essup: I have always heard that explanation, but when I google "Biomass" I can't relate what I read to a fish taking up some physical space in the water. If you put "fresh" grass carp in with the older ones it seems to me you will get more vegetation eaten than with just the new ones. A very well respected pond boss I spent some time with lately gave me this as a concept. Unless your water is "crowded" I can't see that the old ones cause any harm. The highly respected guy I was talking to sometimes lurks here. Perhaps he will chime in
"I love living. I have some problems with my life, but living is the best thing they've come up with so far." � Neil Simon,
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