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Gonadal development and sex steroids in a female Arctic charr broodstock
Gonadal development and plasma levels of sex steroids were investigated in female Arctic charr at 3-week intervals over a 12-month period. Circulating levels of oestradiol-17β (E2), testosterone (T)… Expand
Seasonal variation in biomarkers in blue mussel (Mytilus edulis), Icelandic scallop (Chlamys islandica) and Atlantic cod (Gadus morhua): implications for environmental monitoring in the Barents Sea.
In the Barents Sea, the limited data on biological relevant indicators and their responses to various anthropogenic stressors have hindered the development of a consistent scientific basis for… Expand
Effects of photoperiod on sex steroids and gonad maturation in Arctic charr
Abstract Four groups of Arctic charr (age 3+), previously exposed to natural photoperiod, were subjected to different photoperiod regimes from February 20: Simulated natural photoperiod (SNP; Tromso… Expand
Toxicity of crude oil and pyrene to the embryos of beach spawning capelin (Mallotus villosus).
- M. Frantzen, Inger-Britt Falk-Petersen, +4 authors L. Camus
- Biology, Medicine
- Aquatic toxicology
- 1 February 2012
Due to a northward shift in oil and gas activities, there is an increasing need to understand the potential anthropogenic impacts of oil-related compounds on sub-Arctic and Arctic organisms,… Expand
Milt characteristics of diploid and triploid Atlantic cod (Gadus morhua L.)
The work compares the characteristics of milt produced by diploid and triploid Atlantic cod in terms of sperm motility, density, DNA content, seminal-fluid composition and the ability of sperm to… Expand
Effects of fasting on temporal changes in plasma concentrations of sex steroids, growth hormone and insulin‐like growth factor I, and reproductive investment in Arctic charr
Proportions of maturing fish and reproductive output [egg size relative fecundity, spermatocrit and gonado-somatic index (I G )] were studied in repeat-spawning (+4 year old) male and female Arctic… Expand
Physiological stress responses in spotted wolffish (Anarhichas minor) subjected to acute disturbance and progressive hypoxia
Abstract The spotted wolffish (Anarhichas minor) is considered a promising species for coldwater aquaculture. It is a sedentary, bottom-dwelling fish which exhibits a calm and “non-stressed”… Expand
Early life stages of an arctic keystone species (Boreogadus saida) show high sensitivity to a water-soluble fraction of crude oil.
- J. Nahrgang, P. Dubourg, M. Frantzen, D. Storch, Flemming T. Dahlke, J. Meador
- Biology, Medicine
- Environmental pollution
- 1 November 2016
Increasing anthropogenic activities in the Arctic represent an enhanced threat for oil pollution in a marine environment that is already at risk from climate warming. In particular, this applies to… Expand
Effects of chronic dietary petroleum exposure on reproductive development in polar cod (Boreogadus saida).
Increasing human activities in the Arctic raise the risk of petroleum pollution, thus posing an elevated risk for Arctic organisms to be chronically exposed to petroleum compounds. The endocrine… Expand
Metal speciation of historic and new copper mine tailings from Repparfjorden, Northern Norway, before and after acid, base and electrodialytic extraction
- K. Pedersen, P. Jensen, L. Ottosen, A. Evenset, G. Christensen, M. Frantzen
- Environmental Science
- 1 June 2017
Abstract In Kvalsund, Northern Norway, a permit for submarine mine tailings disposal in Repparfjorden was recently issued for a copper mine with expected operation from 2019. A copper mine was active… Expand