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Here is another take;
The bass have at least two major traits which are correlated which are, eating and reproducing. Female bass produce 100,000 to 1 million eggs before spawning. The females must know "prior" to their first egg being produced that they need to get to the spawning rivers. Eggs just don't show up in large quantities like at the grocery store. It takes x amount of time to produce and carry those many eggs.. Since males like to chase tail, those males follow the females. This could de the reason why the smaller males are the last to migrate.
Posted from my iPhone/Mobile device
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