Alex Mustard / Convict blennies (Pholidichthys leucotaenia) swim across a coral reef with seafan (Melithaea sp.) behind. Misool, Raja Ampat, West Papua, Indonesia. Misool Marine Protected Area. Ceram Sea. Tropical W...

Georgette Douwma / Convict blenny or False catfish (Pholidichthys leucotaenia). juveniles school in vast numbers over coral reefs. Ambon, Indonesia.

Alex Mustard / Convict blennies (Pholidichthys leucotaenia) shoal above a coral reef, Raja Ampat, West Papua, Ceram Sea, Pacific Ocean.

Alex Mustard / Shoal of Convict blennies (Pholidichthys leucotaenia) forming a tight ball, defensive behaviour, on a coral reef, Raja Ampat, West Papua, Ceram Sea, Pacific Ocean.

David Fleetham / Schooling Convict fish / Convict blennies (Pholidichthys leucotaenia) juveniles, in a tight ball formation, Philippines, Pacific Ocean.

Alex Mustard / Mixed school of diagonal-banded sweetlips (Plectorhinchus lineatus) and ribbon sweetlips (Plectorhinchus polytaenia) gather above plate corals, with convict blennies (Pholidichthys leucotaenia). Saund...

Alex Mustard / A mixed school of diagonal-banded sweetlips (Plectorhinchus lineatus) and ribbon sweetlips (Plectorhinchus polytaenia) gather above plate corals, with convict blennies (Pholidichthys leucotaenia). Sau...