We review sportfishing regulations in Minnesota and across North America discuss potential visions for the future of regulations. Creel limits are ubiquitous they have been generally set arbitrarily with little biological justification. Anglers may not accept reductions creel that actually decrease total harvest. Length-based now common most American sport fish management agencies had numerous water-specific length-based The fishing could continue to get more complex but there substantial...

Abstract Natural resource decision makers are challenged to adapt management a changing climate while balancing short-term goals with long-term changes in aquatic systems. Adaptation will require developing resilient ecosystems and Decision already have tools develop or ensure systems fisheries such as managing harvest riparian zones. Because often interacts multiple stakeholders, adaptation strategies involving managers other partners focused on land use, policy, human systems, coupled...

An empirical model was developed that describes the influence of lake productivity, climate, and morphometry on coldwater fish oxythermal habitat. habitat variable called temperature at 3 mg·L –1 dissolved oxygen (T DO3 ) by interpolating water a benchmark concentration (3 from temperature–oxygen profile. Coldwater most available in least productive lakes (total P < 25 µg·L with greatest relative depths (geometry ratios 2 m –0.5 where mean July air temperatures were less than 17 °C....

Eutrophication and climate warming are profoundly affecting fish in many freshwater lakes. Understanding the specific effects of these stressors is critical for development effective adaptation remediation strategies conserving populations a changing environment. Ecological niche models that incorporated individual nutrient concentration were developed 25 species sampled standard gillnet surveys from 1,577 Minnesota Lake phosphorus concentrations climates hindcasted to pre-disturbance period...

Abstract Ciscoes Coregonus artedi are coldwater stenotherms that sensitive indicators of ecological stressors, such as eutrophication and climate warming, reduce habitat. Temperature oxygen profile data were collected during cisco mortality events at 17 lakes an unusually warm summer in Minnesota 2006. Combinations temperature from the profiles mapped onto a two‐dimensional niche space to directly quantify oxythermal lethal boundary for ciscoes. Quantile regression was used estimate...

Abstract Climate change is a global persistent threat to fish and habitats throughout North America. Climate-induced modification of environmental regimes, including changes in streamflow, water temperature, salinity, storm surges, habitat connectivity can physiology, disrupt spawning cues, cause extinctions invasions, alter community structure. Reducing greenhouse emissions remains the primary mechanism slow pace climate change, but local regional management agencies stakeholders have...

Abstract Total phosphorus (TP) concentrations are known to be a significant factor influencing fish populations in Minnesota lakes. Consequently, primary focus of the Department Natural Resources address habitat lakes across state has been determine relationships between TP and watershed conditions Because vary widely corresponding differences geomorphology, nutrient criteria were established by Pollution Control Agency for specific ecoregions. To refine these managed fishing, we gathered...

Abstract The cisco Coregonus artedi is the most common coldwater stenothermal fish in Minnesota lakes. To project its chances of survival under future warmer climate conditions, an oxythermal habitat variable, i.e., water temperature at 3 mg/L dissolved oxygen stratified lakes (TDO3) was calculated from simulated daily and DO profiles 30 lake types past (1962–2008) conditions two scenarios. mean TDO3 values over a 31‐d fixed benchmark period were for each years then averaged simulation type....

A deterministic, process-oriented, dynamic and one-dimensional year-round lake water quality model, MINLAKE2010, was developed for temperature (T) dissolved oxygen (DO) simulations to study impacts of climate warming on cisco fish habitat. The DO model is able simulate metalimnetic maxima in vertical profiles oligotrophic lakes. calibrated with profile data from the 28 lakes Minnesota; two-thirds them are deep mesotrophic/oligotrophic that support cisco, a coldwater species. average standard...

Tingley RW III, Paukert CP, Sass GG, Jacobson PC, Hansen GJA, Lynch AJ, Shannon PD. 2019. Adapting to climate change: Guidance for the management of inland glacial lake fisheries. Lake Reserv Manage. 35:435–452.Climate change is altering fisheries in United States, presenting a complex challenge managers. Here we provide regional perspective guide heterogeneous and yet interdependent fishery resources lakes upper Midwest. Our main objective was promote adaptation by outlining processes that...

