A METHOD AND A FISH FARMING PEN FOR REARING FISH WITH A PHYSOSTOME SWIM BLADDER

摘要

A fish farming pen for rearing fish 1 with a physostome swim bladder includes fish pen walls 14 forming a confined submersible fish residence volume 12 adapted to allow the submersible fish residence area to be submerged below a sea surface 15. The fish 1 is prevented from accessing the sea surface 15. An air releasing bubble generating element 9 is located in or below the confined submersible fish residence volume 12. Furthermore, the invention relates to a method of rearing fish 1 with a physostome swim bladder in a submerged fish pen 6 without access to a natural sea surface. The method includes generating air bubbles at a lower part of the submerged fish pen 6, whereby the fish 1 with a physostome swim bladder is enabled to replenish air to their swim bladder from said air bubbles 5.