• E-mailAudrey.Geffen@uib.no
  • Phone+47 928 44 163
  • Visitor Address
    53B Thormøhlensgate
  • Postal Address
    Postboks 7803
    5020 Bergen

Fish Biology, Aquaculture, Larval Fish Biology, Age and Growth, Otolith Shape and Microchemistry

  • Show author(s) (2023). Limited evidence for species-specific sensitivity of temperature-dependent fractionation of oxygen stable isotope in biominerals: A meta-analysis. Methods in Ecology and Evolution.
  • Show author(s) (2023). Can otolith macrostructures be used to reconstruct individual maturity and spawning?
  • Show author(s) (2022). Growth portfolios buffer climate-linked environmental change in marine systems. Ecology. 16 pages.
  • Show author(s) (2021). Set in stones: the influence of long-term environmental changes on Northeast Arctic cod viewed through the analysis of otoliths.
  • Show author(s) (2021). Otolith “spawning zones” across multiple Atlantic cod populations: Do they accurately record maturity and spawning? PLOS ONE. 23 pages.
  • Show author(s) (2021). Linking dispersal connectivity to population structure and management boundaries for saithe in the Northeast Atlantic. Marine Ecology Progress Series. 177-191.
  • Show author(s) (2021). Lemon sole Microstomus kitt in the northern North Sea: a multidisciplinary approach to the early life-history dynamics. Journal of Fish Biology. 569-580.
  • Show author(s) (2021). Elemental composition of illicia and otoliths and their potential application to age validation in white anglerfish (Lophius piscatorius linnaeus, 1758). Estuarine, Coastal and Shelf Science.
  • Show author(s) (2021). Differences in metabolic rate between two Atlantic cod (Gadus morhua) populations estimated with carbon isotopic composition in otoliths. PLOS ONE. 1-19.
  • Show author(s) (2020). Ontogenetic movements of cod in Arctic fjords and the Barents Sea as revealed by otolith microchemistry. Polar Biology. 409-421.
  • Show author(s) (2020). Long-term temporal stability of Northeast Arctic cod (Gadus morhua) otolith morphology. ICES Journal of Marine Science. 1043-1054.
  • Show author(s) (2020). Cophylogenetic analysis of the relationship between anemonefish Amphiprion (Perciformes: Pomacentridae) and their symbiotic host anemones (Anthozoa: Actiniaria). Marine Biology Research. 117-133.
  • Show author(s) (2020). Century-long cod otolith biochronology reveals individual growth plasticity in response to temperature. Scientific Reports. 1-13.
  • Show author(s) (2020). A century of fish growth in relation to climate change, population dynamics and exploitation. Global Change Biology. 5661-5678.
  • Show author(s) (2019). The sustainable use and exploitation of fishes. Journal of Fish Biology. 833-836.
  • Show author(s) (2019). Otoliths as life history indicators.
  • Show author(s) (2019). Investigating long term temporal stability of otolith morphometry of Northeast Arctic cod (Gadus morhua).
  • Show author(s) (2019). Host choice and fitness of anemonefish Amphiprion ocellaris (Perciformes: Pomacentridae) living with host anemones (Anthozoa: Actiniaria) in captive conditions. Journal of Fish Biology. 937-947.
  • Show author(s) (2019). Extensive larval dispersal and restricted movement of juveniles on the nursery grounds of sole in the Southern North Sea. Journal of Sea Research. 1-12.
  • Show author(s) (2019). Author Correction: Gene-associated markers provide tools for tackling illegal fishing and false eco-certification (Nature Communications, (2012), 3, 1, (851), 10.1038/ncomms1845). Nature Communications.
  • Show author(s) (2018). The development and application of stable oxygen isotope records of Arctica islandica (Bivalvia) shells in Holocene marine climatic reconstructions for the northern North Sea.
  • Show author(s) (2018). Spatial gradients and temporal variations in size at age of Northeast Arctic cod (Gadus morhua) off the coast of Norway during the last two decades.
