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Abstract
AbstractMature penaeid oocytes contain large cortical specializations (rods) in their cortex. These rods reside in membrane crypts and are isolated from the external environment by a thin investment coat which surrounds the oocyte. When oocytes contact seawater, at spawning, their cortical rods are expelled and form a striking investment layer which subsequently dissipates. During cortical rod dissipation a hatching membrane forms around the egg. Oocytes spawned into Mg++ free seawater do not exhibit cortical rod explusion. If oocytes spawned into Mg++ free seawater are returned to normal seawater cortical rod explusion proceeds, however the expelled rods do not dissipate.
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