The grass puffer is short and round like a barrel and has distinct body colors. Their back is black-green and the abdomen is gray-white with white spots scattered across the body. These fish are carnivores. After high tides, they come in groups in the low tidal zone and wait in shallow water to prey on shellfish, crustaceans, aquatic insects, or small fish. Their hunting tactic is to hide and remain still, then rush out when prey approaches. When faced with danger, the grass puffer escapes by enlarging its body and playing dead.
The grass puffer appears in sandy beaches with low-water lines at Gaomei Wetlands.
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