Try to save a fish or two. In your mind, lets say the rest die. Then they order more because they have sales from the fish.
No one buys any of the fish, which means no sales, which means no more Walmart ordering.
There have been plenty of threads like this over the years... None do anything big. Just a bunch of people who think saving a single fish will change something.
Oh, hey, lets read the wonderful stickies our site has (that no one acknowledges):