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This is just a guideline they use in my province. A ten year old pike in the more Southern part of my province is around 15 lbs. Most of these lakes have warm waters.A ten year old pike in the Central area of my province is around 9 lbs. The lakes in this are are usually getting a bit deeper and cooler.A ten year old pike in the far North is 4 lbs, these lakes are usually deep and cold all year long.It seems that the average temperature of the lake through out the year and the availability of nutritious food are two large factors in determining a pike's size.
So in general Pike grow large when they are Happy, i.e Warm and Fed.... I can Identify with that