The gills of two species of haemoglobin-free fishes compared to those of other teleosts— with a note on severe anaemia in an eel

摘要: Abstract 1. The gills of two species congenitally haemoglobin-free fishes CHaenocephalus aceratus and Champsocephalus esox (icefishes) twelve normal have been investigated by anatomical histological techniques. 2. Active were found to a large gill area composed number lamellae with very thin epithelium separating blood from water. More sluggish had smaller area, more coarse structure longer diffusion distance. 3. C. unusually few thick long distance between dimensions similar those fishes. was normal, that relatively when compared size. 4. We thus no parameter in the which parallels lack hemoglobin. suppose if these oxygen uptake comparable fishes, they must an increased circulation lamellae.