Recent Lake Survey Summaries
Here are preliminary summaries of recent sampling not yet posted on LakeFinder, or survey types not found there. Different gear target fish species and sizes quite differently; for example, northern pike and walleye are better caught by gill nets, while bluegill are better caught with trap nets. Values of black crappie might be from either net type. Spring ("ice-out") sampling targets northern pike, walleye, or muskellunge. Our net-based surveys under-sample largemouth bass; electrofishing better evaluates bass abundances and size structures, but requires extra sampling with different equipment.
Walleye Presence/Growth Checks 2014
To determine presence and/or size of spring-stocked walleye fry before spending effort to harvest, we sampled the three shallow waters operated in 2014 as possible "rearing ponds" (Because local suitable waters and success have been poor recently, our office might occasionally try to raise fingerling walleyes [for stocking lakes in autumn] only in limited locations after severe winters.) Results summaries are below.
Eagle Lake (Carver Co.): Sampled 8/26/14 No walleyes were sampled in multiple lake locations. A silver lining is is abundant young-of-the-year black crappies and several adults were captured, indicating winterkill impacts of 2013-14 did not completely deplete the fish community.
Lakefront Park Pond: Sampled 8/19/14 No walleyes were sampled, but fathead minnows and bluegills were. An angler reported seeing largemouth bass earlier in the summer. Possibility exists for low-level walleye catches if pond conditions allow survival for several seasons.
McColl Pond: Sampled May 2014 Abundant bluegill predation was noted soon after fry were stocked. While some walleyes might survive to provide anglers a bonus if conditions remain suitable, McColl is not viable for harvesting fingerlings to stock elsewhere.
Provisional Lake (Netting) Survey Summaries 2014
Note: the software used separates location and/or sampling-crew data; results are combined once final report is generated and approved.
Spring Sampling 2014
Soon after ice-out, we checked Medicine Lake walleye to see size and age composition of larger adult fish. We also measured the northern pike and largemouth bass captured. Results are from 36 total net locations.
|Fish Species||Number||Average Length (in)||Max. Length (in)|
Winterkill Checks 2014
The cool conditions of spring 2014 allowed us to do some assessment of winterkill impacts. Summary information is below.
Eagle Lake (Carver Co.): Sampled 4/25/14-- entire shoreline electrofished. Only two golden shiner captured and one larger-sized fish too far out of range to ID. Lake was stocked in May at 2.4 times its normal walleye fry quota.
Mitchell Lake (Hennepin Co.): Angler report late May 2014 Despite winter 2013-14 oxygen readings dropping to the low-2 ppm range, no dead fish were reported. In late May, a lake resident sent images of adult northern pike, largemouth bass, and walleye caught from the same location, indicating some adult gamefish survival.