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  • 2000-2004  (10)
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Year
  • 1
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    Fish stock development in the central Baltic Sea (1976-2000) in relation to variability in the environment (2003)
    ICES
    In:  ICES Marine Science Symposia, 219 . pp. 294-306.
    Details
    Publication Date: 2018-03-20
    Description: Fish stock development in the Central Baltic Sea (1976-2000) in relation to variability in the environment - DTU Orbit (15/04/14) Fish stock development in the Central Baltic Sea (1976-2000) in relation to variability in the environment - DTU Orbit (15/04/14) Köster F, Möllmann C, Neuenfeldt S, Vinther M, St. John M, Tomkiewicz J et al. Fish stock development in the Central Baltic Sea (1976-2000) in relation to variability in the environment. I C E S Marine Science Symposia. 2003;219:294-306
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Fish predation control of key copepod species in the Bornholm Basin (2004)
    GLOBEC International Project Office
    In:  GLOBEC International Newsletter, 10 (1). pp. 15-17.
    Details
    Publication Date: 2018-10-11
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 3
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    A new retention index for the Central Baltic Sea: long-term hydrodynamic modelling used to improve Baltic sprat recruitment models (2004)
    GLOBEC International Project Office
    In:  GLOBEC International Newsletter, 10 (1). pp. 10-11.
    Details
    Publication Date: 2018-10-11
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 4
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    Spatial and temporal variability in the stomach content of herring and sprat in the Bornholm Basin (2001)
    In:  [Paper] In: ICES Council Meeting 2001, 26.-29.09.2001, Oslo, Norway .
    Details
    Publication Date: 2020-04-24
    Description: Herring and sprat stomachs and zooplankton samples were collected on 8 sites in the Bornholm Basin in May/June 1999 at different times of the day. Sprat showed a distinct increase in stomach content from early morning to the afternoon, whereas the stomach content of herring remained rather constant. Both herring and sprat showed a clear dominance of mesozooplankton in food composition with only small contributions of makrozooplankton and ichthyo-plankton. Both clupeid species showed similar preferences in selection of food items with a dominance of the copepods P. elongatus and T. longicornis. Compared to herring, other copepod species, especially Acartia spp. contributed to a larger extent to the food of sprat. Cladocerans played a less important role as food for both species. Spatial differences in stomach content have been revealed between the sampling sites. These resulted from differences in the distribution of food organisms in the water column as well as a different vertical distribution of the predators at different times of day. The share of juvenile copepods in herring stomachs was bigger than in sprat stomachs. Generally, selective feeding seemed to be stronger developed in sprat than in herring.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Conference paper
  • 5
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    Modelling the influences of atmospheric forcing conditions on Baltic cod early life stages: distribution and drift (2003)
    Elsevier
    In:  Journal of Sea Research, 49 . pp. 187-201.
    Details
    Publication Date: 2019-09-23
    Description: Retention or dispersion of larvae from the spawning ground has been identified as one of the key processes influencing recruitment success in fish stocks. An exercise combining 3-D hydrodynamic model simulations and field data on spatial distributions of juvenile Baltic cod was utilised to investigate the potential drift of larvae from the centre of main spawning effort in the Bornholm Basin, Baltic Sea. In the simulations cod larvae were represented as Lagrangian drifters. Habitats in which larvae and juvenile cod potentially dwell and where juveniles settle were identified to ascertain the importance of predicting transport. The transport of Baltic cod larvae was investigated by detailed drift model simulations for the years 1986 to 1999. The results yielded a clear dependency on wind-induced drift of larval cod, which is mainly controlled by the local atmospheric conditions over the Baltic Sea. Seasonally averaged distributions of drifters were compared with actual distributions of 0-group cod, as determined from bottom and pelagic trawl surveys conducted in autumn of the years 1993 to 2000 in and around the Bornholm Basin. The results suggest that juveniles caught in different areas can be assigned to different times of the spawning season. Because of seasonal differences in the circulation patterns, the southern coastal environment is on average most important for early and late spawners, whereas larvae hatching in mid-summer were on average transported towards the north or to a higher degree remained in the spawning ground.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S1385-1101(03)00006-6
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  • 6
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    Trophodynamic control on recruitment success in Baltic cod: The influence of cannibalism (2000)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 57 . pp. 300-309.
    Details
    Publication Date: 2019-09-23
    Description: Cod is the top piscivore predator in the Baltic Sea ecosystem. Based on stomach content data from 62 427 cod collected during 1977–1994 and food consumption rates, cannibalism in the Eastern and Western Baltic cod stocks has been quantified using multispecies virtual population analysis. In the Eastern Baltic stock, depending on model assumptions, an average of 25–38% of the 0-group and 11–17% of the 1-group were removed by predation by adults. Thus, between age 0 and age 2 a year class may lose on average about 31% and 44% of the initial number as a result of cannibalism. Cannibalism is lower in the Western Baltic. On average, 19% of the 0-group and 9% of the 1-group are consumed per year, i.e. 24% of the initial cohort is eaten before reaching age 2. Predation was most intense in 1978–1984, a period with high juvenile abundance and large adult stock sizes in both areas. Subsequently, stock, recruitment, and cannibalism declined steadily until the early 1990s and then increased again. Problems identified in relation to data compilation and estimation procedure are discussed with respect to their impact on estimates of cannibalism and stock– recruitment relationships
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.2000.0647
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  • 7
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    Comparing the feeding habits of co-occurring sprat (Sprattus sprattus) and cod (Gadus morhua) larvae in the Bornholm Basin, Baltic Sea (2003)
    Elsevier
    In:  Fisheries Research, 63 (1). pp. 97-111.
