When does a ray drop it's sting?

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Anywhere from 5 months to .. who knows, maybe as much as a year. It seems to be at least partly related to how quickly the ray is growing. Usually the old stinger will turn white around the base a few days to a few weeks before it's dropped.
 
5-6 months depend on the feeding amount you will see the old barb began to rise for the tail for the new barb to grow in.
 
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