Effects of number of largemouth bass per live-well compared to environmental conditions on post release tournament survival

Maahs, Brandon; Sylvia, Andrea; Weber, Michael J.

doi:10.1016/j.fishres.2021.106101

Cited by 5 publications

(14 citation statements)

References 65 publications

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“…However, the mechanism by which the mortality of individual bass captured at tournaments translates into population-level effects has been vastly ignored, likely in part due to the inherent challenges associated with assessing these critically important effects. We previously found that tournament anglers are proficient at locating and capturing bass (Sylvia et al 2020) and that the mortality of individuals captured during tournaments can be high (Sylvia and Weber 2019;Maahs et al 2021) but that tournament mortality does not reduce overall population abundance (Sylvia et al 2021a). Importantly, the goals of fishing tournaments are to capture the largest fish, which are rare within populations, and this may result in fewer large fish becoming available over time through catchand-release mortality.…”

Section: Discussionmentioning

confidence: 99%

“…2020) and that the mortality of individuals captured during tournaments can be high (Sylvia and Weber 2019; Maahs et al. 2021) but that tournament mortality does not reduce overall population abundance (Sylvia et al. 2021a).…”

Section: Discussionmentioning

confidence: 99%

“…Black bass tournament mortality studies usually involve assessing initial and delayed mortality rates. Numerous studies have identified that increased water temperature, air temperature, and air exposure; handling practices (Cooke et al 2003a(Cooke et al , 2003b(Cooke et al , 2004; increased live-well confinement and density (Maahs et al 2021); and relaxed tournament regulations (Weathers and Newman 1997) can increase the tournament mortality rates of individuals. However, understanding how tournament mortality of individual bass can ultimately affect bass populations remains challenging (but see Kerns et al 2016;Sylvia et al 2021a).…”

mentioning

confidence: 99%

“…2003a, 2003b, 2004); increased live‐well confinement and density (Maahs et al. 2021); and relaxed tournament regulations (Weathers and Newman 1997) can increase the tournament mortality rates of individuals. However, understanding how tournament mortality of individual bass can ultimately affect bass populations remains challenging (but see Kerns et al.…”

mentioning

confidence: 99%

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Assessing Size‐Dependent Population‐Level Effects of Largemouth Bass Tournament Mortality

Sylvia

Weber

2022

N American J Fish Manag

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As black bass Micropterus spp. tournaments continue to grow in popularity, so too must evaluations on the population‐level effects of live‐release angling events. Although factors influencing the tournament mortality of individuals are well studied, assessments at the population level are lacking. We evaluated differences in tournament capture probability and survival of two size‐classes of Largemouth Bass M. salmoides (medium: 381–457 mm; large: >457 mm) using a multistate mark–recapture model. Changes in estimated capture and survival rates of medium and large bass were then simulated to assess potential effects on population size structure. Tournament capture probabilities for medium bass were approximately three times higher than those for large bass, and tournament capture probabilities for both size‐classes increased with air temperature. Medium bass also experienced higher survival rates than large bass after tournaments, and survival rates of both groups declined with increasing water temperature. Our simulations indicated that both increases in tournament capture probability and reductions in posttournament survival of large bass resulted in some reductions in population size structure. However, increases in tournament capture probability or reductions in tournament survival of medium bass or medium and large bass alone had little to no effect. Our results suggest that under the observed tournament conditions, tournaments have little effect on bass population size structure, but size structure could be reduced with higher capture probabilities and lower posttournament survival; this information is useful for managing the fishery effects of tournament angling. Our modeling approach also provides a framework for understanding population‐level effects of tournaments on other populations under alternative conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Assessing Size‐Dependent Population‐Level Effects of Largemouth Bass Tournament Mortality

Sylvia

Weber

2022

N American J Fish Manag

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“…Radiotelemetry.-We implanted radiotelemetry tags (F1835; 14 g in water; 897-d battery life; Advanced Telemetry Systems [ATS], Isanti, Minnesota) in 65 bass during April 2018 and an additional 29 bass in April 2019. See Maahs et al (2021) for additional telemetry tagging details. We then tracked bass weekly by boat from April to November in 2018 and 2019 by using an ATS R4000 telemetry radio receiver and a three-element folding Yagi antenna.…”

Section: Samplingmentioning

confidence: 99%

Effects of Length and Bag Limits on Largemouth Bass Tournament Capture and Mortality

Maahs

Sylvia

Weber

2022

N American J Fish Manag

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Tournament mortality of Largemouth Bass Micropterus salmoides can be a major source of population mortality. Tournament captures and mortality may be reduced through restrictive harvest regulations (bag and length limits), but these approaches for mitigating tournament mortality have not been assessed. We assessed the effects of bass tournament angler bag and minimum length limits on the number of bass weighed in, bass tournament weigh‐in probability, and the reduction in tournament mortality. We tagged nearly 4,000 Largemouth Bass during 205 tournaments and electrofishing events at Brushy Creek Lake, Iowa, from 2015 to 2019. We then used a before–after–control–impact analysis to evaluate the effect of tournament regulations (bag limit: either three or five bass; minimum length limit: no minimum or 305, 330, 356, or 381 mm) on bass monthly catch rates and a capture–recapture model to assess tournament weigh‐in probability among regulation types. Number of bass per tournament angler‐hour was similar among a three‐bass, ≥381‐mm length limit and more liberalized regulations (mean = 0.26 bass/angler/h). Length and bag limits had little effect on bass weigh‐in probability. We estimated that reducing the bag limit from five to three bass would have little effect, while a reduction from three to two bass would reduce the number of bass weighed in by 35% and a bag limit of one bass would result in a 62% reduction. Alternatively, a minimum length limit of ≥381 mm could reduce the number of bass weighed in by over 40%. Tournament mortality was greatest in July and August, but low catch rates during these months resulted in little mortality. Although current length and bag limits did not affect bass weigh‐in probability, the number of bass weighed in and associated tournament mortality may be reduced if bag and length limits are very restrictive (≤2 bass/angler or minimum length ≥381 mm). However, restrictive tournament regulations may not be biologically necessary or socially acceptable.

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Immunomodulation in adult largemouth bass (Micropterus salmoides) exposed to a model estrogen or mixture of endocrine disrupting contaminants during early gonadal recrudescence

Leet,

Richter,

Claunch

et al. 2024

Comparative Immunology Reports

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Effects of number of largemouth bass per live-well compared to environmental conditions on post release tournament survival

Cited by 5 publications

References 65 publications

Assessing Size‐Dependent Population‐Level Effects of Largemouth Bass Tournament Mortality

Assessing Size‐Dependent Population‐Level Effects of Largemouth Bass Tournament Mortality

Effects of Length and Bag Limits on Largemouth Bass Tournament Capture and Mortality

Immunomodulation in adult largemouth bass (Micropterus salmoides) exposed to a model estrogen or mixture of endocrine disrupting contaminants during early gonadal recrudescence

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