Iowa Department of Natural Resources Chris Larson
Carter Lake Fishery
Fish Population Dynamics
What factors influence fish populations * Indicates potential problems at Carter Lake WATER QUALITY* Watershed* Nutrients* Sediments* Algae* Bacteria* etc. Basin slope* Habitat* Productivity* Lake size Exotic species (plant & animal)* Temporal Harvest Growth Survival* Species Diversity Water levels (high or low)*
What Influences Fish Population Dynamics? Reproduction Survival Recruitment Mortality Harvest Natural Predation Fish Population Dynamics Growth Density Competition Habitat Spawning Winter Cover Water Quality Species Diversity
What can DNR do to Affect Fish Populations? Stocking Regulations Habitat improvement Water Quality improvement Education Renovation
What’s there now? Electrofishing
Netting
Fish species found in Carter Lake Gizzard shad Yellow bass Bluegill Crappie Freshwater drum Common carp Bigmouth buffalo Channel catfish bullhead Walleye Largemouth bass
Game Fish!
# sampled = 285 There appears to be a good population of white crappies with some large fish.
# sampled = 125 There appears to be a good population of black crappies with numerous fish at the size that anglers like to harvest.
# sampled = 498 Carter Lake has a decent bluegill population with size structure that are available to anglers.
# sampled = 26 We did not sample very many small bass, which is a concern, but the fish appeared to be in good body condition. Poor water quality is probably hampering largemouth bass survival.
# sampled = 28 There are at least four different sizes of channel catfish, which is good. We annually stock 6,000 seven inch catfish in Carter Lake. I have had discussions with Nebraska Game & Parks this fall and we have agreed to split catfish stockings on an annual basis starting in 2006.
# sampled = 32 Common carp cause a variety of problems, most notably - poor water quality.
Other fish sampled # Black bullhead = 424 # Yellow bass = 470
Improvements that will benefit the fishery at Carter Lake 1. Improve water quality. a. Watershed improvement techniques (reduce stormwater run-off & lawn fertilizer) b. Water quality education c. Lake deepening (dredging) d. Expand no-wake zones e. Commercial fish removal (harvest) of common carp and bigmouth buffalo 2. Habitat improvement a. Shoreline protection (develop/protect near shore vegetation or rock rip-rap) b. Removal of soft sediments (dredging) c. In-lake contour changes (rock reefs, drop-offs, channels) d. Small rock spawning beds 3. Fish Renovation 4. Improved angler access a. Jetty construction b. Fishing piers
Good Water Quality + Good fishing = Recreational & economic benefits for local community
Questions?