How does active transport the atlantic cod maintain homeostasis with regard to the balance of sodium and chlorine ions

The Atlantic cod is fish of Atlantic ocean that continuously drinks water to fulfill its needs, however, this fish is not an ocean osmoconformer. The concentration of the salt is less than the seawater in the fish. It removes water by the process of osmosis which is active transport to the ocean.

The homeostasis is maintained by these fishes by removing excessive salt from the body and as it moves against the gradient that is active transport, this process requires energy. These fishes excrete urine in a very concentrated form.

chordata is the answer