Sometimes undesirable fish numbers increase and pressure other populations. Restocking certain fish solves some problems, as does harvesting or removing others. Each pond's particular situation will dictate what action should be taken. Varying amounts of plants are desirable depending on the pond's use. But when plants interfere with fishing and access to the pond, they have become weeds.
Corrective measures are either chemical, biological or mechanical.
Chemical control involves applying an aquatic herbicide approved for this use by the Environmental Protection Agency. The third method of aquatic vegetation control is mechanical, or simply pulling the undesirable plants. This only works if there are not too many weeds to remove. Water quality can be a problem in ponds. Pond water can range from crystal clear to pea-soupy green, but neither extreme is desirable.