Difference: the mouth of grouper is short and sharp, while that of tiger grouper is wide and big. Grouper has no dorsal fin, while tiger grouper has backstab and spikes.
Pearl spot is a kind of marine fish. The scientific name of pearl grouper is Pearl Gentian grouper, which is a hybrid of Gentian grouper and tiger grouper. Its head is similar to a tiger's spot, but its tail is the tail of gentian, so it looks beautiful.
Pearl spots are mainly distributed in tropical and subtropical waters of the Indian Ocean and the western Pacific Ocean, and usually inhabit coral reefs, rocky seabed and other oceans. Because of the need for a specific habitat, Pearl Spot is an absolute marine fish and can never survive in fresh water.