I think the rule of thumb is a LMB can eat a fish 1/3 its length. That depends on the shape of the fish, so just approximate.
Are you sure the pond is devoid of fish? From your description my guess is there is already fish in the pond. "Creek fed" makes me suspect.
The creek is dry most of the time. I should have worded that differently. We've never had anything in there but catfish and bream.
