To accurately sex a walleye (without opening it up) is not easy for most people outside of the spring spawning season. In the spring you can see the "slit" on a female versus the "round doughnut" on the male (not sure if this is a great description).
I'm thinking it's because this time of year they more actively using their reproductive organs and they are "swollen" so it's easier to do this time of year with significantly better accuracy and reliability.
In late summer, fall and winter, I have to say it can be pretty tough, and even a trained biologist can make some errors in sexing a fish visually.
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