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  • OceanRep  (18)
  • OceanRep: Article in a Scientific Journal - peer-reviewed  (18)
  • 2005-2009  (18)
  • 1
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    Comparative nutritional condition of larval dab Limanda limanda and lesser sandeel Ammodytes marinus in a highly variable environment (2007)
    Inter Research
    In:  Marine Ecology Progress Series, 334 . pp. 205-212.
    Details
    Publication Date: 2019-09-23
    Description: We investigated the nutritional condition of larval fishes caught in daily ichthyoplankton hauls in the ‘Helgoland Roads’ (54°11.18’N and 07°54.00’E) from February to June 2004. We concentrated on larvae of dab Limanda limanda and lesser sandeel Ammodytes marinus in order to compare early life stages of iteroparous and nearly semelparous fish. We analysed length, weight and RNA:DNA ratios as a proxy for condition of the larvae. The relationship between larval nutritional condition and larval size provided an indication of condition-selective mortality due to a loss of larvae in poor condition from the larger size-classes. For the sandeel, larvae in good condition were present in all size-classes, whereas for the dab maximum larval condition increased with increasing size. Variability in both standard length and condition was high in the 2 species during their planktonic stage. Both species showed good nutritional condition in the early to mid portion of the recruitment period and declines in condition in late April. This was more pronounced in larval dab, which showed a higher dependency on feeding conditions than larval sandeel. Together, these findings indicate a more conservative strategy of early life stages of the nearly semelparous sandeel compared with the iteroparous dab.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps334205
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    The influence of different salinity conditions on egg buoyancy and development and yolk sac larval survival and morphometric traits of Baltic Sea sprat (Sprattus sprattus balticus Schneider) (2009)
    Instituto de Ciencias del Mar - CSIC
    In:  Scientia Marina, 73 (S1). pp. 59-72.
    Details
    Publication Date: 2016-09-08
    Description: The small pelagic sprat (Sprattus sprattus) is a key ecologic player in the Baltic Sea. However, there is long-term variability in recruitment which is thought to be influenced by fluctuations in abiotic and biotic conditions experienced during the early life stages. This study concentrates on the influence of different ambient salinities on sprat egg development, egg buoyancy and survival as well as early yolk sac larval morphometric traits. Egg buoyancy significantly decreased with increasing salinity experienced during fertilization and/or incubation experiments. Field egg buoyancy measurements in 2007 and 2008 exhibited annual and seasonal differences in specific gravity, potentially associated with changes in adult sprat vertical distribution. Neither egg development time nor the duration of the yolk sac phase differed among salinity treatments. At eye pigmentation, larval standard length exhibited high variance among individuals but did not differ among treatments. The largest ecological impact of salinity experienced during spawning was the modification the buoyancy of eggs and yolk sac larvae, which determines their vertical habitat in the Baltic Sea. There are strong thermo- and oxyclines in the Baltic Sea, and thus salinity can indirectly impact
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3989/scimar.2009.73s1059
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Invading Mnemiopsis leidyi as a potential threat to Baltic fish (2007)
    Inter Research
    In:  Marine Ecology Progress Series, 349 . pp. 303-306.
    Details
    Publication Date: 2018-06-01
    Description: The occurrence of the ctenophore Mnemiopsis leidyi as a new invasive species in the Baltic Sea and the potential consequences for fish stock recruitment was investigated in spring 2007. The study focused on the Bornholm Basin, which serves as the major spawning ground for cod and sprat, the commercially most important fish stocks in the Baltic. The distribution pattern of M. leidyi revealed a substantial overlap with cod eggs. The observed predation of M. leidyi on eggs has the potential to alter the recruitment success of cod, which is the top predator in the system and, thus, to change the Baltic food-web structure.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps07283
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Depth-dependent nutritional condition of sprat Sprattus sprattus larvae in the central Bornholm Basin, Baltic Sea (2007)
    Inter Research
    In:  Marine Ecology Progress Series, 341 . pp. 217-228.
