Just because we can't hear their screams doesn't mean they aren't in pain. A growing mountain of scientific evidence proves that fish feel physical pain and exhibit unique behaviors.

The fish in the video is being mutilated alive and then left to slowly suffocate. Often fish are 'processed' while still alive. https://gfycat.com/unhappyhardgroundhog-fisharefriends-endspeciesism-animalrights

Aquatic Animal Sentience:
https://animalpeopleforum.org/2018/12/12/another-perspective-fish-part-one-aquatic-animal-sentience/

Fish Intelligence, Sentience and Ethics
https://animalstudiesrepository.org/acwp_asie/75/ http://nautil.us/issue/40/learning/fish-can-be-smarter-than-primates

Social learning in fish:
https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1467-2979.2003.00122.x

Fish intelligence:
https://www.mq.edu.au/study/find-a-course/environment/marine-biology/expandable-content/fish-have-culture,-feel-pain-and-show-signs-of-machiavellian-intelligence

https://news.nationalgeographic.com/news/2011/01/110107-fish-count-numbers-humans-animals-science/

Facial recognition in fish:
http://www.ox.ac.uk/news/2016-06-07-fish-can-recognise-human-faces-new-research-shows

https://www.wired.co.uk/article/fish-can-recognise-human-faces

https://www.newscientist.com/article/2134613-fish-recognise-friends-and-foes-through-their-unique-faces/

http://blogs.discovermagazine.com/crux/2015/03/03/fish-smarts/

Emotional states in fish:
https://phys.org/news/2017-10-emotional-states-fish.html https://www.psychologytoday.com/gb/blog/animal-emotions/201406/fish-are-sentient-and-emotional-beings-and-clearly-feel-pain

https://royalsocietypublishing.org/doi/full/10.1098/rspb.2015.2266

https://www.psychologytoday.com/us/blog/brain-waves/201704/even-fish-need-friends

https://io9.gizmodo.com/5859855/fish-enjoy-a-good-massage-as-much-as-humans

Depression in farmed fish:
https://www.upi.com/Science_News/2016/05/25/Study-Farm-raised-salmon-suffer-from-depression/5391464194628/

Play behaviour in fish:
https://www.techtimes.com/articles/18344/20141021/fish-play-for-fun-study.htm

https://www.cell.com/current-biology/pdf/S0960-9822(14)01333-5.pdf

Fish are exploited on a scale that far exceeds any other animal. It is estimated that between 51 and 167 billion farmed fishes were slaughtered for food globally in 2017, and that between 0.79 and 2.3 trillion fish were caught from the wild each year for 2007-2016.
https://freefromharm.org/animal-cruelty-investigation/the-filthy-business-of-fish-farming/

The Save Movement:
https://www.instagram.com/p/BvNZekhl8sH/