CLEAN : Salmon hitch a ride to the ocean because of California drought

The video discusses the transportation of fish to the Pacific Ocean to ensure their survival. Due to environmental challenges like low and warm water, the fish are transported 200 miles to Rio Vista, CA. This is not the usual procedure for the 12 million fish released annually, but it is necessary under current conditions to benefit the ocean fishery.

What is unusual about the operating procedures for the fish release this year?

What is the purpose of releasing the fish into the ocean?