A5045725012- Aquaculture disease management and microbiota
- Physiological and biochemical adaptations
- Animal Behavior and Reproduction
- Aquaculture Nutrition and Growth
- Neuroendocrine regulation and behavior
- Fish Ecology and Management Studies
- Parasite Biology and Host Interactions
- Primate Behavior and Ecology
- Zebrafish Biomedical Research Applications
- Stress Responses and Cortisol
- Amphibian and Reptile Biology
- Reproductive biology and impacts on aquatic species
- Bird parasitology and diseases
- Neurogenesis and neuroplasticity mechanisms
- Regulation of Appetite and Obesity
- Animal Nutrition and Physiology
- Animal Behavior and Welfare Studies
- Fish Biology and Ecology Studies
- Meat and Animal Product Quality
- Neuroinflammation and Neurodegeneration Mechanisms
- Neurobiology and Insect Physiology Research
- Genetic and phenotypic traits in livestock
- Ocean Acidification Effects and Responses
- Mosquito-borne diseases and control
- Birth, Development, and Health
Akershus University Hospital
2025
Norwegian University of Life Sciences
2013-2024
University of Oslo
2004-2015
University of South Dakota
2004-2007
Uppsala University
1999-2002
We report changes in brain serotonergic, noradrenergic and dopaminergic activity, along with plasma cortisol concentrations, occurring during the initial 24-h period following establishment of dominant-subordinate relationships pairs rainbow trout. Immediately (within 5 min) after termination staged fights for social dominance, a large increase blood was observed both fight losers (future subordinate fish) winners dominant fish). In fish, decreased rapidly 3 h) to level unstressed controls,...
In rainbow trout the magnitude of cortisol response to stress shows both consistency over time and a moderate high degree heritability, responding (HR) low (LR) lines have been generated by individual selection for consistently or post-stress values. Using 2nd 3rd generation fish, we tested hypothesis that differential responsiveness is associated with behavioral alterations in HR-LR model. LR fish showed tendency become socially dominant, rapid recovery food intake after transfer novel...
Abstract Individual differences in physiological and behavioural responses to stressors are increasingly recognised as adaptive variation thus raw material for evolution fish farming improvements including selective breeding. Such individual has been evolutionarily conserved is present all vertebrate taxa fish. In farmed animals, the interest consistent trait associations, that coping styles, increased dramatically over last years because many studies have demonstrated links performance...
SUMMARY Two F1 lines of rainbow trout Oncorhynchus mykiss, divergent for plasma cortisol responsiveness, were generated by individual selection post-stress values within the F0 generation. Adult females generation transferred to rearing in social isolation observation tanks. After 6 days, locomotor activity high-responding (HR) and low-responding (LR) individuals was quantified as time spent moving during a 20 min period. Behavioural observations repeated next day with smaller conspecific...
SUMMARY Juvenile rainbow trout Oncorhynchus mykiss were isolated in individual compartments observation aquaria and allowed to acclimate for 1 week, during which they fed commercial feed. Thereafter, the fish tested aggressive behaviour using a resident/intruder test. Following this first test, feed was exchanged an experimental wet supplemented with 0.15 % or 1.5 l-tryptophan (by mass). Controls received same but without supplementation. The satiety daily, their intake recorded. Aggressive...
Abstract A semantic model for overall welfare assessment of Atlantic salmon reared in sea cages is presented. The model, called SWIM 1.0, designed to enable fish farmers make a formal and standardized using set selected indicators. In order cover all relevant aspects from the animals’ point view create science‐based tool we first identified known needs searched literature feasible framework modelling was used perform structured review an evaluation each indicator. indicators were water...
Despite the use of fish models to study human mental disorders and dysfunctions, knowledge regional telencephalic responses in non-mammalian vertebrates expressing alternate stress coping styles is poor. Since perception salient stimuli associated with mammals mainly under forebrain limbic control, we tested region-specific neural (i.e. mRNA abundance monoamine neurochemistry) endocrine at basal acute conditions for previously characterised proactive reactive Atlantic salmon. Reactive show a...
We investigated the relationship between social interactions, brain serotonergic activity, and two behavioural patterns in juvenile Arctic char (Salvelinus alpinus): feeding spontaneous swimming activity. Dominant subordinate individuals were observed during rearing pairs, followed by isolation. Throughout experiment, levels of both food intake activity remained high dominant fish. When they was completely inhibited fish; thus, fish able to monopolise food. At same time, as indexed ratio...
Multilocus F ST estimates revealed a pronounced genetic structure at six microsatellite loci in brown trout Salmo trutta Nordre Finnvikelv, with least three breeding units that remained stable over time. Significant differences allele frequencies were found between five sections within 3‐km range, even when no physical barriers prevented fish from migrating sections. It is argued geological structures may rise to patterns resembling isolation by distance. Seemingly, the most important factor...
Serotonin is widely believed to exert inhibitory control over aggressive behavior and intent. In addition, a number of studies fish, reptiles, mammals, including the lizard Anolis carolinensis, have demonstrated that serotonergic activity stimulated by social interaction in both dominant subordinate males. As does not appear inhibit agonistic during combative interaction, we investigated possibility negative correlation between aggression exists before begins. To do this, putatively more...