Question:
Which one of the following is responsible for regulation of osmotic pressure in sea fish?
Which one of the following is responsible for regulation of osmotic pressure in sea fish?
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TMAO functions as an osmoprotectant in sea fish; bacterial spoilage reduces TMAO to volatile TMA (fishy odor).
Updated On: Sep 15, 2026
- Trimethyl amine oxide
- Dimethyl amine
- Trimethyl amine
- Formaldehyde
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Marine teleosts and elasmobranchs maintain cellular osmoregulation against hypertonic seawater using organic osmolytes.
Step 2: Detailed Explanation:
Trimethylamine oxide (TMAO) is a key natural zwitterionic osmolyte accumulated in high concentrations in the muscle tissues of marine fish.
It regulates osmotic pressure and counteracts the protein-destabilizing effects of high hydrostatic pressure and urea.
Post-mortem bacterial reduction converts odorless TMAO into volatile trimethylamine (TMA), the characteristic fishy odor marker.
Step 3: Final Answer:
Therefore, trimethyl amine oxide (TMAO) is responsible for regulating osmotic pressure in marine fish.
Marine teleosts and elasmobranchs maintain cellular osmoregulation against hypertonic seawater using organic osmolytes.
Step 2: Detailed Explanation:
Trimethylamine oxide (TMAO) is a key natural zwitterionic osmolyte accumulated in high concentrations in the muscle tissues of marine fish.
It regulates osmotic pressure and counteracts the protein-destabilizing effects of high hydrostatic pressure and urea.
Post-mortem bacterial reduction converts odorless TMAO into volatile trimethylamine (TMA), the characteristic fishy odor marker.
Step 3: Final Answer:
Therefore, trimethyl amine oxide (TMAO) is responsible for regulating osmotic pressure in marine fish.
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