A5007146801- Fish Ecology and Management Studies
- Reproductive biology and impacts on aquatic species
- Marine and fisheries research
- Aquaculture Nutrition and Growth
- Fish Biology and Ecology Studies
- Marine Bivalve and Aquaculture Studies
- Aquaculture disease management and microbiota
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Food Industry and Aquatic Biology
Technical University of Denmark
2015-2024
Danish Centre for Marine Research
2013
Norwegian Institute of Marine Research
2009-2010
Centre for Environment, Fisheries and Aquaculture Science
2010
The timing and success of spawning in marine fish are fundamental importance to population persistence distribution and, for commercial species, sustainability. Their physiological processes reproduction regulated, part, by water temperature, therefore changes climate may have dramatic effects on performance. Using adult Atlantic cod ( Gadus morhua ) as a case study, we examined the links between body size, vitellogenesis, time conducting extensive laboratory field studies. Our experiments...
Chronological records of elemental concentrations in fish otoliths are a widely used tool to infer the environmental conditions experienced by individual fish. To interpret signals within otolith, it is important understand how both external and internal factors impact ion uptake, transport incorporation. In this study, we have combined chronological from archival data storage tags quantify influence (sex, size, age, growth) (temperature, depth, salinity) on otolith chemistry cod ( Gadus...
Abstract Long time series of reliable individual growth estimates are crucial for understanding the status a fish stock and deciding upon appropriate management. Tagging data provide valuable information about growth, especially useful when age‐based assessments compromised by age‐determination uncertainties. However, in literature there is lack studies assessing possible changes over using tagging data. Here, from experiments performed Baltic Sea between 1971 2019 were added to those...
Accurate age data are essential for reliable fish stock assessment. Yet many stocks suffer from inconsistencies in interpretation. A new approach to obtain makes use of the chemical composition otoliths. This study validates periodicity recurrent patterns 25 Mg, 31 P, 34 K, 55 Mn, 63 Cu, 64 Zn, 66 85 Rb, 88 Sr, 138 Ba, and 208 Pb Baltic cod (Gadus morhua) otoliths tag–recapture known-age samples. Otolith P concentrations showed highest consistency seasonality over years, with minima...
We examined the effect of dietary arachidonic acid (ARA) and eicosapentaenoic (EPA) on production embryos hatched larvae in European eel, Anguilla anguilla. Two diets with high intermediate levels ARA low EPA (Feed 1: 1.9%, 4.2%; Feed 2: 1.2%, 5.1% total fatty acids) were tested against a commercial diet (DE: ARA: 0.5%, EPA: 8.2% acids). After 24 weeks feeding, muscles ovaries increased to 0.9% 1.3% acids, respectively, 1 significantly higher than 2 DE. Female broodstock was not fed during...
Abstract Ndjaula, H. O. N., Hansen, T., Krüger-Johnsen, M., and Kjesbu, S. 2009. Oocyte development in captive Atlantic horse mackerel Trachurus trachurus. – ICES Journal of Marine Science, 66: 623–630. This 13-month experimental study focused on developing oocyte production 101 adult female mackerel. In addition, proxies energy patterns relation to were investigated. The fish captured off western Norway fed satiation from October 2005 November 2006 two replicate adjacent circular tanks....
Knowledge of the movement patterns and area utilisation commercially important fish stocks is critical to management. The Eastern Baltic cod Gadus morhua , one most ecologically in Sea, currently severely impacted Europe. During last 2 decades, this stock has experienced drastic decreases population size, distributional range, individual growth body condition, all which may have affected movements between different areas Sea. In study, we investigated seasonal by re-analysing historical...
Advection (directional movement) and diffusion (dispersed were applied for the first time to describe movement patterns in Atlantic cod North Sea Baltic between 1955 2020. The advection-diffusion approach provided more detailed estimates of that corresponded previously observed using different analytical techniques. Spatial evident with greater distances from eastern compared western Kattegat-Skagerrak. Furthermore, comparative case studies on ecotypes suggested inshore resident offshore...