I have quite the list for this. Ba dum tiss. So much rhyme ok here we go...
• Bala Shark- They get huge, are incredibly active and need space, need schools, and did I mention they get big? Seriously I do not see how they can survive in any aquarium and most public aquariums should not house them. They deserve more than the 75 & 90 gallon tanks some put them in. If y'all wanna see the true potential of a Bala and the sheer tank size they'd need go to Texas and visit the Fort Worth Zoo Aquarium.
• Chinese High-Fin Shark- again these fish get too big for most aquariums and truly deserve ponds. I just do not see how any aquarium can house these fish.
• Pacu- Ok I'm really sick of seeing these as available and wide spread as they are in my area. The Petco (and walmart) near me always has a ton in stock and it pains me to think that someone went home with a monster for their 20 gallon. These fish are massive beasts that have 0 place in our hobby. There's no way most ponds can house these fish and I refuse to believe that ANY aquarium can house these fish. This is the best example of freshwater fish that need to stop being sold and let them stay in the wild.
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