Lovely pictures,looks like an enjoyable day. The colour of a Pike can vary from water to water depending on Habitat,i havent seen one that colour before it looks lovely.
Ive seen very pale coloured pike to very deep green,one water i know of the Pikes main source of food is Frogs.Every year the water looks like a carpet of tadpoles all over,and the Pike feed openly and often on them.
Ive also seen an Albino pike and a black one too,so there are a few variations that crop up,
Heres a black one.....
This fellow caught an Albino on a day trip to Coniston....