Tómas Árnason

Tómas Árnason
Marine and Freshwater Research Institute | MRI · Aquaculture

MSc Aquaculture

About

14
Publications
2,555
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
301
Citations
Introduction
I work at the Marine and Freshwater Research Institute in Iceland. Currently the main focus of my research is on Arctic charr.
Additional affiliations
January 2008 - present
Education
September 2005 - November 2007
University of Akureyri
Field of study
  • Fisheries Science and Aquaculture

Publications

Publications (14)
Article
Full-text available
The effects of early thermal environment on growth, age at maturity, and sexual size dimorphism in Arctic charr (Salvelinus alpinus) are investigated. This study is a 654-day long rearing trial split into two sequential experimental phases termed EP1 and EP2 and lasting 315 and 339 days, respectively. EP1 started at the end of the yolk sac stage wh...
Article
Full-text available
Background Archival tags have been used on fish for a number of years to measure temperature, pressure and salinity, among other parameters. Measurements of heart rate in fish can be used in a wide variety of biological and ecological studies, e.g., for evaluating short- and long-term effects of stressful conditions involved with fishing and farmin...
Article
The effects of temperature and growth hormone (GH) implantation on growth of juvenile Atlantic wolffish (Anarhichas lupus) were investigated. The year-long study had three sequential experimental phases (EP) termed EP1, EP2 and EP3, lasting for 6, 9 and 37 weeks, respectively. The experimental fish were divided into four groups and reared at differ...
Chapter
This chapter provides general insight into the lumpfish farming industry in Iceland.
Article
The effects of a 6 week short-day photoperiod followed by continuous light, applied during the juvenile phase of Arctic charr Salvelinus alpinus in fresh water on smoltification and on the long-term growth and maturity following transfer to brackish water (BW) (constant salinity of either 17 and 27 or increasing salinity in steps from 17 to 27) wer...
Article
Arctic charr Salvelinus alpinus of the Hólar strain (mean ± s.e. body mass = 152·1 ± 3·1 g) were reared at four different salinity regimes at a constant temperature of 7·4° C. Two groups were given a three-month acclimation in salinity 18 before the salinity was increased to either 25 or 29 (groups called A25 and A29), and two groups were reared in...
Article
The effects of salinity and temperature on growth, plasma ions, cortisol and immune parameters were inves-tigated in two experiments. In the first experiment small, medium and large juvenile Atlantic cod Gadus morhua (initial average weights of 1.9, 8 and 83 g, respectively) were reared at four constant salinities (6 to 32‰) for a short period (19–...
Article
Full-text available
Á hverju sumri eru haldin sjóstangaveiðimót á vegum Landsambands Sjóstangaveiðifélaga sem telja til Íslandsmeistaratitils í sjóstangaveiði. Á þessum mótum eru í gildi ákveðnar reglur til að keppendur eigi sem jafnasta möguleika á verðlaunum. Þessar reglur gera það af verkum að veiðarnar eru að vissu leiti staðlaðar, þ.e.a.s. svipuð veiðarfæri hafa...
Article
Two year‐classes of Atlantic cod were reared in indoor tanks from November 2002 to November 2004. The average annual mortality was 21% and 36% for males and females respectively. The highest monthly mortality rates in females were observed around and during the spawning periods from March to July, maximally 7% and 20% for year‐class 2001 and 18% an...
Article
Six size groups of hatchery produced turbot (2–499g) were reared at six constant temperatures (10–25°C). The results were used to develop a mathematical model for growth rate and feed conversion in turbot. At each temperature there were linear relationships between logarithms of (a) specific growth rate (G%/day) and body weight (Wg), and (b) feed c...
Article
The effect of thermal environment on condition factor was examined for six different size-classes of Atlantic cod Gadus morhua fed to satiation. A weight–length relationship for 8 to 1303 g fish reared at 4–20°C indicated an allometric growth (W = aLb, a = 0.0045, b = 3.257) of cod. Changes in relative condition factor (Krel) with temperature were...
Article
Results from several laboratory experiments showed that at each temperature there was a linear relationship between the logarithms of specific growth rate (G%/day) and body weight (W g) of Atlantic cod fed to satiation: lnG = α + βlnW. Both α and β were found to be a function of temperature (T °C): α = a + bT + cT2; β = d + eT; a = − 0.7620, b = 0....

Network

Cited By