Blar i Flødevigens rapportserie (1982-1992) på forfatter "Gjøsæter, Jakob"
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Competition for food and predator-prey relationships among young cod (Gadus Morhua) and some other fish from shallow waters. In: Flødevigen rapportserie no 1, 1988
Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1988)Experiments were conducted to study food competition between young cod (20-30 cm) and some other fish from shallow waters. When food was dropped from the surlace the cod took much more than the other species, but ... -
Estimates of the abundance of mesopelagic fish off southern Norway and west of the British Isles 1971-1976. In: Flødevigen rapportserie no 1, 1986
Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1986)Mesopelagic fish were studied using 38 and 50 kHz echo sounders and electronic integrators on cruises covering the Norwegian Deep, Skagerrak, the slope north of the North Sea and west of the British Isles during 1971-1976. ... -
Feeding behaviour of Diaphus dumerilii in NW Africa with notes on its relations to other myctophids in the area. In: Flødevigen rapportserie no 1, 1988
Alwis, Ajanta de; Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1988)The feeding pattern of D. dumerilii was studied based on material collected by R/V "Dr. Fridtjof Nansen" from west Africa (from Mauritania to Nigeria-Congo area and the Cape Verde Islands) in 1981. The other species. ... -
Food selection in cod (Gadus morhua): reactions to colour and smell. In: Flødevigen rapportserie no 1, 1990
Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1990)Cod were offered food and food imitations with various colours and smells. When offered crabs with natural colour and with the carapace painted in red, yellow or green, they showed no significant preference. Neither did ... -
Habitat selection and inter year class interactions of young cod (Gadus morhua) in aquaria. In: Flødevigen rapportserie no 1, 1987
Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1987)Groups of five small (12 - 18 cm) cod were kept in aquaria with two compartments, one with sand and one with stones and algae. When alone, the small fish usually spent most of the time in the compartment with stones and ... -
Habitat selection of juvenile cod (Gadus morhua), whiting (Merlangus merlangius) and some littoral fish in an aquarium. In: Flødevigen rapportserie no 1, 1987
Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1987)Experiments were conducted to study the habit at selection of juvenile cod Gadus morhua, juvenile whiting merlangus merlangius, black goby Gobius niger, great pipefish Syngnathus acus, sand eel Ammodytes tobianus, ... -
Recruitment of cod (Gadus morhua), whiting (Merlangius merlangus) and pollack (Pollachius pollachius) in the Risør area on the Norwegian Skagerrak coast 1945 to 1985. In: Flødevigen rapportserie no 1, 1990
Gjøsæter, Jakob; Danielssen, Didrik S. (Flødevigen rapportserie, Research report, 1990)0-group gadoids and other fishes from the shallow water zone were sampled with a beach seine at 22 fixed localities in the Risør area at the Norwegian Skagerrak coast. A series of 41 years (1945 - 85) has been analysed. Cod, ... -
Some aspects of the feeding ecology of myctophids in the waters off central east Africa. In: Flødevigen rapportserie no 1, 1988
Alwis, Ajanta de; Gjøsæter, Jakob (Flødevigen rapportserie, Research report, 1988)Analyses of the degree of filling and the state of digestion of four species (Diaphus watasei, Benthosema fibulatum, Myctophum brachygnatum and Diaphus garmani) revealed that all but D. watasei were cyclic feeders feeding ...