Читать книгу Clinical Guide to Fish Medicine - Группа авторов - Страница 40

In cartilaginous fish, buoyancy is attributed to the cartilaginous skeleton, the large, lipid‐dense liver, and urea and methylamine oxides in the blood (Withers et al. 1994; Shuttleworth 2012). No cartilaginous fish have swim (gas) bladders. The sand tiger shark (Carcharias taurus) typically shows a gas shadow in the stomach on imaging as it swallows air for additional buoyancy.