I can find no literature mentioning any kind of sexual dimorphism in the Brown Bullhead Catfish (Ameiurus nebulosus) so I would assume that the most probable difference would only be visible during breeding when the ovipositors of the fish would be visible. Then it would be easy to distinguish male from female because only the female will produce ova (eggs).
Among young fish, it is impossible, but during the spawn, adult males get darker than females. Also, bluegills are the only sunfish where males are slightly larger than females.
there eyes
Feeder fish, How do you tell male from female of the?
You can tell if someone is male or female by their reproductive parts.
How do you tell a male pacific frog from a female
Both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
You can tell a male angel fish from a female one by all the colorful stripes it has. [the male one]
Because the male has a mane and the female does not have a mane.
When they are fully feathered, the male will have feathers that curl on his tail and the female doesnt. This is how you tell if they are male or female without handling them
When they are fully feathered, the male will have feathers that curl on his tail and the female doesnt. This is how you tell if they are male or female without handling them
A snail is both female and male. They are hermaphrodites.
The male would have an outty and the female an inny
if it has a line in the middle its a female if it doesn't its a male