Читать книгу Clinical Guide to Fish Medicine - Группа авторов - Страница 65

These are large, carnivorous, predominantly freshwater fish. The body and jaws are long with mouths that have needle‐like teeth. They have heavy rhomboid, interlocking ganoid scales. The swim bladder is heavily vascularized for air‐breathing (Figure A1.14) (Nelson et al. 2016). The vertebral centra are opisthocoelous (concave on their caudal surface, convex on the cranial, creating a ball‐and‐socket joint) rather than the amphicoelous centra of most other fish (concave on both surfaces) (Helfman et al. 2009).