Chemical composition and caloric content of egg and zoea of the hermit crabeupagurus bernhardus

Chemische Zusammensetzung und Kaloriengehalt von Ei und Zoea des EinsiedlerkrebsesEupagurus bernhardus

Kurzfassung

Im Laufe der vollständigen Eientwicklung findet eine Zunahme von Wasser um 31,5%, Asche um 5,7%, Eiweiß um 8,8% und Nicht-Eiweiß-Stickstoff um 0,2% statt. In der gleichen Zeit sinkt der Fettgehalt von 29,5% auf 14,8% und der Energiegehalt von 6292 auf 5282 cal/g organischer Substanz. Der Kumulativ-Nutzeffekt der Entwicklung von einem Ei zur Zoea-Larve beträgt 70,0%, 55,3%, 79,4% bzw. 35,0% bezogen auf Trockengewicht, Kaloriengehalt, Eiweiß bzw. Fett. Von den 0,0722 cal, die sich auf den Stoffwechsel der gesamten Entwicklung eines Eies beziehen, werden nur 28,4% aus Eiweiß gewonnen; 66,6% werden durch Oxydation von Fett beigetragen.

Summary

1. Chemical composition and caloric content of egg and zoea of the hermit crabEupagurus bernhardus have been determined and the cumulative efficiencies of yolk utilization calculated.

2. The cumulative efficiencies of yolk utilization for different constituents were 70.0%, 55.3%, 79.4% or 35.0% for dry weight, caloric content, protein or fat.

3. Since the efficiencies with which the different constituents of yolk utilized vary, the chemical composition of the developing eggs undergoes considerable changes. While fat and caloric content showed remarkable decreases, water, ash and protein contents of the eggs increased.

4. Of 0.0722 cal expended on metabolic processes of the embryo, only 28.4% was drawn from the oxidation of protein, while fat contributed as much as 66.6%.

5. Considerable quantities of inorganic salts (0.77µg/egg) are absorbed from the sea-water by the developing egg.

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Pandian, T.J., Schumann, KH. Chemical composition and caloric content of egg and zoea of the hermit crabeupagurus bernhardus . Helgolander Wiss. Meeresunters 16, 225–230 (1967). https://doi.org/10.1007/BF01611706

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Keywords

  • Hermit Crab
  • Caloric Content
  • Main Energy Source
  • Crangon Crangon
  • Mental Mother