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  • 1
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    Juvenile Atlantic herring (Clupea harengus) use a time-compensated sun compass for orientation (2022)
    The Company of Biologists
    In:  EPIC3Journal of Experimental Biology, The Company of Biologists, 225(18), pp. jeb244607-, ISSN: 0022-0949
    Details
    Publikationsdatum: 2023-10-12
    Beschreibung: Atlantic herring (Clupea harengus), an ecologically and economically important species in the northern hemisphere, shows pronounced seasonal migratory behaviour. To follow distinctive migration patterns over hundreds of kilometers between feeding, overwintering and spawning grounds, they are probably guided by orientation mechanisms. We tested whether juvenile spring-spawning Atlantic herring, caught in the western Baltic, use a sun compass for orientation just before they start leaving their hatching area. Fish were randomly divided into two groups, one of them clock-shifted 6 h backwards, to investigate whether they shift their orientation direction accordingly. Individual fish were placed in a circular bowl and their orientation was tested multiple times with the sun as a sole visual orientational cue. Our results show for the first time that juvenile Atlantic herring use a time-compensated sun compass during their migration. Their swimming direction was impaired, but still present, even when the sky was very cloudy, indicating additional orientation capabilities.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , peerRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Growth of Atlantic herring larvae (Clupea harengus L.) in response to climatic long term trends (NAO) and to hydrographical features in the Northern Sea in the period 1990-1997 (1999)
    ICES
    In:  [Paper] In: ICES Council Meeting 1999, 29.09.-02.10.1999, Stockholm, Sweden .
    Details
    Publikationsdatum: 2017-01-06
    Beschreibung: Herring larvae were sampled during the lllLS in the ICES area IVa from 1990 to 1997. Larval growth was determined based on otolith microstructure analysis from larvae of 7-25mm standard length. The data were correlated to the North Atlantic Oscillation (NAO) and the intlow of Atlantic water (AW) at the same period. The study showed a strong correlation between positive NAO years with a higher inflow of AW and subsequently higher larval growth rates. which could be an indication of favorable growth conditions
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in Konferenzband
  • 3
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    The use of multivariate morphometrics to determine the nutritional condition of marine fish larvae (1991)
    ICES
    In:  [Paper] In: ICES Annual Science Conference 1991, 26.09.1991, La Rochelle, France .
    Details
    Publikationsdatum: 2017-01-06
    Beschreibung: The usefulness of multivariate morphometrics to distinguish between fed and starved fish larvae was tested on laboratory reared herring larvae (Clupea harengus ). Linear Discriminant Analysis was used to obtain a linear function which separates the two groups of larvae maximally. The calculations were based on twelve morphometric characters, taken individually by means of an image analysing system. A statistically significant separation of fed and starved larvae was obtained. The most important characters and the number of characters necessary for separation are outlined.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in Konferenzband
  • 4
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    Demonstrations of maternal effects of Atlantic cod: combining the use of unique mesocosm and novel molecular techniques - a new EU-project (2000)
    ICES
    In:  [Paper] In: ICES Annual Science Conference 2000, 27.-30.09.2000, Brügge, Belgium ; pp. 1-20 .
    Details
    Publikationsdatum: 2017-01-06
    Beschreibung: One of the effects of fishing is a reduction in average age and size in exploited fish stocks, leading to an increasing proportion of recruit spawners in the stock. Current management practice assumes equal viability of offspring from first time spawners and from repeat spawners, despite the fact that that first time spawners often produce smaller eggs than older spawners. The aim of this EU-project is to follow offspring from families of first time spawning and older cod, reared under identical and semi-natural conditions in marine enclosures (mesocosms). The parental origin of the larvae is identified using microsatellite DNA methodology. The advantage of this approach, compared to traditional laboratory rearing, is that rearing conditions are close to natural conditions, and all larvae are reared in the same environment. This eliminates the tank-to-tank variability often observed in traditional rearing experiments. The fish are reared from hatching, through the larval and juvenile stages, until sexual maturity. Growth rates, survival and nutritional condition will be measured using methods such as RNA/DNA ratio and otolith micro increment analysis. The results will be related to parental origin and quality measures of the eggs. It is intended to incorporate the results into management models for improvement of fishery management strategies. In this paper we will focus on a description of the project
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in Konferenzband
  • 5
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    Effects of photoperiod and temperature on recent growth rates of sprat larvae in the Baltic Sea (2011)
    ICES
    In:  [Paper] In: ICES Annual Science Conference , 21.09.2011, Gdansk, Poland .
