blackfish means: This delicately-flavored Pacific Ocean fish is a popular choice for Chinese cuisine. Also known as “Black Trout”, and “Chinese Steelhead”. “. (in Cooking Dictionary)

What else does blackfish mean?

You can choose from any of the many dark-colored fishes such as. (in Merlin Dictionary)

Small freshwater edible fish (Dallia pectoralis) It is found in streams and ponds throughout Alaska and Siberia, and it’s well-known for its resistance to freezing. (in Merlin Dictionary)

One of the many dark-colored, toothed whales (especially the pilot whale) (in Merlin Dictionary)