Fisheries directly or indirectly affect the livelihood of over 500 million people all over the world. However, overfishing including the taking of fish beyond sustainable levels is reducing fish stock and employment in
many world regions.

This will continue globally until sufficient species depopulation curbs human behavior to feed mass markets for profits.

Few people realize how efficient these freezer trawlers are at fully processing fish to customer specifications. They process fish into fillets within hours of being caught. Some can process more than 300 tonnes of fish a day and can store more than 6,000 tons of graded and frozen catch.

Operations such as this faciliate species depopulation due to overfishing and encouraging habitat loss. This is the mass market fishing industry which serves 90% of the major grocery retail sector.

If you must eat fish, buy line caught to encourage that fish have been caught using sustainable traditional fishing methods using hook and line. This method has minimal environmental impact and as all fish are
caught live it ensures the fish are in top condition before being stored in ice.

Sources:
youtube.com/watch?v=u5uzbd05NzQ
wikipedia.org/wiki/Factory_ship
preventdisease.com