    Details
    Publication Date: 2017-01-09
    Description: The feeding habits of co-occurring Baltic sprat (Sprattus sprattus) and cod (Gadus morhua) larvae have been studied in the Bornholm Basin, Baltic Sea during 12 cruises covering the spawning seasons in 1987 and 1988. The seasonal and size-dependant diet composition is described based on Bongo-net samples. Contrary to investigations from other areas, first-feeding larvae of both species included almost no phytoplankton in their diet. Feeding started on calanoid copepod nauplii which were the dominating food item. Copepodite stages I–V and finally adult copepods were eaten with increasing larval length. Only sprat larvae used cladocerans additionally as food source of considerable importance. Cod larvae included copepodites/copepods in their diet at smaller total lengths than sprat larvae. The trophic niche breadth of both species did not increase with larval length. The feeding selectivity of different sized sprat and cod larvae (Pearre’s C-index) was calculated based on vertical resolving sampling of predator and prey. The results indicate a strong preference of sprat larvae for different developmental stages of Acartia spp., a species showing a pronounced increase in standing stock since the 1980s. Cod larvae selected Pseudocalanus elongatus, a species which decreased in biomass. Possible implications for recruitment levels of both species are discussed.
    Type: Article , PeerReviewed
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  • 8
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    Trophodynamic control by clupeid predators on recruitment success in Baltic cod? (2000)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 57 . pp. 310-323.
    Details
    Publication Date: 2017-03-07
    Description: Throughout the 1980s, reproductive success of the top-predator cod declined and stock sizes of the main prey species herring and especially sprat, important planktivorous predators in the system, increased substantially. Although the hydrographic conditions conducive for survival of early life stages improved during the 1990s, recruitment success of cod remained far below average. As clupeids have been identified as major predators on cod eggs and larvae in the Baltic, increased predation may be an important factor hampering stock recovery. Results from stomach content analysis of herring and sprat during the spawning season of 1988–1995 and ichthyoplankton surveys in the Bornholm Basin (the only important spawning area of cod in the Central Baltic in this period) allow a comparison of estimated consumption rates by the predator populations with standing stocks and production rates of cod eggs and larvae. Despite uncertainties in the estimation procedure, the findings confirm substantial predation on cod eggs by both clupeid species. Especially at the beginning of the cod-spawning season, characterized by low zooplankton availability, sprat consumed a considerable proportion of the eggs produced. In 1993, the relative importance of zooplankton as prey increased, while fish eggs were encountered more rarely. In contrast, predation by herring remained on the same level or even increased, especially late in the spawning season. The larval stage of cod is not substantially affected by predation owing to limited spatial overlap between prey and predator.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.1999.0528
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  • 9
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    Estimating Baltic sprat (〈em〉Sprattus sprattus balticus〈/em〉 S.) population sizes from egg production (2004)
    Elsevier
    In:  Fisheries Research, 69 (3). pp. 313-329.
    Details
    Publication Date: 2017-01-09
    Description: The sprat (Sprattus sprattus balticus S.) population size in the Bornholm Basin, one of the major spawning areas of the species in the Baltic Sea, was estimated with the daily egg production method. Egg abundance, stock structure, sexual and gonadal maturation, spawning frequency and the batch fecundity of sprat throughout the sprat spawning season were simultaneously investigated to obtain an estimate of the population size at spawning time. The results confirmed the population estimate from a hydroacoustic survey, but contrasted spatially down-scaled results from an area dis-aggregated stock assessment model applying fisheries statistics. Conflicting results from both latter methods have previously hampered quantitative studies on recruitment processes of sprat and cod, for example the estimation of predation pressure on cod eggs by sprat. The egg production method did not allow an estimation of the population size of sprat in the entire assessment area larger than the Bornholm Basin, i.e. ICES sub-division 25. This failure is caused by sprat spawning activity outside the Bornholm Basin, not covered by the standard egg surveys and has consequences for the general applicability of available egg abundance time series to retrospectively estimate sprat stock development.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.fishres.2004.06.005
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  • 10
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    Biodiversity and species-environment relationships of the demersal fish assemblage at the Great Meteor Seamount (subtropical NE Atlantic), sampled by different trawls (2002)
    Springer
    In:  Marine Biology, 141 . pp. 185-199.
    Details
    Publication Date: 2018-06-07
    Description: Quantitative data collected with different bottom trawls at the Great Meteor Seamount (subtropical NE Atlantic, 30°N; 28.5°W) in 1967, 1970 and 1998 are compared. Bootstrap estimates of total catch per unit effort increased from 6.96 and 10.8 ind. m–1 h–1 in 1967 and 1970, respectively, to 583.98 ind. m–1 h–1 in 1998. Gear effects and an effect of gear over time accounted for 47.1% and 20% of species variability. Further significant factors were time of day and habitat, while season was not significant. A total of 43 species was collected. Including supplementary species information, a grand total of 46 species was found associated with the Great Meteor Seamount. Diversity was higher in 1967 and 1970 (Shannon's diversity: H′=2.5 and 1.6) than in 1998 (H′=0.9). Species–environment relationships are discussed in terms of a sound-scattering layer–interception hypothesis, i.e. utilisation of prey from a diurnally moving sound-scattering layer for the bentho-pelagic community. This is probably augmented by concentration effects in a circular current around the seamount (Taylor-column). Long-term changes are discussed with respect to a decrease in biodiversity due to considerable increases in Macroramphosus scolopax and Capros aper. In 1998, the increase of abundance of Trachurus picturatus and the respective decreases for genuine benthic species were likely to have been caused by a change of gear.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00227-002-0804-y
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