  • Show author(s) (2018). Spatial and temporal dynamics of European hake (Merluccius merluccius) in the North Sea. ICES Journal of Marine Science. 2033-2044.
  • Show author(s) (2018). Molluscan sclerochronology on the Faroe Shelf. Climatic and ecological conditions inferred from shell properties of the bivalve species Arctica islandica.
  • Show author(s) (2017). Large and fine scale population structure in European hake (Merluccius merluccius) in the Northeast Atlantic. ICES Journal of Marine Science. 1300-1310.
  • Show author(s) (2017). Growth, egg production and hatching success of Acartia tonsa cultured at high densities. Aquaculture. 569-578.
  • Show author(s) (2016). Temporal and spatial patterns of reproductive indices of European hake (Merluccius merluccius) in the northern North Sea and Norwegian coastal areas. Fisheries Research. 200-209.
  • Show author(s) (2016). Fish otoliths as indicators in ecosystem based management: Results of the 5th International Otolith Symposium (IOS2014). Marine and Freshwater Research. i-iv.
  • Show author(s) (2015). The use of calcified tissues as tools to support management: The view from the 5th international otolith symposium. ICES Journal of Marine Science. 2073-2078.
  • Show author(s) (2015). The swimming kinematics and foraging behavior of larval Atlantic herring (Clupea harengus L.) are unaffected by elevated pCO2. Journal of Experimental Marine Biology and Ecology. 42-48.
  • Show author(s) (2015). Synergies between aquaculture and fisheries. 491-518. In:
    • Show author(s) (2015). Flatfishes, Biology and Exploitation, 2nd edition. Wiley-Blackwell.
  • Show author(s) (2015). Hvordan studere havets og klimaets historie? 28-34.
  • Show author(s) (2015). Flatfishes, Biology and Exploitation, 2nd edition. Wiley-Blackwell.
  • Show author(s) (2015). Age and Growth. 207-241. In:
    • Show author(s) (2015). Flatfishes, Biology and Exploitation, 2nd edition. Wiley-Blackwell.
  • Show author(s) (2014). The use of otoliths as DNA source in population genetics; population structure of European hake by the use of SNPs.
  • Show author(s) (2014). The proteome of Atlantic herring (Clupea harengus L.) larvae is resistant to elevated pCO2. Marine Pollution Bulletin. 154-160.
  • Show author(s) (2014). Post-settlement growth of hake from the Norwegian coast based on otolith microstructure analysis: Evidence for countergradient variation?
  • Show author(s) (2014). Outlier SNP markers reveal fine-scale genetic structuring across European hake populations (Merluccius merluccius). Molecular Ecology. 118-135.
  • Show author(s) (2014). Otoliths as life history indicators.
  • Show author(s) (2014). Organ damage in Atlantic herring larvae as a result of ocean acidification. Ecological Applications. 1131-1143.
  • Show author(s) (2014). Growth dynamics of European plaice Pleuronectes platessa L. in nursery areas: A review. Journal of Sea Research. 64-82.
  • Show author(s) (2014). Coping with connectivity between populations of Merluccius merluccius: An elusive topic. Journal of Marine Systems. 211-219.
  • Show author(s) (2013). The swimming kinematics of larval Atlantic cod, Gadus morhua L., are resilient to elevated seawater pCO2. Marine Biology.
  • Show author(s) (2013). The development of size variation in Dover sole, Solea solea and turbot, Scophthalmus maximus: genetic variability between different geographical and among year class farmed strains. Aquaculture Research. 1912-1925.
  • Show author(s) (2013). Temperature effect on growth and larval duration of plaice Pleuronectes platessa in three regions of the Northeast Atlantic. Marine Ecology Progress Series. 215-226.
  • Show author(s) (2013). Taxonomic and geographic influences on fish otolith microchemistry. Fish and Fisheries. 458-492.
