Risks Associated With Too Much Vitamin E. Except for an anticoagulant effect, vitamin E has no known toxicity or side effects. There was a meta-analysis conducted by John Hopkins in 2004 that raised some concern about higher daily intakes, but this was most likely associated with pre-existing health conditions.
BUT-those four pike averaged 7 pounds each. That's 28 pounds of northern pike in a 3-acre pond, or nearly 10 pounds/acre of water. Compared to waters across North America, that is a high biomass (poundage) of northern pike. But, think about that. Four fish lived in an area bigger than three football fields.
Rates of 20 to 255 grass carp per acre (50 to 638 fish per hectare) have been found to provide effective control of hydrilla. Removal of hydrilla with 40 fish per acre (100 per ha) is shown in Figure 3 and Figure 4. A dense growth of any weed will obviously require more fish than a sparse amount of the plant.