Explanation for the calculation..

If you are to formulate fish feed of 45% c.p for your 1month juvenile using the following:
For energy source
Maize, cassava.
For Protein source
Fishmeal, GNC, soybeans.
USINg PEARSON’S METHOD.
At the upper right hand of rectangle fix your Protein value and at the bottom right hand fix your energy value, in the middle of the rectangle fix your 45% cp.

Check the pix of the calculation I posted for clarity.