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One this morning and missed one.

Below is a copy of my post from May 2015 that talks about the science behind blue-tinted walleye...given their close relation, I'd imagine that blue-tinted perch are caused by the same mechanism. ------------------------------------------------------------------------------------------------------------------------------------------ The "true" blue walleye subspecies differed from yellow walleye in more ways than just colour: In most other aspects other than colour, the two subspecies were difficult to spearate. The eyes of the blue walleye were slightly larger, higher on the head, and consequently closer together (interorbital width less). Trautman (1957) showed a greater distance between the preopercle bone and branchiostegial rays, otherwise proportions and counts were very similar. The blue walleye had a different spawning time and place, a slower growth rate and smaller ultimate size, and different depth distribution. - Scott and Crossman, 1973. The last confirmed "true" blue walleye was taken from Lake Erie in 1965. It is now considered extinct. The blue-tinted walleye that are semi-commonly seen in inland lakes throughout Ontario appear that colour because they lack yellow pigment. The slime on walleye...all walleye...is tinted blue because of a protein pigment called sandercyanin. When you lay a yellow layer under the blue slime, they come out looking green. But fish that lack the yellow pigment are silver-white under the slime (kind of like albinos, but it's not true albinism), and therefore all you see is the blue. Good paper explaining all this came out last fall... http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2014-0139#.VWSqLJTFjIU

Pass over this spot nearly every weekend on the way to the far side of the lake. It goes from 30 to 10 feet and back to 30 really quick. Last weekend I decided to stop and drop my video camera and a worm down to about 14' to see if I could catch some action. Dropping a hook & worm produced a catch every time. Anywhere from 6" to 16" smallmouth. Sunday evening my grandson ( 7 ) caught and landed his first fish from here. The screams of excitement were priceless!