Try introducing some beneficial vegetation like american or other cultivar of pondweed. The PK shrimp love it, and it's easy to seine and fish through. With luck after establishing beneficial vegetation it will tie up enough nutrients to prevent invasive or undesirable vegetation from growing, like FA or your Primrose. I have literally thousands of seeds during the summer - sure you have pondweed close to you somewhere and seeds available.


Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

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