Do Osteichthyes fishes have any cartilage? Higher vertebrates, such as mammals, birds, reptiles and amphibians have both bone and cartilage. But do Osteichthyes fish (Bony fish) have any cartilage? Or do they only have bones? I've searched the web but I could not find anything helpful.

Yes, Osteichthyes do have cartilage. For example, Ancient origin of lubricated joints in bony vertebrates shows images of cartilaginous tissue in the joints of several bony fish. More generally, cartilage is required for normal bone development, and Osteichthyes are no exception (e.g. Distinct patterns of notochord mineralization in zebrafish coincide with the localization of Osteocalcin isoform 1 during early vertebral centra formation).