Physoclisti are, collectively, fishes that lack a connection between thegas bladder and thealimentary canal, with the bladder serving only as abuoyancy organ.

Addition and removal of the gases from the gas bladder in such physoclistous fishes occurs through specialised structures called thegas gland and ovale respectively. The pneumatic duct that connects the gut and gas bladder is present in the embryos of these fish but it is lost during development. This anatomical state (the physoclistous condition) is believed to be evolutionarily derived from the ancestralphysostomous state.

Some fishes, such aseels, are anatomically physostomous, but their gas bladders function similar to those of physoclists.

• Physostome

• Fish Physiology Volume 4, 1970, Pages 413-443 The Nervous System, Circulation, and Respiration: The Swim Bladder as a Hydrostatic Organ, Johan B. Steen

• Davidson biology department

• Fish anatomy