Don't Overthink It!

[Nena82]

4 9 14 25 10 17
9 26 9 19 16 6
13 2 10 7 9 11
14 11 7 19 3 10
6 21 9 12 3 25
8 8 4 2 15 17
7 11 9 15 1 7
2 25 2 16 25 10
5 6 1 3 11 24
18 26 16 8 6 18
4 6 19 5 22 3
24 9 10 26 10 1
18 12 12 21 20 13
5 21 23 11 21 5
1 3 18 3 3 2
17 5 21 9 26 8




[Hint 1] One fish, two fish, ___ ____, blue fish.

[Hint 2] Not a cipher!

Been looking at this puzzle for months. Don't even know where to start since it is not a cipher.
Any help???

[Tuvok]

http://worleygig.blogspot.co.uk/2008/02/one-fish-two-fish-red-fish-blue-fish.html

[Zacs-Master]

As there are no numbers above 26 and there are 26 letters in our alphabet, I would start with that.

[Nena82]

I already tried substituting numbers for letters. I did it both forward and backward.