Fish which excretes nitrogenous waste in the form of urea are called:

Correct option is C

Correct Answer: (c) Ureotelic
Explanation:
→ Ureotelic fishes excrete nitrogenous waste primarily as urea.
→ This occurs in elasmobranchs (sharks, rays) and some air-breathing fishes.
→ Helps maintain osmotic balance in marine environments.
Information Booster:
→ High urea concentration retained in blood for osmotic stability.
→ Requires energy for conversion of ammonia into urea (ornithine cycle).
→ Advantageous in environments where ammonia excretion is not feasible.
Additional Information (Other Options):
(a) Ammonotelic – most teleosts.
(b) Uricotelic – birds & reptiles.