Experiments on the physiology of southern and northern krill, Euphausia superba and Meganyctiphanes norvegica, with emphasis on moult and growth – a review

@article{Buchholz2003ExperimentsOT,
  title={Experiments on the physiology of southern and northern krill, Euphausia superba and Meganyctiphanes norvegica, with emphasis on moult and growth – a review},
  author={Friedrich Buchholz},
  journal={Marine and Freshwater Behaviour and Physiology},
  year={2003},
  volume={36},
  pages={229 - 247}
}
  • F. Buchholz
  • Published 1 December 2003
  • Biology
  • Marine and Freshwater Behaviour and Physiology
Physiological data are needed for life history studies on krill, and as parameters for input into energy budgets and models. In conjunction with moult and growth data, these may also prove useful for assessing the fishable biomass of krill. Here, the development of physiological concepts in experimental krill research is briefly evaluated, with emphasis on the gaps to be filled. Krill growth is very flexible, as well as strongly temperature and nutrition dependent. The polar Antarctic krill… 
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Advances in our understanding of the physiology and metabolism of Northern krill, Meganyctiphanes norvegica have been sporadic but significant. Despite problems with keeping M. norvegica in good
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Moult cycle and growth of Antarctic krill Euphausia superba in the laboratory
TLDR
Knll was very sensitive to experimental variation in feeding regime and the apparent plasticity of growth parameters indicates that it is able to adapt to strong reglonal and seasonal changes in feeding conditions, typical for Antarctic waters.
Growth and longevity of krill during the first decade of pelagic whaling
TLDR
Estimates of krill growth through the year are obtained which consistently indicate high growth rates, modulated by a strong seasonal pattern, consistent with the studies of age structure using pigment analysis.
Towards an energy budget for krill: The physiology and biochemistry of Euphausia superba Dana
TLDR
It is concluded that the relationship between basal oxygen consumption and wet weight can be described by the relationship QO2=0.0813 W0.88, that filtration rates in krill are high (but possibly reduced in dense swarms), and growth of adult krill in summer is about 2 mm per week.
Behavioral and Physiological Characteristics of the Antarctic Krill, Euphausia superba
TLDR
The three-fold reduction in metabolic rate is the most important winter-over mechanism for these adults, although lipid utilization and shrinkage also help satisfy energy requirements in the winter.
Moult in relation to some aspects of reproduction and growth in swarms of Antarctic krill,Euphausia superba
TLDR
While all immature krill moulted at approximately the saine rate in the study, there were significant differences in the moulting rates of mature male and female krill, likely related to the energy expenditure required for ovary development in females and spermatophore production and searching behaviour in males.
On the food of northern krill Meganyctiphanes norvegica in relation to its vertical distribution
TLDR
It is proposed that krill in the Clyde Sea area and the Kattegat show a diel rhythm in feeding activity that is believed to be an adaptive response to minimising predation risk.
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TLDR
Reproductive strategy was studied in two euphausiid species, E. superba and Meganyctiphanes norvegica, living in extreme climatic conditions and experiencing moderate seasonal variations and a stable temperature regime.
Body shrinkage as a possible over-wintering mechanism of the Antarctic krill, Euphausia superba Dana
TLDR
It is suggested that body shrinkage could be an alternative way for this animal to conserve energy during the winter and be discussed in the light of the characteristics of body structure and life style of E. superba.
Growth, metabolism and growth efficiency of a euphausiid crustacean Euphausia pacifica in the southern Japan Sea, as influenced by temperature
TLDR
The biological and ecological significance of the optimum temperature which leads to the maximum K2, which was derived from calculation of cumulative carbon invested in growth and metabolism in this animal, is studied.
Studies on metabolic properties in the Northern Krill, Meganyctiphanes norvegica (Crustacea, euphausiacea): influence of nutrition and season on pyruvate kinase.
TLDR
Neither the feeding experiments nor the animals captured in the field during low and high productive seasons indicate that PK properties of M. norvegica are modified in relation to food supply, suggesting alternative mechanisms are involved in the depression of the metabolic rate in terms of oxygen consumption.
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