Internal & External Fish Anatomy 

Teacher to add cut and paste/ colour coded flip fish of external & internal anatomy

Using a Dichotomous key

See if you can use the key below to identify the fish.

Classification key for certain fish

1.a. Body covered with scales Go to 2

1.b. Body lacking true scales Go to 8

2.a. Caudal fin concave in shape Go to 5

2.b. Caudal fin rounded Go to 3

3.a. Two separate dorsal fins Go to 4

3.b. Dorsal fins joined Estuary Cod

4.a. Large hinged mouth Barramundi

4.b. Small mouth Trigger Fish

5.a. Head has a pointed beak Garfish

5.b. No beak present Go to 6

6.a. Anal fin covers over one-third of body length Happy Moment 

6.b. Anal fins cover less than one-third of body length                                 Go to 7

7.a. Body has even colouration Bream

7.b. 6-7 coloured vertical bands on body Grass Sweetlip

8.a. Body long and narrow Pipe fish

8.b. Body less than 4 times as long as broad Porcupine fish