Lesson 12: Anesthesia and Analgesia

Question 1

To administer general anesthetics, what type of way(s) do you do it?

Answer 1

Immersion or injection, either intracoelomic (ICe) or intramuscular (IM)

Question 2

What anesthetic method of choice for fish?

Answer 2

Immersion

Question 3

When anesthetizing fish by immersion, the following are good practices:

Answer 3

Food should be withheld for 24-48 hours before anesthesia to reduce the risk of vomiting, which impairs gill function.
Use water from the home tank as the source of water for the anesthetic tank.
Check the water quality parameters after adding the anesthetic, especially pH.
Fish should be recovered in water from their home tank in a darkened and quiet area.
Fish should be closely monitored until they are alert and responsive.

Question 4

If fish need to be anaesthetized for longer than a few minutes, what should the delivery of an anesthetic be?

Answer 4

Continuous via water to the gills

Question 5

Gauges required for fish depends on the size:

Answer 5

A 25–28 gauge needle should be used for small fish, while an 18–23 gauge needle is appropriate for larger fish

Question 6

do all fish have nociception?

Answer 6

Yes