  • Show author(s) (2013). Influence of the limit of detection on classification using otolith elemental signatures. Canadian Journal of Fisheries and Aquatic Sciences. 922-929.
  • Show author(s) (2013). Fantastically plastic: fish larvae equipped for a new world. Reviews in Aquaculture. S224-S267.
  • Show author(s) (2013). Effects of ocean acidification on the calcification of otoliths of larval Atlantic cod Gadus morhua. Marine Ecology Progress Series. 251-258.
  • Show author(s) (2013). Chemical analysis of otoliths: Cross validation between techniques and laboratories. Fisheries Research. 67-80.
  • Show author(s) (2013). A genomic island linked to ecotype divergence in Atlantic cod. Molecular Ecology. 2653-2667.
  • Show author(s) (2012). The effect of ablation pattern on LA-ICPMS analysis of otolith element composition in hake, Merluccius merluccius. Environmental Biology of Fishes. 509-520.
  • Show author(s) (2012). Severe tissue damage in Atlantic cod larvae under increasing ocean acidification. Nature Climate Change. 42-46.
  • Show author(s) (2012). Seasonal and ontogenic migrations of meagre (Argyrosomus regius) determined by otolith geochemical signatures. Fisheries Research. 154-165.
  • Show author(s) (2012). Otolith oxygen and carbon stable isotopes in wild and laboratory-reared plaice (Pleuronectes platessa). Environmental Biology of Fishes. 419-430.
  • Show author(s) (2012). Mortality in the early life-history of fish: What can we learn from European plaice (Pleuronectes platessa L.)? Journal of Marine Systems. 58-68.
  • Show author(s) (2012). Geographical variations in the chemical compositions of Veined Squid Loligo forbesi statoliths. Zoological Studies. 755-761.
  • Show author(s) (2012). Gene-associated markers provide tools for tackling illegal fishing and false eco-certification. Nature Communications.
  • Show author(s) (2012). Frequent skipped spawning in the world's largest cod population. Proceedings of the National Academy of Sciences of the United States of America. 8995-8999.
  • Show author(s) (2012). Egg development rates for use in egg production methods (EPMs) and beyond. Fisheries Research. 48-62.
  • Show author(s) (2012). Atlantic cod Gadus morhua in the Mediterranean: a surprising immigrant. Marine Ecology Progress Series. 277-280.
  • Show author(s) (2012). A comparison of techniques for measuring the trace element content of human teeth: laser ablation ICP-MS versus solution ICP-MS of micromilled enamel. International Journal of Analytical and Bioanalytical Chemistry. 189-195.
  • Show author(s) (2011). Tracing fish and fish products from ocean to fork using advanced molecular technologies.
  • Show author(s) (2011). Sub-cohort dynamics of 0-group plaice, Pleuronectes platessa L., in the Northern Irish Sea: Settlement, growth and mortality. Journal of Experimental Marine Biology and Ecology. 108-119.
  • Show author(s) (2011). Low-dose exposure to alkylphenols adversely affects the sexual development of Atlantic cod (Gadus morhua): Acceleration of the onset of puberty and delayed seasonal gonad development in mature female cod. Aquatic Toxicology. 136-150.
  • Show author(s) (2011). High-latitude climate variability and its effect on fisheries resources as revealed by fossil cod otoliths. ICES Journal of Marine Science. 1081-1089.
  • Show author(s) (2011). Evaluation of the frequency of skipped spawning in Norwegian spring-spawning herring. Journal of Sea Research. 327-332.
  • Show author(s) (2011). Characterization of herring populations west of the British Isles: an investigation of mixing based on otolith microchemistry. ICES Journal of Marine Science. 1447-1458.
  • Show author(s) (2010). The role of prey concentration and size range in the growth and survival of larval cod. Marine Biology Research. 251-262.
