There are plenty of things in the fish industry that need a major shake up. Indiscriminate use of chemicals, inbreeding, keeping fish in sewerage ponds.
Guppies and Siamese fighting fish are so inbred it's not funny. The poor fish have no hope when their parents are their brothers, sisters, cousins, aunts, uncles and grand parents. Hell, there are laws to stop people marrying their cousins but people breed parent to child animals all the time.
Then the inbred fish have to deal with all sorts of nasty bugs that are made stronger by all the chemicals and drugs being put into ponds in fish farms around the world. People still dish out ant-biotics to people that don't have confirmed or known bacterial infections, and fish at farms in various countries are still being exposed to things like Trichlorphon, DDT and other cancerous substances that have been outlawed in most countries around the world.
And topping off the whole ordeal is fish being grown in sewerage ponds and fed of worms and daphnia that are grown in sewerage ponds.
So many sick fish and new diseases are coming out of Asian fish farms it isn't funny. I am amazed at how resilient fish are when they have to live with the crap they are put through by various farms around the world. However, even with their resilience, they are still losing the battle, and we see this all the time now with fish that have infections that can't be treated, fish that have new undescribed diseases, and fish that die for apparent reason.