This topic of percentages of the BG sizes in a pond is interesting in regards to how many BG this would amount to for the carrying capacity of a pond.

Carrying capacity is usually determined by fertility of the water in terms of the amount of food produced within the entire pond system known as the food pyramid, food web, or food chain. For an infertile pond with low alkalinity and clear water the BG biomass in lbs/ac could be low as in 43-88 lbs/ac, medium of 100 -230 lbs/ac or high for a ‘reasonably’ fertile “backyard” pond that could have 270-660 lbs/ac.

The number of BG that would compose the percentage of BG in each size category would have a lot to do with the number, size and specie of the predators present to eat representatives of each BG (forage) size group. Also having a measurable influence on the BG numbers present would be the amount of harvest and natural mortality. Predation, mortality and harvest. If I understand jpsdad correctly, he has aptly pointed out from his review of published literature, that growth and carrying capacity does not significantly increase until the fish numbers are reduced that are causing or creating the carrying capacity (system fullness). Reduced numbers are from things such as predation or various forms of mortality. Then there is more room or space for fish growth to occur.

The fertile pond category does not necessarily have to be nutrient rich due to chemical fertilizer added directly to the water. The BG(fish) pounds could be grown to higher capacity using fish food pellets as now used by many pond owners. Using fish pellets to grow fish, the total pounds grown as carrying capacity can be very high or dangerously high and in the range of 1000 -2000 lbs per acre that are often achieved by the commercial farms that grow fish for the food market. These are places that produce very carrying capacities of high pounds of fish, as these places constantly live on the brink of fish kills due to low water quality due mainly to too much fish manure. These high fish pounds per acre require special types of artificial aeration and very close constant attention to water quality and some luck to reduce but not prevent fish kills due to conditions of too much “unhappy water”.