  • Show author(s) (2010). Temporal patterns of spatial genetic structure and effective population size in European plaice (Pleuronectes platessa) along the west coast of Scotland and in the Irish Sea. ICES Journal of Marine Science. 607-616.
  • Show author(s) (2010). Sperm motility in European hake, Merluccius merluccius, and characterization of its spermatozoa concentration and volume, spermatocrit, osmolality and pH. Aquaculture. 31-36.
  • Show author(s) (2010). Seasonality of human site occupation based on stable oxygen isotope ratios of cod otoliths. Journal of Archaeological Science. 78-83.
  • Show author(s) (2010). Multi-disciplinary fingerprints reveal the harvest location of cod Gadus morhua in the northeast Atlantic. Marine Ecology Progress Series. 197-206.
  • Show author(s) (2010). Microchemical variation in juvenile Solea solea otoliths as a powerful tool for studying connectivity in the North Sea. Marine Ecology Progress Series. 211-220.
  • Show author(s) (2010). Lessons learned from stock collapse and recovery of North Sea herring: a review. ICES Journal of Marine Science. 1875-1886.
  • Show author(s) (2010). Does DNA extraction affect the physical and chemical composition of historical cod (Gadus morhua) otoliths? ICES Journal of Marine Science. 1251-1259.
  • Show author(s) (2010). Development, validation and field application of an RNA-based growth index in juvenile plaice Pleuronectes platessa. Journal of Fish Biology. 2181-2209.
  • Show author(s) (2010). Development of Atlantic cod (Gadus morhua) exposed to produced water during early life stages: Effects on embryos, larvae, and juvenile fish. Marine Environmental Research. 383-394.
  • Show author(s) (2009). Variability in transport of fish eggs and larvae. IV. Interannual variability in larval stage duration of immigrating plaice in the Dutch Wadden Sea. Marine Ecology Progress Series. 213-223.
  • Show author(s) (2009). Interannual variability in larval plaice (Pleuronectes platessa L.) immigration in the western Dutch Wadden Sea: which factors are likely causing it? Marine Ecology Progress Series. 213-223.
  • Show author(s) (2009). Advances in herring biology: from simple to complex, coping with plasticity and adaptability. ICES Journal of Marine Science. 1688-1695.
  • Show author(s) (2008). Restricted fish feeding reduces cod otolith opacity. Journal of Applied Ichthyology. 138-143.
  • Show author(s) (2008). Potential variability in the paternal contribution to stock reproductive potential of Northeast Arctic cod (Gadus morhua). Journal of Northwest Atlantic Fishery Science. 71-83.
  • Show author(s) (2008). Estimating reproductive potential of male Barents Sea cod.
  • Show author(s) (2008). Diet overlap and prey selection through metamorphosis in Irish Sea cod (Gadus morhua), haddock (Melanogrammus aeglefinus), and whiting (Merlangius merlangus). Canadian Journal of Fisheries and Aquatic Sciences. 1297-1306.
  • Show author(s) (2008). Climate changes and their effects, as observed using hard tissues analyses.
  • Show author(s) (2008). Back-calculation of previous fish size using individually tagged and marked Atlantic cod (Gadus morhua). Canadian Journal of Fisheries and Aquatic Sciences. 2496-2508.
  • Show author(s) (2007). The effect of Prestige oil ingestion on the growth and chemical composition of turbot otoliths. Marine Pollution Bulletin. 1732-1741 .
  • Show author(s) (2007). The cost of metamorphosis in flatfishes. Journal of Sea Research. 35-45.
  • Show author(s) (2007). Testing an image analysis technique on larval and juvenile fish. A case study of morphometric development of Atlantic cod larvae (Gadus morhua) startfed on rotifers or zooplankton.
  • Show author(s) (2007). Produced water from the offshore oil-industry: Does it have any long-term effect on the reproductive perfomance of Atlantic cod (Gadus morhua)?
