This is not a linear question. You can't count males and females in that manner for reproductive purposes. It is a giant "it depends" question.

Some facts

BG males have multiple females drop eggs in their nest. Then the female moves on and repeats with another male and so on. So eggs per pair doesn�t work.

With different #s of spawns depending on location you can't get accurate #s on a per spawn basis. Plus there are major and minor spawns in locations where there are several spawns (not all the same in #s of spawners and offspring per spawn).

In the south in a new pond a BG born in March can spawn by late summer. That is not true up north due to slower growth rates and early cold water (even BG don't normally engage in futile reproductive strategies).


Scientific data indicated that fecundity is about 80,000 eggs per female per year (efish) although other sources have different #s but still close for an average.

Put some xmas trees around where the spawning areas will be. I do think it is safe to say you will have a pond full of BG by fall 13.

Here is a thought -- 85 X 80,000 = 6,800,000 less predation and other natural morts = a lot and even more if you feed them.




Last edited by ewest; 09/26/12 07:55 PM.