A5010706651- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Aquaculture Nutrition and Growth
- Ocean Acidification Effects and Responses
- Reproductive biology and impacts on aquatic species
- Genetic diversity and population structure
- Fish Biology and Ecology Studies
- Physiological and biochemical adaptations
- Isotope Analysis in Ecology
- Identification and Quantification in Food
- Genetic and phenotypic traits in livestock
- Marine animal studies overview
- Coral and Marine Ecosystems Studies
- Parasite Biology and Host Interactions
- Fish biology, ecology, and behavior
- Evolution and Genetic Dynamics
- Food Industry and Aquatic Biology
- Oceanographic and Atmospheric Processes
- Genomics and Phylogenetic Studies
- Animal Behavior and Reproduction
- European and International Law Studies
- Chromosomal and Genetic Variations
- Marine and environmental studies
- Marine and coastal ecosystems
University of Bergen
2016-2025
Norwegian Institute of Marine Research
2016-2025
Metas (Norway)
2016
King Abdullah University of Science and Technology
2015
University of Oslo
2015
Bjerknes Centre for Climate Research
2008
Austevoll Seafood (Norway)
1985-1994
Ecological adaptation is of major relevance to speciation and sustainable population management, but the underlying genetic factors are typically hard study in natural populations due differentiation caused by selection being confounded with drift subdivided populations. Here, we use whole genome sequencing Atlantic Baltic herring reveal architecture at an unprecedented detailed resolution for both a new niche environment timing reproduction. We identify almost 500 independent loci...
The Atlantic herring is a model species for exploring the genetic basis ecological adaptation, due to its huge population size and extremely low differentiation at selectively neutral loci. However, such studies have so far been hampered because of highly fragmented genome assembly. Here, we deliver chromosome-level assembly based on hybrid approach combining de novo Pacific Biosciences (PacBio) with Hi-C-supported scaffolding. comprises 26 autosomes sizes ranging from 12.4 33.1 Mb total...
Norwegian coastal (NC) and northeast Arctic (NA) Atlantic cod (Gadus morhua) larvae were reared on live zooplankton to investigate temperature- size-specific growth. Larval juvenile growth was temperature size dependent. Growth in length weight increased with increasing from 4 14°C, a corresponding reduced larval stage duration. Maximum rate occurred at of 0.1-1.0 mg dry weight, followed by declining trend during the stage. The optimum fed excess is estimated be between 14 16°C, maximum...
Growth rate of tagged juvenile turbot was significantly influenced by the interaction temperature and fish size. The results suggest optimum for growth in size range 25–75 g is between 16 19°C. Optimal decreased rapidly with increasing size, 13 16°C 100 turbot. Although individual rates varied highly at all times within treatments, significant rank correlations were maintained during experimental period. study confirms that exhibit ontogenetic variation optimum, which might partly explain...
Atlantic herring is widespread in North and adjacent waters one of the most abundant vertebrates on earth. This species well suited to explore genetic adaptation due minute differentiation at selectively neutral loci. Here, we report hundreds loci underlying ecological different geographic areas spawning conditions. Four these represent megabase inversions confirmed by long read sequencing. The architecture deviates from expectation under a classical infinitesimal model for complex traits...
Abstract Early life survival is critical to successful replenishment of fish populations, and hypotheses developed under the Growth‐Survival Paradigm (GSP) have guided investigations controlling processes. The GSP postulates that recruitment depends on growth mortality rates during early stages, as well their duration, after which declines substantially. predicts a shift in frequency distribution histories with age towards faster relative initial population because slow‐growing individuals...
Abstract We developed and validated a mixed-stock analysis (MSA) method with 59 single-nucleotide polymorphisms selected from genome-wide data to assign individuals populations in samples of Atlantic herring the North Baltic seas. analysed 3734 spawning locations scientific catches mixed feeding stocks demonstrate “one-fits-all” tool unprecedented accuracy for monitoring spatio-temporal dynamics throughout large geographical range complex stock mixing. re-analysed time-series (2002–2021)...
