Look for the huge pike

Out with a friend today, we had lunch and walked afterwards. If you look carefully at this photo taken with my phone you can see some of the large pike in the river. Several were up to 3' long... It is a long time since I saw so many. However there was plenty for them to feed on. Lots of small brown trout, huge dragon flies and butterflies... Not sure what else pike eat... The fish can be seen on the left/centre about 1/3rd way down... There were about 50 but I only had my phone with me. A polarized lens would have shown up far more... Maybe there is a polarizing App for an Android phone... Must look...