    Details
    Publication Date: 2018-06-01
    Description: Bimodal depth distribution patterns observed for sprat Sprattus sprattus larvae in previous field studies conducted in the deep basins of the Baltic Sea have led researchers to hypothesise that larval sprat condition was depth-dependent. We examined this hypothesis by measuring morphological, biochemical and otolith-based proxies for nutritional condition in sprat larvae collected in discrete 5 m depth intervals from the surface to the bottom in the central Bornholm Basin. Similar to earlier studies, larval sprat were most abundant in 2 depth strata (0 to 10 and 65 to 75 m). Their nutritional condition in surface and deep waters was not uniformly expressed by the different indices. For example, sprat larvae from 0 to 10 m could not be distinguished from conspecifics caught at 65 to 75 m by a long-latency condition proxy (otolith-based growth rates). Similarly, a medium-latency proxy (RNA:DNA) did not suggest differences in condition between the depths. However, short-latency proxies (protein:standard length and DNA:dry weight) supported the depth-dependent condition hypothesis. The lack of correspondence and pitfalls associated with the use and interpretation of multiple condition indices (e.g. the influences of temperature and body size) are discussed and recommendations to strengthen these various metrics are provided.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps341217
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The influence of temperature on the development of Baltic Sea sprat (Sprattus sprattus) eggs and yolk sac larvae (2008)
    Springer
    In:  Marine Biology, 154 (2). pp. 295-306.
    Details
    Publication Date: 2018-06-07
    Description: In spring 2004 and 2005 we performed two sets of experiments with Baltic sprat (Sprattus sprattus balticus Schneider) eggs and larvae from the Bornholm Basin simulating ten different temperature scenarios. The goal of the present study was to analyse and parameterise temperature effects on the duration of developmental stages, on the timing of important ontogenetic transitions, growth during the yolk sac phase as well as on the survival success of eggs and early larval stages. Egg development and hatching showed exponential temperature dependence. No hatching was observed above 14.7°C and hatching success was significantly reduced below 3.4°C. Time to eye pigmentation, as a proxy for mouth gape opening, decreased with increasing temperatures from 17 days post hatch at 3.4°C to 7 days at 13°C whereas the larval yolk sac phase was shortened from 20 to 10 days at 3.8 and 10°C respectively. Maximum survival duration of non-fed larvae was 25 days at 6.8°C. Comparing the experimental results of Baltic sprat with existing information on sprat from the English Channel and North Sea differences were detected in egg development rate, thermal adaptation and in yolk sac depletion rate (YSDR). Sprat eggs from the English Channel showed significantly faster development and the potential to develop at temperatures higher than 14.7°C. North Sea sprat larvae were found to have a lower YSDR compared to larvae from the Baltic Sea. In light of the predictions for global warming, Baltic sprat stocks could experience improved conditions for egg development and survival
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00227-008-0923-1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Various methods to determine the gonadal development and spawning season of the purplish Washington clam, 〈em〉Saxidomus purpuratus〈/em〉 (Sowerby) (2005)
    Wiley
    In:  Journal of Applied Ichthyology, 21 . pp. 101-106.
    Details
    Publication Date: 2017-07-03
    Description: The monthly variation in reproductive cycle, condition factor (fatness), gonad index (GI), ovarian egg diameter and biochemical composition [RNA, DNA content and their ratio RNA/DNA (R/D)] were compared to determine the spawning season of the purplish Washington clam, Saxidomus purpuratus, collected from the west sea of Taean, Korea. All these factors were correlated to the spawning season from May to October. Monthly variation and concentration of the R/D ratio especially represented indicative information about the processes of gonad development and spawning patterns. The increases in R/D ratio in the ovaries corresponded with increases in ovarian egg diameters and the GI during the spawning season. The peak of R/D and RNA content in females was a good indicator of sexual maturation and the DNA content in males. During winter between November and January, the value of fatness, GI, egg size, RNA and DNA content were lower than in other seasons, indicating depletion of energy reserves and lower metabolic demands because of colder temperatures.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1439-0426.2004.00636.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Ontogenic changes in the allometric scaling of the mass-length relationship in sprat (〈em〉Sprattus sprattus〈/em〉) (2005)
    Wiley-Blackwell
    In:  Journal of Fish Biology, 66 . pp. 882-887.
    Details
    Publication Date: 2017-09-14
    Description: An analysis of mass (M) and standard length (LS) data for larval, juvenile and adult sprat (Sprattus sprattus; Clupeidae) revealed marked changes in the allometric scaling factor (b in inline image). For sprat 〈44 mm LS, b was 5·0, whereas in larger juveniles and adults, b was c. 3·4 indicating a relatively protracted metamorphic period for this species.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.0022-1112.2005.00651.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Effects of egg size, parental origin and feeding conditions on growth of larval and juvenile cod Gadus morhua (2009)
    Wiley-Blackwell
    In:  Journal of Fish Biology, 75 . pp. 516-537.
