The Indo-Pacific Sailfish is a large and fast fish that appears in both of the Endless Ocean games.
"This fish has a large, sail-like dorsal fin and a long snout. It suddenly unfurls its giant dorsal fin right in front of its prey, confusing them and leaving them unable to swim normally.
It uses this opportunity to strike the fish with its long snout, and then it eats the weakened prey.
This fish's body is developed to make it swim faster. It has indentations on its dorsal and pelvic fins to decrease water resistance and ridges to stabilise its swimming trajectory. It can reach speeds of over 100km/h and holds the title of world's fastest fish."
A loose group of Indo-Pacific Sailfish is found around the Deep Valley area, swimming in the water above the chasm.
These fish swim about quickly, in large, loose groups. When poked or stroked, they unfurl their dorsal fin in protest.