Blue whale catfish

The term "Blue whale catfish" doesn't identify a specific, recognized species in the aquarium hobby or scientific community as of my last update in April 2023. It's possible that this name might be an informal or common name that has been used for a particular species of catfish, but without a more specific scientific name or widely recognized common name, it's challenging to provide accurate information including color, origin, appearance, or its popularity in the aquarium hobby. Catfish as a group are diverse, with some species featuring blue colorations and varying significantly in size, shape, and habitat preferences. They are found in freshwater environments all around the world, and while some catfish species are prevalent in the aquarium trade, others are rare or not kept in home aquariums at all. To provide accurate details, further clarification on the specific species referred to as "Blue whale catfish" would be necessary.