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Metabolism and growth in scyphomedusae

Helgoländer Wissenschaftliche Meeresuntersuchungen, ISSN: 0017-9957, Vol: 18, Issue: 4, Page: 367-383
1968
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Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    12

Article Description

Measurements on the rate of growth of Rhizostoma octopus conducted by Thiel (1966) yielded an unusual shape of the graphically plotted growth curve. The close relation between rates of growth and metabolism suggested, as a first step, the investigation of the oxygen consumption of this jelly-fish especially as a function of body weight. In accordance with the high rate of growth, oxygen consumption related to wet weight does not decrease during growth and shows weight proportionality. The same seems to be true for specimens of the related Cyanea and Chrysaora species. The rate of oxygen consumption of Scyphomedusae is rather high. Related to the organic matter the oxygen consumption in Rhizostoma amounts to 2077 mm/g/h at 15° C. This value is much higher than in other invertebrates. The unusual growth curve of Rhizostoma octopus affords a revision of the growth types established by von Bertalanffy (1942). His third growth type cannot be distinguished exactly from the first type and hence must be united with it. The observations on Rhizostoma seem to indicate the existence of another third type, where the rate of growth increases with increasing body size. © 1968 Biologischen Anstalt Helgoland.

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