The grass puffer (Takifugu niphobles), or Kusa-fugu (Japanese: 草河豚), is a species of fish in the pufferfish family (Tetraodontidae).

This common to abundant species is found in the northwest Pacific Ocean in China (including Hong Kong and Taiwan), Japan, Korea, the Philippines and Vietnam.

[2] The grass puffer has a highly unusual breeding behavior where large groups gather seasonally in shallow water along certain beaches during high tide, throw themselves onto land (with the help of an incoming wave) where fertilization occurs, and then return to the water.

[3][4] The fertilized eggs may be swept back to the sea or stay on land under rocks for a period,[1] but in the latter case they only hatch when submerged by water during a later high tide.

[6] The grass puffer is often caught off beaches, docks, and piers using various baits such as worms, shrimp, sea lice, or cut fish.