It depends on the species. some of the largest species- such as the Blue Whale, feed on microscopic or near-microscopic Krill or plankton. On the other hand the Sperm whale feeds on Giant Squid. Squid and fish are staple whale food in aquariums with captive cetacea.
Not for humans
because that's where there food source is
it is their main food source
true
an important source of food for whales and fish
krill is a food source for whales
Hunting and killing whales for food is a tradition among many cultures, whales for some are just a food source the same way many cultures and societies eat chicken pork beef etc. It also was something Inuits did for food and oil because whales were convenient.
Nothing justifies hunting except as a food source.
They are whales major food source, without them they would die
krill are shrimp like crusteaceans that feed on plankton and algae and are a great food source to whales
whales suck in their food
By hunting for it.