Publications by authors named "Ida Heden"

The Atlantic wolffish (Anarhichas lupus) is a cold-water species with the potential to diversify aquaculture in Northern countries. Few studies have investigated the stress physiology of Atlantic wolffish, and the current knowledge on stress in wolffish species is largely derived from the closely related spotted wolffish (Anarhichas minor). In the current study, Atlantic wolffish were exposed to handling stress mimicking common husbandry conditions in aquaculture such as repeated air exposure and net-chasing.

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The Atlantic wolffish (Anarhichas lupus) is a cold-water fish with potential for aquaculture diversification. To unveil the mechanisms underlying the compromised growth in Atlantic wolffish when reared at higher temperatures, we investigated the relationship between temperature, growth rate, aerobic capacity, stress biomarkers, and gut barrier function. Juveniles acclimated to 10°C were maintained at 10°C (control) or exposed to 15°C for either 24 h (acute exposure) or 50 days (chronic exposure).

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Haemoglobin concentration ([Hb]) assessment in fish blood has become a routine parameter to measure the health and welfare status of the animals. The original method (haemoglobincyanide method, best known as the Drabkin method) for measuring Hb in human and animals is not well suited for work outside of a laboratory setting. It is relatively time consuming, contains hazardous cyanide elements, and requires specific laboratory material.

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Article Synopsis
  • The study aimed to determine the optimal dietary protein requirement for juvenile Atlantic wolffish in aquaculture, testing diets with crude protein levels from 35% to 60%.
  • The highest protein diet (60%) led to the best growth rates, with significant weight gain and specific growth rates observed, while the lower protein diets provided lesser growth.
  • Despite increased hepatic lipid deposition in fish consuming high-protein diets, overall welfare indicators like plasma cortisol and glucose levels showed no diet-related effects, suggesting that a minimum protein level of 50% is essential for growth.
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Na/K-ATPases (NKA) in the basolateral membrane of the intestinal enterocytes create a Na-gradient that drives both ion-coupled fluid uptake and nutrient transport. Being dependent on the same gradient as well as on the environmental salinity, these processes have the potential to affect each other. In salmonids, L-lysine absorption has been shown to be higher in freshwater (FW) than in seawater (SW) acclimated fish.

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Ghrelin is involved in the regulation of growth in vertebrates through controlling different functions, such as feed intake, metabolism, intestinal activity or growth hormone (Gh) secretion. The aim of this work was to identify the sequences of and Ghrelin receptors (), and to study their responses to different nutritional conditions in gilthead sea bream () juveniles. The structure and phylogeny of was analyzed, and a tissue screening was performed.

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