From the Ichthypundit

Bubba, last known Alabama sturgeon, dies in captivity

Rest in peace, Bubba. The fishery people hope there are more still in the Alabama River:

They still hope to find and catch more of the endangered fish to use them and some of Bubba's frozen sperm to start a breeding program, he said.

Anyway, the Alabama sturgeon apparently became endangered because its breeding was disrupted by dam building. And it took over a decade to get on the endangered list, by which time there were only a handful left. Fewer than ten have been caught in the past seven years.