Scott,

I think it's entirely possible they were still spawning. As we all know not all fish of the same species spawn entirely at once. If they'd probably go extinct just like 99 percent of the others species on this planet have.

Now if there was a female that was still fecund vs. just a male on a bed may be another question.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.