A5032584121- Parasite Biology and Host Interactions
- Marine and fisheries research
- Aquaculture disease management and microbiota
- Identification and Quantification in Food
- Bird parasitology and diseases
- European and International Law Studies
- Fish Ecology and Management Studies
- Environmental Impact and Sustainability
- Aquaculture Nutrition and Growth
- Education, Healthcare and Sociology Research
- Agricultural Economics and Policy
- Fish Biology and Ecology Studies
- Yersinia bacterium, plague, ectoparasites research
- Social and Educational Sciences
- Soil and Water Nutrient Dynamics
- Pharmaceutical and Antibiotic Environmental Impacts
- Reproductive biology and impacts on aquatic species
- Environmental Toxicology and Ecotoxicology
- Environmental DNA in Biodiversity Studies
- Marine animal studies overview
- Antimicrobial Peptides and Activities
- Animal Behavior and Welfare Studies
- International Environmental Law and Policies
- Animal Behavior and Reproduction
- Insect and Pesticide Research
Norwegian Institute of Marine Research
1997-2014
Austevoll Seafood (Norway)
2004
Abstract Norwegian aquaculture has grown from its pioneering days in the 1970s to be a major industry. It is primarily based on culturing Atlantic salmon and rainbow trout potential influence surrounding environment wild populations. To evaluate these hazards, Institute of Marine Research initiated risk assessment farming 2011. This been repeated annually since. Here, we describe background, methods limitations for following hazards: genetic introgression farmed populations, regulatory...
The abundance of salmon lice in the Hardangerfjord is potentially large enough to be a threat wild fish stocks fjord. louse spends period 2–4 weeks its planktonic stages drifting current upper water masses fjord looking for suitable hosts on which settle. It important assess and distribution their phases order evaluate infection pressure they represent fish. system highly variable consists multitude components. This implicates similar variability dispersion. We find most efficient transport...
The vertical distribution of pelagic nauplii and copepodids the salmon louse Lepeophtheirus salmonis Krøyer was studied in large enclosures sea. Copepodids, which infect salmonid hosts, displayed a distinct diel migration pattern. They gathered near surface during day, spread out into deeper layers at night. Nauplii showed only small differences depth between night day. Copepodid seems to be controlled by light intensity; no effect either salinity or temperature found. This pattern, is...
To verify if and to what extent egg nauplii development of the salmon lice take place during winter, from copepodid stage at 2,3,4,5 10°C was examined. Newly extruded strings a winter population were individually placed in 6 ml stagnant hatching systems. Initially, no significant differences time found between these larger aerated systems, though tendency for less synchronised total string detected systems (difference< 12 h). In light versus dark conditions significantly prolonged by...
Artificial photoperiods that postpone sexual maturation and increase growth are now widely used in the Atlantic salmon Salmo salar L. farming industry. Few studies have been carried out to examine effect of this treatment on fish behaviour welfare production cages. In study, echo-integration was observe swimming depth density 20-m-deep cages illuminated by lamps mounted above water surface (SURF) or submerged cage (SUBS). From January May, SUBS swam at a greater (5–11 m) than SURF (1–3...
ABSTRACT The salmon louse, Lepeophtheirus salmonis, is an ectoparasitic copepod of salmonid fishes whose life cycle involves two broadly defined, free-living larval stages, the nauplius and copepodid. After settling on a host, copepodid goes through various transformations to become mobile adult. We recorded swimming responses free-swimming lice at naupliar, adult stages onset (ON) offset (OFF) lights varying spectral irradiance polarization. Nauplii showed prominent swim-up OFF response...
Surveys in the area around Austevoll Aquaculture Research station have failed to reveal presence of a large number free-swimming stages salmon lice water column. However, were abundant on held cages this area. Lice-free used as collectors at three sites chosen varying distances from other known sources (salmonid fish farms). The abundance particular was found vary during year and also between years. During study period, variations correlated with temperature, increased occurring higher...
Abstract The salmon louse, Lepeophtheirus salmonis , is an ectoparasitic copepod that infests both wild and farmed salmonid fish. Salmon lice are a major disease problem in the farming of Atlantic salmon, Salmo salar L., possibility playing role decline anadromous stocks has also been raised. can detect range stimuli (pressure/moving water, chemicals light) external environment. However, response thresholds to various stimuli, spatial temporal scales over which they operate context host...
Motile salmon lice Lepeophtheirus salmonis were successfully removed by an oil-based pyrethrum treatment mixture. The experiments described here are all based on skin exposure of the Salmo salar L. in-cage method, in which would delouse themselves jumping through a layer mixture, gave up to 86.9% delousing effect under low levels solar radiation (October). However, at higher (May), comparable decreased 31.8%. Studies time vs. showed no difference between 2-s and 10-s overall 89.5%....