Browsing Flødevigens rapportserie (1982-1992) by Title
Now showing items 7-26 of 67
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Cod (Gadus morhua L.) off Møre - Composition and migration. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Important spawning- as well as nursery- and feeding areas for cod, Gadus morhua L. are found off the Møre coast. In this paper age compositions, age at first spawninq, otolith patterns and migration of cod in the Møre ... -
Cod fish otoliths: information storage structures. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The otoliths of cod fish may have incorporated within their structural and chemical components a large amount of lifehistory information. This information may be revealed when appropriate analytical methods are utilized. ... -
Cod larvae sampling with a large pump off SW-Island. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)In an attempt to collect adequate samples of cod and other larvae in the spawning areas off SW-Iceland, experiments using a large fish pump for this purpose were carried out from 1981 to 1983. The pump used was an 8" ... -
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 ... -
Criteria for condition evolved from enclosure experiments with cod larva populations. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)A number of experiments have been carried out with cod larvae in mesocosms at variable feeding conditions. Larval growth and survival has been monitored beyond metamorphosis, and in some of the experiments large ... -
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 ... -
Development and mortality of cod (Gadus morhua L.) eggs and larvae in different temperatures. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)This experiment was carried out as a part of a project concerning thermal pollution from a power plant. The paper deals with development and mortality of cod eggs and larvae in different temperatures (6O-18 degrees C). ... -
Disease problems in cod rearing. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Disease seems to be an inevitable part of fish rearing systems, and the first disease problems in the Austevoll cod rearing experiments are reported. Work on prophylactic treatment against vibriosis through vaccination ... -
Distribution of eggs and larvae of gadoid fishes from Stad to Lofoten during April 1976-1982. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Fish eggs and larvae have been sampled during the study of herring larvae distribution. Since 1976 these findings have been recorded. Most of the gadoid eggs are difficult to identify, but identification of larvae and ... -
The distribution of young cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The distribution of young cod in the North Sea is described, using catch data from national and international trawl surveys and experimental fishing. Information on seasonal movements and feeding related to the concentration ... -
Does cod farming have a commercial future? A technical and economic assessment. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Cod is a traditional favourite with British consumers, but supplies have fallen dramatically through the 1960's and 70's as a result of imposed fishing limitations. Maintenance of supplies for the future will depend on ... -
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 consumption rate and gut evacuation processes of first feeding cod larvae In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Laboratory experiments with cod larvae (Gadus morhua L.) during optimum feeding conditions showed that cod larvae were sporadic feeders rather than continuous feeders. Digestion rate of copepod nauplii was less than 30 ... -
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 ... -
The future of cod farming and the possibility of restocking local coastal cod populations. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)