No two ponds are alike.
No two ponds' surroundings and (micro)climates are alike.
No two sets of starting conditions are alike.
No two fish delivery routes are alike.

These are just some of the reasons why "Your Mileage May Vary", and accuracy is at increased hazard when we say "always" or "never".

"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]