From April and May to the end of July, oysters are said to be sick; but by the end of August they become healthy, having recovered from the effects of spawning. When they are not in season, the males have a black, and the females a milky substance in the gill. From some lines of Oppian, it would appear that the ancients were ignorant that the oyster is generally found adhering to rocks. The starfish is one of the most deadly enemies of these bivalves. The poet says:--
The prickly star creeps on with full deceit
To force the oyster from his close retreat.
When gaping lids their widen'd void display,
The watchful star thrusts in a pointed ray,
Of all its treasures spoils the rifled case,
And empty shells the sandy hillock grace.
The prickly star creeps on with full deceit
To force the oyster from his close retreat.
When gaping lids their widen'd void display,
The watchful star thrusts in a pointed ray,
Of all its treasures spoils the rifled case,
And empty shells the sandy hillock grace.
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