    Details
    Publication Date: 2017-09-14
    Description: An experimental study was performed to disentangle parental and environmental effects on the growth of Atlantic cod Gadus morhua larvae and juveniles. Eggs were collected during the spawning season from spawning pairs (families) kept separately in specially designed spawning compartments. Newly hatched larvae were released simultaneously into two mesocosms of 2500 and 4400 m3. Larval growth was monitored by sampling over a 10 week period, after which juveniles were transferred to on-growing tanks, where they were tagged and kept for up to 2 years. Maternal origin was determined by individual microsatellite genotyping of the larvae (n = 3949, 24 families) and juveniles (n = 600). The results showed significant positive correlations between egg size and larval size during the whole mesocosm period. Correlations, however, weakened with time and were no longer significant at the first tank-rearing sampling at an age of 9 months. Significant family-specific differences in growth were observed. The coefficient of variation (c.v.) was calculated in order to examine variation in standard length of larvae during the mesocosm period. Inter-family c.v. was on average 69% of intra-family c.v. Differences in zooplankton densities between the two mesocosms were reflected in larval growth, condition factor and c.v. Low food abundance appeared to reduce c.v. and favour growth of larvae that showed relatively slow growth at high food abundance. It is suggested that genetically determined variation in growth potential is maintained by environmental variability.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1095-8649.2009.02301.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Use of biochemical indices for analysis of growth in juvenile two-spotted gobies Gobiusculus flavescens of the Baltic Sea (2009)
    Instituto de Ciencias del Mar - CSIC
    In:  Scientia Marina, 73 (S1). pp. 159-170.
    Details
    Publication Date: 2018-01-22
    Description: Multiple biochemical measurements were evaluated as an indirect measure of juvenile fish growth rate. Juvenile two-spotted gobies, Gobiusculus flavescens (Fabricius), caught in the Kiel Bight, were incubated in a temperature gradient table at 7 different temperatures ranging from 9 to 22.7°C for up to 28 days and sampled weekly. RNA/DNA ratios (RNA/DNA), protein and lipid amounts were measured in whole fish homogenates and compared with calculated weight-based growth rates of the individuals. RNA/DNA values were not significantly correlated with weight-specific growth rates. Lipid- and protein-based growth rates, on the other hand, were highly correlated with weight-specific growth (R2 of 0.4-0.5) and lipid-based growth rate explained 45.8% variability of weight-based growth in a linear growth model. Weight-based growth rates showed a dome-shaped relationship to temperature with a maximum around 16°C, a trend mirrored in lipid-based growth rates. The results indicate a stage-dependent shift in energy storage and metabolism with a decoupling of RNA/DNA as an index of weight-based growth rate as the juvenile gobies mature and lipids become the main determinant of weight-based growth in these fish.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3989/scimar.2009.73s1159
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    An individual based model for the direct conversion of otolith into somatic growth rates (2007)
    Wiley
    In:  Fisheries Oceanography, 16 (3). pp. 207-215.
    Details
    Publication Date: 2019-02-27
    Description: Otolith increment width and larval fish data (length and weight) were used to develop an individual-based model (IBM) to describe daily resolved growth rates of North Sea herring (Clupea harengus) larvae (Autumn Spawners) caught during International Herring Larvae Surveys in the ICES area IVa from 1990 to 1998. The model combines sagittal otolith readings (core and individual increment measurements), larval standard length and weight data, and solves an over-determined set of linear system equations for all parameters using the method of least square residuals. The model consists of a matrix, which describes the increment width formation of 119 larvae, a vector containing their length/weight measurements, and a vector describing residuals. The solution vector yields age-dependent maximum somatic growth rates of herring larvae up to an age of 41 days with sizes ranging from 10 to 25 mm. The observed environmental temperature in which larvae dwelled was relatively uniform. Therefore, measured increment width was individually used to determine daily growth from any single larva in relation to their potential maximum growth under optimal feeding conditions. The results are discussed with respect to the spatial and temporal variability of larval occurrence. Finally, an analysis of error estimation of the larval growth characteristics is presented.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1365-2419.2007.00425.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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