Ключевые слова: animal welfare, aqua pets, aquatic, aquatic environment, bunch, captivity, close quarters, confined, confinement, conservation, containment, crowded, ecosystem, enclosed, environmental impact, environmental issues, finned creatures, fish, fish behavior, fish tank, group, limited, many, marine animals, marine conservation, marine life, marine pets, marine species, market, non terrestrial, numerous, ocean life, pack, piscine, restricted, schools, sea creatures, shoal, small area, space, swim, swim together, swimming, underwater, underwater world,