  • Show author(s) (2007). Oxygen isotope variation in European hake otoliths: comparing high resolution mass spectrometry and ion probe (SIMS) techniques.
  • Show author(s) (2007). Maternal influences on egg and larval characteristics of plaice (Pleuronectes platessa L.). Journal of Sea Research. 65-77.
  • Show author(s) (2007). High Latitude Climate Variability and Its Effect on Fishery Resources As Revealed by Fossil Otoliths.
  • Show author(s) (2007). Dynamics of shallow-water juvenile flatfish nursery grounds: application of the self-thinning rule. Marine Ecology Progress Series. 231-244.
  • Show author(s) (2007). Conservation aspects of natural populations and captive-bred stocks of turbot (Scophthalmus maximus) and Dover sole (Solea solea) using estimates of genetic diversity. ICES Journal of Marine Science. 1173-1181.
  • Show author(s) (2007). Birth-date selection in early life stages of plaice Pleuronectes platessa in the eastern Irish Sea (British Isles). Marine Ecology Progress Series. 255-269.
  • Show author(s) (2007). Bio-tags and their use against IUU in the Baltic.
  • Show author(s) (2006). Thermal marking of cod otolith (Gadus morhua) for improved traceability.
  • Show author(s) (2006). The origin of Fulton's condition factor - Setting the record straight. Fisheries. 236-238.
  • Show author(s) (2006). The effects of exposure of Atlantic cod spawners to alkylphenols and Produced water on the survival characteristics of their offspring.
  • Show author(s) (2006). The effects of alkylphenols and oil produced water on sperm quality of Atlantic cod (Gadus morhua).
  • Show author(s) (2006). Temperature-dependent development rates of cod (Gadus morhua L.) eggs. Journal of Fish Biology. 1060-1080.
  • Show author(s) (2006). Otolith growth and back-calculation of previous fish size based on tagged and Alizarin multi-marked Atlantic cod (Gadus morhua).
  • Show author(s) (2006). Otolith chemistry: an aid to stock separation of Helicolenus dactylopterus (bluemouth) and Merluccius merluccius (European hake) in the Northeast Atlantic and Mediterranean. ICES Journal of Marine Science. 504-513.
  • Show author(s) (2006). Mesolithic seasonal sea temperatures revealed from stable isotope analysis of cod otoliths.
  • Show author(s) (2006). Mesolithic seasonal sea temperatures revealed from stable isotope analysis of cod otoliths.
  • Show author(s) (2006). Importance of prey abundance and size spectra for growth and survival of larval cod.
  • Show author(s) (2006). Importance of prey abundance and size spectra for growth and survival in larval cod.
  • Show author(s) (2006). Gape morphology of cod (Gadus morhua L.), haddock (Melanogrammus aeglefinus L.) and whiting (Merlangius merlangus L.) through metamorphosis from larvae to juveniles in the western Irish Sea. Journal of Fish Biology. 1379-1395.
  • Show author(s) (2006). Elemental composition of otolith growth marks in three geographically separated populations of European hake (Merluccius merluccius). Marine Biology. 1399-1413.
  • Show author(s) (2006). Effects of Handling and Storage Methods on the Concentrations of Elements in Seep-water Fish Otoliths. Journal of Fish Biology. 891-904.
  • Show author(s) (2006). Assessing Body and Otolith Morphological Differences in Fish with Vaterite and Non-Vaterite Otoliths.
  • Show author(s) (2006). Analysis of fish otoliths by Laser Ablation ICP Mass Spectrometry as a tool for tracing migration of cod.
  • Show author(s) (2005). WESTHER: A multidisciplinary approach to the identification of herring (Clupea harengus L.) stock components west of the British Isles using biological tags and genetic markers. ICES CM 2005/K:01. 18pp. .
  • Show author(s) (2005). Pelagic Ecology: Special considerations for flatfishes.
  • Show author(s) (2005). Metamorfose - forvandling fra larve til yngel. 15 pages.
