Gobiidae

Blotch-tailed pygmygoby

Trimma caudomaculatum

Performs bidirectional sex change to balance group

• Tropical
• Transcontinental
• Marine fish
• Indian Ocean
• Pacific Ocean
• East Asia
• Oceania
• Southeast Asia
• Elongated
• Small
• Tropical fish

Trimma caudomaculatum, the blotch-tailed pygmygoby , is a species of goby from the Western Pacific. Like other members of the genus, they are usually found in large schools in the sloping or vertical drop-offs at coral reef edges. Similar to other species of Trimma, this species consists of multiple cases of bidirectional sex change, meaning that if a group is lacking in a specific sex a partial amount of the group can change their undeveloped gonad structure of the opposite sex in order to accommodate.