ichthyologist
ichthyologist:

 Pilot Fish (Naucrates ductor)
Pilot fish can often be seen accompanying sharks, rays and sea turtles. They form a mutualistic relationship with their host, eating ectoparasites and leftovers on ther host, whilst gaining protection from other predators. They are also known to follow ships for long distances.
2013 Peters Unterwasserfotos und meer via Wikimedia commons

ichthyologist:

Pilot Fish (Naucrates ductor)

Pilot fish can often be seen accompanying sharks, rays and sea turtles. They form a mutualistic relationship with their host, eating ectoparasites and leftovers on ther host, whilst gaining protection from other predators. They are also known to follow ships for long distances.

2013 Peters Unterwasserfotos und meer via Wikimedia commons