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After about 3 years, at the juvenile stage, the females begin to migrate to the ocean where they mature. The males tend to remain in the estuary longer than the females. After 5 to 7 years, females return to spawn for the first time. It takes several years for spawning females to reach full productivity.
[ **** An average 6 year old female produces half a million eggs while a 15 year old can produce three million. ]
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