Aquatic respiration
Videos
Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metab
Sea slugs respire through a gill (or ctenidium)
Posterior view of the gills of a tuna
Aerial view of Slapton Sands and northern part of Ley geograph.org.uk 1434412
Maldivesfish 2
Spiracle (vertebrates)
Videos
Spiracles are openings on the surface of some animals, which usually lead to respiratory systems.
Spiracle of a bluespotted ribbontail ray, Taeniura lymma
Spiracle of a shark (bighead spurdog, Squalus bucephalus)