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The resumption of meiotic maturation of the oocyte of the prawn Palaemon serratus is regulated by an increase in extracellular Mg 2+ during spawning

Developmental Biology, ISSN: 0012-1606, Vol: 118, Issue: 2, Page: 361-370
1986
  • 25
    Citations
  • 0
    Usage
  • 2
    Captures
  • 0
    Mentions
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Metrics Details

  • Citations
    25
    • Citation Indexes
      25
  • Captures
    2

Article Description

The resumption of meiotic maturation in the oocyte of the prawn Palaemon serratus was triggered by exposure to either natural or artificial seawater. The stages of meiotic maturation were observed in whole mounted oocytes. Resumption of meiosis depended on the presence of external Mg 2+ but not on external Ca 2+. The kinetics of the completion of meiotic maturation stimulated by artificial seawater with or without Ca 2+ were identical. The threshold concentration of external Mg 2+ required for the resumption of meiosis was ⩾ 15 m M. This result is of physiological interest, since this Mg 2+ concentration was higher than the Mg 2+ concentration in blood from ripe female prawns (10 m M ). Therefore, Mg 2+ might be a natural factor controlling meiotic maturation in the prawn oocyte. Addition of ionophore A 23187 to artificial seawater also induced meiotic maturation; the stimulation by A 23187 required external Ca 2+ but not external Mg 2+.

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