Conversation so far:
what is the fastest sea animal on earth
A hooked black marlin has been recorded stripping line off a fishing reel at 120 feet per second (82 mph; 132 km/h).
where is the black marlin found
The black marlin (Istiompax indica) is a species of marlin found in tropical and subtropical areas of the Indian and Pacific Oceans.

Question: how big can the fish grow
Self-contained rewrite: how big can the black marlin grow