Recent research has indicated that creel limits are largely ineffective in regulating recreational fish harvest Minnesota. Current give an unrealistic picture of the biological capabilities Minnesota's fisheries and less than 5% angler-trips culminate with harvesting a limit. We present evidence high may cause anglers to have expectations their potential harvest. When fishing success not met, result is often dissatisfied anglers. propose reducing more appropriate levels by using probability...

Cold-water habitat in lakes is projected to decrease under future climate scenarios, and existing trends suggest such declines are already impacting cold-water fish populations. Herein, we predict the effects of land use change on glacial upper midwestern US. Ecoregion-specific, regional regression models were developed annual phosphorus loading rates based hydrology coupled a previously model. Outputs from one model three global then used project habitat. Significant decreases quality all...

Abstract Lakes in Minnesota face a number of large-scale ecological stressors that threaten critical aquatic habitat and fish populations. We developed conservation framework to guide protection restoration efforts for lakes the state. Surrogate measures quality were used assess conditions more than 1,800 lakes. Two fundamental types described (physical water quality) geographic information system-based surrogate condition (shoreline watershed disturbance) quantified each type. Simultaneous...

Two primary goals in fisheries research are to (i) understand how habitat and environmental conditions influence the distribution of fishes across landscape (ii) make predictions about fish communities will respond anthropogenic change. In inland, freshwater ecosystems, quantitative approaches traditionally used accomplish these largely ignore effects species interactions (competition, predation, mutualism) on shaping community structure, potentially leading erroneous conclusions regarding...

ABSTRACT Survival and growth of hatchery‐reared bay scallops ( Argopecten irradians ) transferred to a shallow coastal area in outer Jordan Cove, Connecticut, were monitored by SCUBA during the summer fall 1979. In all, 47,000 released over 4 sequential seedings. Based on slopes derived from linear regression models time 50% loss release areas was less than one day for juveniles ≤22 mm ≥6 days ≥24 mm. Significant (α = 0.05) reductions rate occurred as scallop size increased at release....

Abstract The Cisco Coregonus artedi is a planktivorous fish that widely distributed in lakes across glaciated areas of North America. With retreat Laurentide ice, dispersed from refugia into vast network meltwater (proglacial) eventually receded, stranding populations depressions—today’s lakes. Refugial also colonized fell outside the footprint proglacial lake. These two types lakes, those inside lake and footprint, though uncounted, number high hundreds or more. All 53 reported to contain...

Abstract Managing ecological systems for resilience can increase their capacity to maintain key functions even under global change. Oxygenated coldwater (oxythermal) habitat in lakes is an important resource that threatened by both climate change and eutrophication. Here, we quantify the of oxythermal over 10,000 glacial upper Midwestern United States watershed disturbance classify conservation prioritization based on current conditions resilience. Oxythermal was predicted lake morphometry,...

Fishes reared in captivity are predator-naïve and suffer large predation mortality when stocked into lakes with a full complement of predators. We tested the potential predator training to enhance post-stocking survival hatchery-reared walleye (Stizostedion vitreum). In first part study, we found that (i) use chemical cues for assessing risk, (ii) do not have innate recognition odor northern pike (Esox lucius) as an indicator predation, (iii) associate risk after single simultaneous...

Abstract The effect of a reduced daily limit (from 30 to 10 fish/d) on the size structure bluegills Lepomis macrochirus in eight Minnesota lakes was measured with controlled and replicated experiment. Bluegills from four treatment (daily fish) control were sampled 2 years prior regulation implementation fourth fifth after implementation. Repeated‐measures analysis variance used test for changes two measures structure: mean length 90th percentile length. trap nets significantly greater than...

Abstract A generalized additive model was developed that described the effects of fingerling stocking density on abundance walleyes Sander vitreus in 551 lakes Minnesota. Walleye measured as a catch per effort (CPE) from 1,511 standard Minnesota Department Natural Resources gill‐net assessments conducted during 1986–2004. In addition to stocking, lake morphometry, productivity, and fish community variables walleye CPE were also using model. Lake morphometry had sharply nonlinear abundance....