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Last Updated:Friday 16 March 2012, 17:57

Handling the Hydrilla in the Mill Pond

Written by  Kelly Riley 30 January 2012 Published in Action in Jackson
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“Grass Wars” At the Mill Pond 

 Florida Wildlife and Game Commission Releases 1000 Grass Carp into the Mill Pond

Those of us that grew up remember the pristine waters of Blue Springs and the Mill Pond before hydrilla and eel grass was inadvertently introduced in to the water system. The water was clear and easy to navigate. Now the hydrilla is so thick in places it is impossible to navigate a boat through it. Hydrilla is a very invasive aquatic plant that was introduced to lakes and rivers by people dumping aquarium plants in to the water, and by boaters launching with hydrilla from other lakes clinging to their trailers. Hydrilla has become the kudzu of the water. Over the past thirty years this plant has wreaked havoc on water systems throughout the U. S. If left unchecked, hydrilla will eventually overtake a lake and kill of most the fish.

The Florida Wildlife and Game Commission, working in conjunction with the Jackson County Department of Parks and Recreation has initiated a program to combat the hydrilla in the Mill Pond. The Program consists of three steps: 1) draw down of the water level, 2) release of grass carp, and 3) herbicide spay of the remaining hydrilla in the vicinity of the spring and swimming area.

Phase 1 is already complete and the Mill Pond has been drawn down. By drawing down the water level much of the hydrilla in the shallower water is left high and dry where it is exposed to frost and dies. Phase 2 of the program, the releasing of the grass carp, has just been completed. The last time grass carp were released in to the pond was about 12 years ago. These fish are prolific eaters and love hydrilla. The carp, when released, are about 8 to 10 inches long. The commission waits to release the fish until they are this size to keep them from being preyed upon by larger predatory fish. These fish are bred with an extra chromosome so they are sterile. If they were allowed to breed they would eventually become a problem themselves. Grass carp grow to a size of up to 40 to 50 pounds and live for 15 to 20 years. However, after they reach full size their rate of consumption slows down dramatically. So they have about a 7 to 8 year span during which they are an effective control of hydrilla growth.

Phase 3 will begin in February. They will apply a direct contact herbicide using large spay guns. The herbicide is specially formulated so that it dissipates in the water rapidly and is undetectable in the water only hours after application.

Our rivers and lakes are great asset to our community and we appreciate the efforts of the Florida Wildlife and Game Commission and the Jackson County Department of Parks and Recreation's efforts to keep them healthy.

To learn more watch the video "1000 Grass Carps Released in to the Mill Pond".

Last modified on Tuesday, 31 January 2012 16:32

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