Ichthyology is the branch of zoology studies fishes. This includes the bony fishes (Osteichthyes), the cartilaginous fishes (Chondrichthyes) such as sharks and rays, and the jawless fishes (Agnatha).
... be more common in females than males. Urethritis is a common cause of dysuria[?] (pain when urinating).
Related to urethritis is so called urethral syndrome[?]
Passage ...