In terms of osmoregulation, freshwater fish must drink a lot of water and excrete excess salts must have dilute urine and consume salt in their diet have no osmosregulation issues maintain high levels of urea are isoosmotic with their environment

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the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.