Tiger Grouper

The tiger grouper (Mycteroperca tigris) is a member of the family Serranidae found throughout the tropical western Atlantic, including Bermuda, Florida, the Bahamas, and the Caribbean south to Brazil. It is one of the more slender-bodied groupers in its genus, an adaptation associated with more active swimming over open reef compared to the ambush style of bulkier Epinephelus groupers. Its common name comes from the bold diagonal dark bars crossing its upper body, reminiscent of tiger stripes. Like other groupers, it is a protogynous hermaphrodite. Tiger grouper are regularly encountered on Caribbean coral reefs and are an ecologically important mid-to-upper level reef predator.

Tiger grouper are recognized by their bold striped pattern.

• Color: pale grey to reddish-brown background crossed by bold, diagonal dark brown bars on the upper body and head.
• Lower body: often marked with pale, scattered spots below the bars.
• Body: elongated and moderately slender compared to bulkier grouper species.
• Tail: slightly concave to truncate margin.
• Size: typically 40-70 cm. Distinguished from the similarly patterned yellowfin grouper by the absence of yellow pectoral fin coloration and by more strongly diagonal, tiger-like barring across the back.

Tiger grouper are found throughout the tropical western Atlantic, from Bermuda and Florida through the Bahamas and Caribbean to Brazil. They inhabit coral reefs and rocky hard-bottom habitat, typically at depths from about 3-30 m, favoring reef edges, drop-offs, and areas with good coral cover. The species prefers clear, warm tropical water and is most frequently encountered on well-developed reef systems rather than open sand or mud bottom.

Tiger grouper are solitary, moderately active predators that patrol reef edges and drop-offs, hunting smaller fish and crustaceans with quick pursuit rather than remaining stationary for long periods. They are diurnal and often observed hovering near reef structure during the day. As protogynous hermaphrodites, individuals mature as females before some transition to males later in life, and the species is believed to form spawning aggregations at specific reef sites. Tiger grouper occupy a mid-to-upper trophic position on Caribbean reefs, helping regulate populations of smaller reef fish, and their bold striping may aid in camouflage against dappled light on the reef.