Ion and Osmoregulation in Marine Fish Flashcards
1
Q
What are the 4 main challenges SW fish deal with?
A
- diffusional salt influx across body surface
- osmotic water loss
- salt influx during feeding
- entry of toxic divalents
2
Q
What becomes toxic if not regulated?
A
- divalents (Mg, SO, Ca)
3
Q
How do marine fish compensate for challenges?(3)
A
- drink SW but additional NaCl lost
- excess salt secreted by gill ionocytes
- kidney minimizes volume of urine
