What do the kidneys of a dogfish shark look like?

Dogfish sharks (Squalus acanthias) have kidneys that are elongated and slender, located in the body cavity near the backbone. They are dark to reddish-brown in color and covered by a thin capsule. The kidneys are responsible for regulating water and salt balance, removing waste products from the blood, and producing hormones to maintain homeostasis in the dogfish shark's body.