments with herring larvae (Clupea harengus L.) from the local stock in Lindåspollene, north of Bergen, Norway, were performed in the spring of 1978 and 1979. Digestion rates of copepod nauplii and polychaet ... -
The duration of the first two yolk sac stages in herring (Clupea Harengus L.) larvae
Fossum, Petter (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)Artifically fertilized and naturally spawned herring eggs from the local herring stock in Lindåspollene, north of Bergen, Norway, were hatched at 9°C in 1978 and at 6°C in 1979. The purpose was to calculate the duration ... -
A staging system for larval cod (Gadus morhua L.)
Fossum, Petter (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)A staging system of larval cod is described. The system is based on the resorption of the yolk mass and the cell layers surrounding it combined with eye, mouth and gut development. A determination key is given. Each stage ... -
A tentative method to estimate mortality in the egg and early fish larval stages, with special reference to cod (Gadus morhua L.)
Fossum, Petter (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1988)A tentative method to estimate egg and larval mortality is demonstrated. The material was sampled during the cod egg and larvae surveys in the Lofoten area in the years 1983 and 1984. Correct ageing of eggs and larvae, ...