Abstract Analysis of stable oxygen isotopes in otoliths is a promising technique for estimating the ambient temperature experienced by fish, but consistent equations relating and fractionation among different fish species are lacking. Juvenile cod were reared at constant temperatures from 6 to 20°C sagittal analysed isotope values. We determined that temperature-dependent was close reported inorganic aragonite low temperatures, there deviations other species. The linear relationship between...
This study presents the first intraspecific evaluation of larval growth performance across several different experimental scales, environments, and regions a marine fish species. Size- temperature-dependent models for early juvenile Atlantic cod (Gadus morhua) are developed based on selected laboratory experiments with fed in excess. Observed sizes-at-age from stocks compared predictions using initial size ambient temperature history as inputs. Comparisons results other reveal that model...
The ratio of tissue RNA to DNA (R/D) is a widely used index recent growth and nutritional condition in larval juvenile fish. To date, however, no standard technique for measuring nucleic acids has been adopted. Because methodological details can affect the estimate R/D, researchers using different analytical protocols have unable compare ratios directly. Here, we report on results an international interlaboratory calibration 4 spectrofluorometric quantify acids. Replicate sets 5 samples 2...
Sexual dimorphism in growth and maturation of individually tagged turbot (n= 421), Scophthalmus maximus Rafinesque, was studied a long-lasting (20 months) experiment with four temperature regimes. The influence onset puberty subsequent on evaluated. There were no initial size differences, but the final weight females larger than that males at all regimes, except lowest temperature. Surplus energy (sum increase somatic gonad weight) average greater from 8 months prior to first spawning....
The dissolution of anthropogenically emitted excess carbon dioxide lowers the pH world's ocean water. larvae mass spawning marine fishes may be particularly vulnerable to such acidification (OA), yet generality earlier results is unclear. Here we show detrimental effects OA on development a commercially important fish species, Atlantic herring (Clupea harengus). Larvae were reared at three levels CO2: today (0.0385 kPa), end next century (0.183 and coastal upwelling scenario (0.426 under...
The Atlantic herring is one of the most abundant vertebrates on earth but its nucleotide diversity moderate (π = 0.3%), only three-fold higher than in human. Here, we present a pedigree-based estimation mutation rate this species. Based whole-genome sequencing four parents and 12 offspring, estimated 2.0 × 10-9 per base generation. We observed high degree parental mosaicism indicating that large fraction these de novo mutations occurred during early germ cell development. – lowest among...
Animals partition and trade off their resources between competing needs such as growth, maintenance, reproduction. Over a lifetime, allocation strategies should result in distinct trajectories for survival, reproduction, but longitudinal individual data are difficult to reconstruct wild animals especially marine fish. We were able two of these wild-caught Northeast Arctic cod (Gadus morhua) females: size-at-age was back-calculated from otolith growth increments, recent spawning history...
The evolutionary process that occurs when a species colonizes new environment provides an opportunity to explore the mechanisms underlying genetic adaptation, which is essential knowledge for understanding evolution and maintenance of biodiversity. Atlantic herring has estimated total breeding stock about 1 trillion (10 12 ) colonized brackish Baltic Sea within last 10,000 y. Minute differentiation between populations at selectively neutral loci combined with this rapid adaptation...
The mechanisms underlying sex determination are astonishingly plastic. Particularly the triggers for molecular machinery, which recalls either male or female developmental program, highly variable and have evolved independently repeatedly. Fish show a huge variety of systems, including both genetic environmental triggers. advent chromosomes is assumed to stabilize determination. However, because notoriously cluttered with repetitive DNA pseudogenes, study their evolution hampered. Here we...
Growth, feed conversion efficiency and frequencies of skeletal deformities were studied in juvenile Atlantic cod (Gadus morhua) that had been startfed on either rotifers (rotifer group) or zooplankton (zooplankton group). After metamorphosis, the fish reared at four constant temperatures (7, 10, 13, 16°C) moved successively from 16 to 13 10°C (T-step, average 13.2°C). The group a consistently higher growth rate all studied. Further, food intake (20%) ratio (1.65 vs. 1.31). In addition,...