basking shark 
noun
A large shark which feeds exclusively on plankton and typically swims slowly close to the surface, found chiefly in the open ocean.
- Cetorhinus maximus, the only member of the family Cetorhinidae.
- No plankton means no basking sharks or manta rays but it also means exceedingly good visibility.
- Finally, I am concerned that the bill proposes to issue quota for species that are so endangered that they are subject to the convention on endangered species, such as basking shark, whale shark, and sea horse.