  • Show author(s) (2005). Intra- and inter-specific effects of temperature on the development rate of marine and estuarine fish embryos.
  • Show author(s) (2005). Aspects of the general biology of Sars’ eelpout, Lycenchelys sarsi (Collett, 1871) (Pisces, Zoarcidae), in Oslofjorden, Norway. Marine Biology Research. 33-38.
  • Show author(s) (2005). Age-related trends in otolith chemistry of Merluccius merluccius from the north-eastern Atlantic Ocean and the western Mediterranean Sea. Marine and Freshwater Research. 599-607.
  • Show author(s) (2005). Age and Growth. 25 pages.
  • Show author(s) (2005). A cooperative effort to exchange age reading experience and protocols between European fish institutes. Fisheries Research. 167-173.
  • Show author(s) (2004). Seasonal and interannual variation in abundance of Calanus finmarchicus (Gunnerus) and Calanus helgolandicus (Claus) in inshore waters (west coast of the Isle of Man) in the central Irish Sea. Journal of Plankton Research. 265-273.
  • Show author(s) (2004). Otolith micro-increment formation in herring Clupea harengus larvae in relation to growth rate. Marine Ecology Progress Series. 83-94.
  • Show author(s) (2004). ICES. Recruitment studies: Manual of precision and accurac of tools. ICES Techniques in Marine Environmental Science. 35 pages.
  • Show author(s) (2004). Analysis of the soluble matrix of vaterite otoliths of juvenile herring (Clupea harengus): do crystalline otoliths have less protein? Comparative Biochemistry and Physiology A. 301-308.
  • Show author(s) (2004). Abundances of Metridia lucens in the western Irish Sea. Journal of the Marine Biological Association of the United Kingdom. 617-618.
  • Show author(s) (2003). Temperature dependent development rates of plaice (Pleuronectes platessa L.) eggs from the Irish Sea. Journal of Plankton Research. 1319-1329.
  • Show author(s) (2003). Otolith microchemistry of Nezumia aequalis (Pisces: Macrouridae) from widely different habitats in the Atlantic and Mediterranean. Journal of the Marine Biological Association of the United Kingdom. 883-886.
  • Show author(s) (2003). Morphometry and composition of aragonite and vaterite otoliths of deformed laboratory reared juvenile herring from two populations. Journal of Fish Biology. 1383-1401.
  • Show author(s) (2003). Cloning, characterization, and developmental expression of a putative farnesoic acid O-methyl transferase in the female edible crab Cancer pagurus. The Biological Bulletin. 308-318.
  • Show author(s) (2002). Length of herring larvae in relation to age and hatching order. Journal of Fish Biology. 479-485.

More information in national current research information system (CRIStin)

See also in Google Scholar:


IMR - Mining effects on marine ecosystems, monitoring: "Gruveutslipp – effekter på marine økosystemer"

Erasmus+ - International Masters Programme "IMBRSea"

EU - Framework 7 – “ARAMACC” Annually-resolved archives of marine climate change – development of molluscan sclerochronology for marine environmental monitoring and climatology. Marie Curie ITN, associated partner

Past Projects

EU - Framework 7 – “FishPopTrace” - The structure of fish populations and traceability of fish and fish products 2008 - 2011

EU - Framework 7 – “CalMarO” - Calcification of Marine Organisms - A Marie Curie ITN (Initial Training Network) concerned with understanding biomineralization and the effects of ocean acidification on calcifying organisms 2008 – 2011

NFR - HAVKYST  - PRIBASE: Pollution Risk and Impact Analysis for the Barents Sea Ecosystem 2009-2011

EEA - Managing effects of global climate on estuarine biodiversity and productivity, network project PT0010, Norway-the Netherlands-Portugal 2008-2012

NFR - The occurrence of skipped spawning and its importance for population dynamics in Northeast Arctic gadoids - 2009 – 2012