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6 E• The pondweed problem was anticipated from the 1991 HERBICIDE: experiences. The NFWG decided to use a herbicide. Arizona Game and Fish (AGFD) coordinated the application of a herbicide permit with the National Park Service (NPS). The review process took much longer than anticipated and the application is still pending approval. A decision was then made to purchase a liner for part of the cove. This was done and the liner is to be installed in early 1993. DAVIS COVE: The year started out with the addition of another backwater to the rearing effort. Davis Cove, located between Katherine's Landing and Davis Dam was selected as a grow out area. The backwater is, approximately 3 acres in size with a minimal operational depth of 12 feet, unlike Yuma Cove's 1 foot. Fish produced at Yuma Cove and Dexter National Fish Hatchery are stocked into the cove to grow to 12 inches prior to release into the main reservoir. NET PLACEMENT: Approximately 25 volunteers from the participating NFWG agencies installed a barrier net across the mouth of the cove during February 4-5. The net is-anchored-w- ith concrete, supported with a floatation boom, and designed to fluctuate with the reservoirs 17 foot operational zone. Reclamation coordinated the effort and NPS divers installed the anchoring system. The net is inspected by divers bimonthly to insure its integrity. FISH REMOVAL: The placement of the barrier net trapped resident fish inside Davis Cove. Attempts were made to remove non-native fish from Davis Cove and released them unharmed into the reservoir. Fish were collected during the week of June 16 using electrofishing, gill netting, fyke netting, seining, and angling which resulted in the removal of approximately 800 pounds of fish. The size and depth of Davis Cove made it impossible to remove all the fish and some predation was expected and has occurred. J