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Of course weather plays a factor and so does many other things. There are many variable factors that can affect spawning success. The main way to over come this is to maintain the spawning stock at a level that will over come these issues.
Importance of big breeders is that they produce more egges. If only a small percentage of the fish will make it to one year old, the more eggs there are the more fish you have in the end.
If anything the posted article highlights the importance of protecting the breeding stock.
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Hybrid Mode
