For example, tunas switched from a buccal-opercular pump system to ram ventilation, which allows them to drive large quantities of water over their gills.
Cleaning or replacing the timber floor can make these used containers habitable, with proper attention to such essential issues as ventilation and insulation.
The window and door openings, so important for efficient natural ventilation, are now closed with wood-framed glass windows and a solid wooden front door.
