If 5/8 of fish are yellow. Which could be a smaller fraction of the fish?

Question

I need help with this question, if anyone could answer i’d appreciate it. My exams are coming up and i complete;y forgot how to do this. 

Answer 1

1/8

1/4

3/8

 

 There may be more answers than that.

 It would help if we knew how many fish there are or what other colors there are.

Answer 2

If 5/8 are yellow, the others must add up to

 

1- 5/8 = 8/8 - 5/8 = (8 - 5)/8 = 3/8