Many years ago I was buying some catfish bait in the DC fish Market. One of the mongers had a basket of crappie out with a sign that said "Crappie 2.95 per Pound".
Next day buying more the bait the same basket sat with no change in the amount of crappie sold.
Two days later I come back and the basket has maybe 6 fish in it and a new sign. "Rainbow Perch 3.25 per Pound"

It is all about the marketing..

Capt Mike