Stocked circular marine pen with jumping salmon, fishery overcrowding

salmon salmon farming stocked marine pen overcrowding circular aquafarming fish mortality rate seafood fishery jumping aerial atlantic senja norway fish pen aquaculture nutrient runoff management plan ammonia salmo salar stocking density algal blooms fish welfare marine jump round commercial fish health controversial carbon footprint export parasite management water quality antibiotic use disease control marine ecosystem sustainable seafood atlantic salmon salmon farm pisciculture husbandry market demand aquafarm drone cage norwegian ecosystem impact food production