maybe i am mis-reading this thread,but i think there is a reason for sea robins to be in the eco system.i see too many people wanting to eliminate certain species because they have no food value,they stel bait,they are this that or the other thing.i have no idea why they are in the eco system but i am sure nature and evolution has a reason why they are.
one other thing,if someone is trying to buy fish you want to keep i think saying NO and then ignoring them will get the message across.
just my opinion.