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On a walleye, 1/2 of the gill cover – where the cheek meat is found – is smooth and scale-less. The sauger’s gill cover in the same area is fully scaled.
The two most obvious signs of a true sauger are as follows:
1) Rows of spots on the dorsal fin. The key here is to look for organized “Rows” of spots. True saugers have these rows of spots.
If the fish you caught doesn’t have rows of spots on the dorsal fin, it’s most likely not a sauger. It may be a saugeye, but it’s not a sauger.
2) As stated above, the meaty portion of a saugers cheek is scaled and rough like sand paper.
Saugeyes do not have rows of spots on the dorsal fin. They may have spots but they are in more of a random order and not organized at all.
Walleyes usually have a very distinct white spot on the bottom tip of their tail and the meaty portion of their cheek is smooth and generally free of scales.
I won’t go into coloring as that can be all over the place for all three species and should not be used to identify them.