As of 1994 eight species within Dasyatidae were listed as endangered or vulnerable to extinction, with one other species nearing vulnerable status. Five species of river ray were listed as potentially endangered, but there was insufficient data to make a definite determination. However, sharks and rays in general are vulnerable to overfishing. They grow and mature slowly, and the size of the adult population closely determines the number of young produced, due to their “slow” reproductive strategy of investing a great deal of energy in relatively few young over a lifetime.
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