Morphology and anatomy of the olfactory organs of the marine fish Thynnus thunnina (Cuv. et Val.)

The authors studied the morphology and anatomy of the olfactory organs of the marine fish Thynnus thunnina. The fish has a single nasal orifice. The round olfactory rosette has a central axis surrounded by radially oriented lamellae. The olfactory rosette (olfactory organ) is provided with two accessory nasal sacs - a lacrimal and an ethmoidal sac. Thynnus thunnina was classified in Teichmann's (1954) group II, i.e., the "eye-fishes", whose vision is better developed than their olfaction.