How to tell if a goldfish is pregnant<br>Find out if your fish is female. The best way to find out the sex of your goldfish is to ask when you buy the fish, or to consult a vet. That said, females goldfish typically have plump bodies.
All male goldfish have slender bodies.
It is obviously incorrect as overfeeding fish (even males) will result in them being plump.  The AI probably understands the context to mean that only pregnant females can be plump.
( z1 have :ARG0 ( z2 goldfish :mod ( z3 male ) :mod ( z4 all ) ) :ARG1 ( z5 body :mod ( z6 slender ) ) )