Blar i Flødevigens rapportserie (1982-1992) på dokumenttype "Research report"
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Avoidance from petroleum hydrocarbons by the cod (Gadus morhua)
(Flødevigen rapportserie, Research report, 1982)In laboratory experiments cod was presented a choice situation between different concentrations of petroleum hydrocarbons, appearing as "water soluble fraction" and emulsified droplets derived from Fuel Oil No. 2. In ... -
A comparison of primary growth rings in otoliths from Sprattus sprattus from Norway and Sardinella spp. from Sri Lanka. In: Flødevigen rapportserie no 1, 1986
(Flødevigen rapportserie, Research report, 1986)The present paper describes the otolith structure and the ring deposition pattern in 0-group sprat (Sprattus sprattus). This is compared with that of Sardinella from tropical waters. Age was estimated by using the primary ... -
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
(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 ... -
Description of the spawning and the early life history of haddock (Melanogrammus aeglefinus L.) from the Norwegian Skagerrak coast. In: Flødevigen rapportserie no 1, 1987
(Flødevigen rapportserie, Research report, 1987)Matured haddock were caught in late January 1982 and 1983 and transferred to a spawning basin. Spawning took place within 90 days from late February to late May each year, with a maximum from the middle of March to the ... -
Effects of hydrocarbons on growth and 14^C-uptake by Thalassiosira psudonana (Bacillariophyceae). In: Flødevigen rapportserie no 2, 1990
(Flødevigen rapportserie, Research report, 1990)Exponentially growing cultures of Thalassiosira pseudonana were exposed to different concentrations of benzene, naphthalene and decane. The acute effects of algal growth were different for increasing concentrations of ... -
Estimates of the abundance of mesopelagic fish off southern Norway and west of the British Isles 1971-1976. In: Flødevigen rapportserie no 1, 1986
(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. ... -
Fecundity studies on sprat, Sprattus sprattus L., from a fjord on the Norwegian Skagerrak coast. In: Flødevigen rapportserie no 1, 1992
(Flødevigen rapportserie, Research report, 1992)Data were collected monthly from sprat caught with trawl in Frierfjord, during January-May in 1985 and 1986. Sprat used ranged from 7 to 15 cm and from 2.1 to 27.9 g. Ichthyoplankton was sampled to follow the spawning ... -
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
(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. ... -
Fiskeribiologiske undersøkelser i Langesundsområdet, 1974-1978
(Flødevigen rapportserie, Research report, 1983)From 1974 to 1978 R/V "G.M. Dannevig" was used for 7-8 cruises yearly in the Langesund area. Parameters sampled at 7 stations were: temperature, salinity and oxygen in standard depths, phytoplankton studies in the upper ... -
Food selection in cod (Gadus morhua): reactions to colour and smell. In: Flødevigen rapportserie no 1, 1990
(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 ... -
Gyting hos hyse (Melanogrammus aeglefinus) under experimentelle betingelser
(Flødevigen rapportserie, Research report, 1982)Maturing haddocks were caught in late January 1982 and transferred to a spawning basin at the State Biological Station Flødevigen, Arendal. The spawning took place from February 26th to May 27th, with a maximum in March ... -
Habitat selection and inter year class interactions of young cod (Gadus morhua) in aquaria. In: Flødevigen rapportserie no 1, 1987
(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
(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, ... -
Hydrografi i Oslofjorden og Langesundsområdet 1974-1978
(Flødevigen rapportserie, Research report, 1982) -
Large-scale rearing of cod fry on the natural food production in enclosed pond
(Flødevigen rapportserie, Research report, 1983-06) -
Mass occurrence of Gyrodinium aureolum Hulburt and fish mortality along the southern coast of Norway in September-October 1981
(Flødevigen rapportserie, Research report, 1982)At the end of September 1981 the sea appeared "coffee brown" along the southern coast of Norway due to mass occurrence of Gyrodinium aureolum Hulburt. The maximum cell concentration observed was 70*10^6 cells*1^-1. When ... -
Prediction of year-class strength of coastal cod (Gadus morhua) from beach seine catches of 0-group. In: Flødevigen rapportserie no 1, 1992
(Flødevigen rapportserie, Research report, 1992)The validity of a beach seine 0-group index as a measure of year-class strength of cod in exposed areas along the Norwegian Skagerrak coast was tested. Fishing with trammel-nets was performed during November and December ... -
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
(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
(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 ... -
A stock assessment of lobster (Homarus gamarus) on the Norwegian Skagerrak coast
(Flødevigen rapportserie, Research report, 1982)The lobster stock on the Norwegian Skagerrak coast has become gradually less abundant since early 1950'ies. This is shown by decreasing catch per unit of effort and decreasing numbers according to cohort analysis on ...