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A Mg++ dependent cortical reaction in the eggs of penaeid shrimp

1977; Wiley; Volume: 200; Issue: 1 Linguagem: Inglês

10.1002/jez.1402000122

1097-010X

Wallis H. Clark, John W. Lynn,

Reproductive biology and impacts on aquatic species

Abstract Mature 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.