The skeleton, which forms the support structure inside the fish, is either made of cartilage, in cartilaginous fish, or bone in bony fish.
ðə skˈɛlᵻtən, wˌɪtʃ fˈɔːɹmz ðə səpˈoːɹt stɹˈʌktʃɚɹ ɪnsˈaɪd ðə fˈɪʃ, ɪz ˈiːðɚ mˌeɪd ʌv kˈɑːɹɾɪlɪdʒ, ɪn kˌɑːɹɾɪlˈædʒɪnəs fˈɪʃ, ɔːɹ bˈoʊn ɪn bˈoʊni fˈɪʃ.