    Details
    Publikationsdatum: 2017-01-09
    Beschreibung: Growth rate has been shown to effect survival and recruitment of marine fishes. How growth rates in the field are affected by larval development and environmental variability is poorly understood. Recent growth rates of sprat larvae, a key species in the Baltic Marine ecosystem, were determined by converting RNA/DNA ratios determined from individual larvae into recent growth based on a laboratory calibrated RNA/DNA temperature growth model. Several factors (larval size, temperature and photoperiod) that may contribute to the observed variability in recent growth sampled in the spawning seasons 2002 through 2004 were analyzed with a variety of models. Best fit was found for the Generalized Additive Models (GAMs). Larval size (dry weight), photoperiod and temperature terms explained 29 % and 36 % of the variability observed in recent growth of sprat larvae in the Baltic Sea, respectively.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in Konferenzband
  • 6
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    Comparison of biochemical and histological methods for the evaluation of the in situ nutritional condition of marine fish larvae (1989)
    ICES
    In:  [Paper] In: ICES Annual Science Conference 1989, 05.10.1989, Den Haag, Netherlands .
    Details
    Publikationsdatum: 2017-01-06
    Beschreibung: To estimate the importance of starvation induced mortality for recruitment of marine fish larvae three distinct methods were applied to determine the nutritional condition of fish larvae in situ. In addition to highly sensitive fluorescence techniques for analysing RNA/DNA ratios and tryptic enzyme activities histological standard methods were used to compare the nutritional status of fish larvae of the genus Vinciguerria (Photichthyidae) caught in two ecologically different areas of the Indian Ocean: In the central Arabian Sea and on the continental shelf of Pakistan. A comparison of the results elaborated by the distinct methods shows a trend towards better nutritional conditions for fish larvae from the offshore region.
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in Konferenzband
  • 7
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    Laboratory studies on RNA/DNA ratios of starved and fed herring (Clupea harengus) and turbot (Scophthalmus maximus) larvae (1987)
    ICES | Oxford Univ. Press
    In:  Journal du Conseil / Conseil Permanent International pour l'Exploration de la Mer, 43 . pp. 122-128.
    Details
    Publikationsdatum: 2019-08-08
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/43.2.122
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 8
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    Juvenile Atlantic herring (Clupea harengus) use a time-compensated sun compass for orientation (2022)
    The Company of Biologists
    Details
    Publikationsdatum: 2024-02-07
    Beschreibung: Atlantic herring (Clupea harengus), an ecologically and economically important species in the northern hemisphere, shows pronounced seasonal migratory behaviour. To follow distinctive migration patterns over hundreds of kilometers between feeding, overwintering and spawning grounds, they are probably guided by orientation mechanisms. We tested whether juvenile spring-spawning Atlantic herring, caught in the western Baltic, use a sun compass for orientation just before they start leaving their hatching area. Fish were randomly divided into two groups, one of them clock-shifted 6 h backwards, to investigate whether they shift their orientation direction accordingly. Individual fish were placed in a circular bowl and their orientation was tested multiple times with the sun as a sole visual orientational cue. Our results show for the first time that juvenile Atlantic herring use a time-compensated sun compass during their migration. Their swimming direction was impaired, but still present, even when the sky was very cloudy, indicating additional orientation capabilities.
    Materialart: Article , PeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 9
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    Time-compensated sun compass in juvenile sprat ( Sprattus sprattus ) reveals the onset of migratory readiness (2024)
    The Company of Biologists
    Details
    Publikationsdatum: 2024-04-22
    Beschreibung: Sprat (Sprattus sprattus) is one of the most commercially exploited fish species in the Baltic Sea and expresses a pronounced seasonal migration pattern. Spawning takes place, among other places, in the Kiel Bight and Kiel Fjord in early summer. Juvenile sprat leave the nursery areas in late summer/early autumn to move to their feeding and overwintering grounds. What kind of orientation mechanisms sprat use for migration is not known yet. This study shows that juvenile sprat can use a time-compensated sun compass, heading towards the northeast, in the direction of their proposed overwintering grounds in Bornholm Basin. The sprats tested at the end of August oriented themselves in the predicted direction, whereas the sprats tested at the beginning of August only showed a random orientation. For the first time, this demonstrates the onset of migratory readiness in juvenile sprat, indicating the preparation for starting their migration.
    Materialart: Article , PeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
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