Pat :

In most pond mgt. matters there are several ways to manage your goals . There are a lot of good pond mgrs. on this fourm to help with a question or goal. In order to help and give possible suggestions they need to know the goal and facts and then they often go beyond the question with things not considered. Bob Lusk often asks it by saying " why do you want to do that?" , that is what is the goal or reason behind the proposed action.

There are a number of reasons to add F1's or Fla's. or Nort. strain bass depending on goals or reasons. For example to get Fla. {or other strain} genetics in the pond . There are several ways to do this which fourm members can suggest if they know that is the goal.

Bill covered the % question. You can help the % by placing enough cover for the F1's to hide in. There are other ways to manage the situation if that is the goal , like multi-year stocking or stocking larger fish at low rates. Keep your pond balance in mind when setting goals. Example you may want 15 new F1's , if so you are on tract but if the survival rate were 50% then you have 50 and that could cause an imbalance down the road. I know you did not ask about all this . I thougt it might help. ewest

ps : It looks like you are increasing your pond size by 20% how will the fish in the new part effect the overall fish structure once connected based on what S.E. pond Mgt. saw in electrofishing the old part.