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).
... of 18 living with them, 62.2% are married couples living together, 17.0% have a female householder with no husband present, and 15.9% are non-families. 13.0% of all ...