There are many species of fish for which sex cannot be determined by any external signs. If by bumblebee fish you mean the bumblebee goby, then you simply can't tell. Adult males will be smaller than adult females, but its not a reliable way to tell the difference.
If you are reffering to a bumblebee cichlid, then the males have 2-4 egg spots on the anal fin, where females will only have 1-2. Males have blue markings and females have yellow markings.
Feeder fish, How do you tell male from female of the?
You can tell a male angel fish from a female one by all the colorful stripes it has. [the male one]
their bellies
By performing an experiment
The male is larger and has much larger fins and much showier, brighter colours than the female who is quite a drab little fish.
you can tell if one of the female fish has a puffy stomach a female has a big shape of a V and a male has a smaller one.
While the fish is swimming, look at the fin on the top of their body. If it's tall then it's male if it is short , it's a female.
The male of the species has brighter colours and is a much larger fish than the female
if it is beautiful it is female.if it is handsome or ugly it is male
in male fighter fish there is very deep colour and in female there is very fead colour female have a egg sack but males dont have
bass clef its obvious
youre axolotile is a male it will have lumps on the side of it at the back