In looks or behaviour outside of breeding season, no. During breeding season the female may get a bit fatter with eggs, and the male will get breeding stars on it's gill plates and sometimes along the pectoral fins.
Female goldfish are usually bigger than male goldfish.
A lot like female goldfish, actually. Seriously, I don't believe there are any visual differences in basic goldfish genders.
There are several physiological differences between male and female urethras. One of the major differences is that a males urethra is longer than that of a female.
What is the difference between a female and male Kinkajou
Some goldfish are male, while others are female.
The female chirps and the male croaks
Penises.
There is very little sexual dimorphism between male and female goldfish. Male goldfish are generally more slender, because they lack ovaries. Female goldfish may have swollen abdomens. Unless you are a professional, it is not advised to breed goldfish at home, because they cannot lay their eggs due to selective breeding. The eggs must be squeezed out of the female, when they are ready.
The difference between a male goldfish and a female is that the female is usually bigger and in spring and the male gains a white pimple type substance on it's gill flap also the female is more of a gold color and the the male is a silver color.
Male is a guy. Female is a chick. Male has a dick, female doesn't
Well yes you need a male goldfish and a female goldfish to have babies but it takes allot of time to breed them.
The only obvious differences between male and female crocodilians are their size differences :)