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Measurements on the rate of growth ofRhizostoma octopus conducted byThiel (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 relatedCyanea andChrysaora species. The rate of oxygen consumption of Scyphomedusae is rather high. Related to the organic matter the oxygen consumption inRhizostoma amounts to 2077 mm3/g/h at 15° C. This value is much higher than in other invertebrates. The unusual growth curve ofRhizostoma octopus affords a revision of the growth types established byvon Bertalanffy (1942). His third growth type cannot be distinguished exactly from the first type and hence must be united with it. The observations onRhizostoma seem to indicate the existence of another third type, where the rate of growth increases with increasing body size.

Stoffwechsel und Wachstum bei Scyphomedusen