Disection of a fish head COPY

Question 1

Steps

Answer 1

put on rubber gloves

rinse fish head under cold water to remove mucus

open the mouth and note the teeth on both jaws and the tongue

which has taste buds
at the bottom of the mouth the low jaw moves up and down to take in water and pray the salmon does not chew and there is limited sideways movment of the lower jaw

use forceps to move the operculum in and out

the operculum may be stiff to move but this is expected because it needs to close very firmly for the ventilation mechanism to occur

lift the operculum and identify the gill filaments
use scisors to cut the operculum off
you will see 4 gills

with large scissors cut through the first gill filament and where it attaches to the head at the bottom as with the operculum, cutting through the gill arach may require considerable strength.

cut through the first gill arch where it attaches to the head at the top.

not the gill rakers attached to the gill arch . they filter solids, preventing

Question 2

Why do you rinse the fish head ?

Answer 2

to get rid of the mucus

and older material as they can be unidentifiable

Question 3

why does the salmon not chew its food

Answer 3

as there is not much side movement in their jaw

Question 4

how many gills are there under each operculum

Answer 4

4

Question 5

why is the operculum stiff to move

Answer 5

it needs to be sealed tight so that the ventilation mechanism can be used

Question 6

what are gill slits

Answer 6

the spaces between the gils