I am going to test my sexing method with a fillet knife in the coming weeks before my RES start to spawn. I will need to do this quickly as water temps have jumped into the lower 60's in the last week. Will the presence of eggs or the lack of be sufficient for determining male or female fish? Anything else I should or could look for? Any thoughts on minimum size to test? I am thinking 7" just to be safe but most RES should be sexually mature at 5-1/2". How many "samples" would folks like to see?
