The black swallower (Chiasmodon niger) is a deep sea fish that has the ability to extend its stomach 3 times its size so that it can swallow fish that are bigger than itself. It can be found in deep seas up to 1,500 meters or in hot tropical waters. It creates its own light because of the darkness found in some parts of the Pelagic zone. The black swallower can grow up to 25 centimeters.

Chimaeras are related to both sharks and rays. They are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone. Chimaeras grow up to two meters long, are found in the ocean floors and have a venomous spine which they use for defense purposes.

The Atlantic Wolffish is a large bottom-dwelling predatory marine fish. The species is widely distributed across the North Atlantic.