Alex Mustard / A male Yellow-headed jawfish (Opistognathus aurifrons) blowing out a clutch of eggs he has been incubating in his mouth in order to oxygenate them, East End, Grand Cayman, Cayman Islands, British West...

Alex Mustard / Banded jawfish (Opistognathus macrognathus) male incubating eggs in mouth, which are at a late stage of development and will soon be ready for release. West Palm Beach, Gulf Stream, West Atlantic Ocea...

Doug Perrine / Ring-eye jawfish male expels larvae after brooding eggs in mouth for a week {Opistognathus sp} Borneo (Non-ex).

Fred Bavendam / Spotfin Jawfish (Opistognathus sp) male protectively incubating a clutch of eggs in his mouth, Manado, North Sulawesi, Indonesia

Georgette Douwma / Gold specs jawfish male incubating eggs in mouth, unable to feed {Opistognathus sp} Sangalakki, Indonesia

MYN / Paul Marcellini / Spotfin jawfish (Opistognathus robinsi) Biscayne national Park, Florida, USA, January. meetyourneighbours.net project

MYN / Paul Marcellini / Spotfin jawfish (Opistognathus robinsi) Biscayne national Park, Florida, USA, January. meetyourneighbours.net project

Fred Bavendam / Spotfin Jawfish (Opistognathus sp) male protectively incubating clutch of eggs in its mouth, Manado, Indonesia

Fred Bavendam / Spotfin Jawfish (Opistognathus sp) peeking out of burrow, Manado, Sulawesi, Indonesia

Fred Bavendam / Spotfin Jawfish (Opistognathus sp) male protectively incubating a clutch of eggs in his mouth, Manado, Sulawesi, Indonesia

Constantinos Petrinos / Jawfish {Opistognathus sp} in burrow, Sulawesi, Indonesia

Constantinos Petrinos / Jawfish emerging from burrow {Opistognathus sp} Sulawesi, Indonesia

GEORGETTE DOUWMA / Jawfish {Opistognathus sp} male with eyed brood of eggs in mouth, Borneo

GEORGETTE DOUWMA / Jawfish {Opistognathus sp} carrying brood of eggs in mouth, Indonesia

Angelo Giampiccolo / Yellowhead (Opistognathus aurifrons) hovering above its hole in the sand. Belize Cayes, Caribbean.