KC Ml might tell you less than this along with others but for small ponds I like at least 15/acre if you lose 3 it makes a major impact. However if you lose 3 when stocking 50 in 5 acre not as big a deal, a numbers thing. SO my rec. are on a case by case basis but in genral 1/4 acre 5, 1/2 acre 8, 1 acre 12, 2 acres 18, 5 acres 40 and 10 acres 60 with soemthing like millfoil.
The other major diff is stocking size many times numbers are based on 8-10 inch and as mentioned wil be gone in a few days with minimal survivial by stocking bigger ones we are able to reduce stocking rates to ones mentioned above.
DW, many of the native grasses are easily crushed by the grass carp pharg. teeth. However with coontail and milfoil not as easy to consume, so they eat the steak first and then work their way down to the bologna sandwich.
