By-catch in the Saginaw Bay, Lake Huron commercial trap net fishery

MacMillan, Eric; Roth, Brian M.

doi:10.1016/j.jglr.2012.03.001

Cited by 8 publications

(7 citation statements)

References 28 publications

(34 reference statements)

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“…; Ellender et al. ; MacMillan and Roth ). Results of this study will help fisheries managers interpret the potential bias that gill‐net sampling may have on spatial and seasonal relative abundance, size structure, and habitat associations of these nontarget populations in similar large reservoirs.…”

Section: Discussionmentioning

confidence: 99%

“…This study has also provided insight into the temporal and spatial patterns of several common nontarget species. Standardized sampling approaches are typically designed to target specific species (Bonvechio et al 2008;Bacula et al 2011), but routinely data are collected and analyzed for a multitude of other species and may represent the only information available for those nontarget species (Wuellner et al 2011;Ellender et al 2012;MacMillan and Roth 2012). Results of this study will help fisheries managers interpret the potential bias that gill-net sampling may have on spatial and seasonal relative abundance, size structure, and habitat associations of these nontarget populations in similar large reservoirs.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

Schall

Schoenebeck

Koupal

2019

N American J Fish Manag

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Sampling is often standardized with regard to time and space to monitor population characteristics. Effective sampling of large reservoirs can be complicated by the inherit bias of habitat variability along the reservoir gradient. Our objective was to assess spatial and seasonal distribution patterns of target and nontarget fish species in a large reservoir to identify potential sources of bias. A multitude of fish community and habitat characteristics were measured during seasonal (spring, summer, and fall) gill‐net surveys in 2015 and 2016 at Lake McConaughy, Nebraska. Spatial assessments along the longitudinal gradient (up‐reservoir to down‐reservoir) and between opposing shorelines were made for fish metrics from the seven most common species, and associations between species‐specific relative abundance and habitat data were examined. Spatial differences in relative abundance and size structure occurred for nearly all species, with the greatest spatial variability occurring between the upper and lower reservoir zones, but few strong correlations were observed between species‐specific relative abundances and habitat data. Seasonal differences occurred in relative abundance and size structure for most species, and size structure was lowest in the fall for most species. To reduce the impact of spatial variability, we determined the minimum required sampling effort to achieve precise estimates of mean catch per net‐night using two resampling strategies, with 16 or fewer gill‐net sets required for five of seven species and 14 or fewer required if a stratified random approach is utilized. This research quantifies the extent of spatial and temporal variability in standardized sampling on a large reservoir and provides novel insight for managers of similar systems considering a stratified random approach to reduce sampling effort while maintaining desired levels of precision.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

Schall

Schoenebeck

Koupal

2019

N American J Fish Manag

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“…estimated that the value of the recreational fishery of Saginaw Bay to Michigan in terms of economic activity generated was US$33 million per year between 2008 and 2010. As a follow up to MacMillan and Roth (2012), an expanded study of the Walleye commercial by-kill in Lake Huron was proposed, estimated to cost $496,000 (B. Roth, Michigan State University, personal communication). Amortized over our 50-year simulation period, the study cost would be $9,920/year, This is well below the EVPI of 5.5% ($2,211,000) of the annual recreational fishery value of $33 million total in economic activity .…”

Section: Discussionmentioning

confidence: 99%

“…The second critical uncertainty was whether the true value of commercial by-kill was best reflected by the lower value estimated for the period when by-kill was directly observed by MacMillan and Roth (2012) or the larger value that reflected an extrapolation to the remainder of the year (Table 1). Most managers were skeptical that the true value was as great as the extrapolated value because the measurements were limited primarily to one fisher and because of the potential for seasonal differences outside the warmer months.…”

Section: Methodsmentioning

confidence: 99%

Use of a Structured Approach to the Analysis of Management Options and Value of Information for a Recreationally Exploited Fish Population: A Case Study of Walleyes in Saginaw Bay

Fielder

Jones

Bence

2016

N American J Fish Manag

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Saginaw Bay Walleyes Sander vitreus contribute to fisheries throughout Lake Huron including a recreational fishery and by‐kill stemming from the state‐licensed commercial fishery in the bay. Two critical uncertain states of nature exist concerning the true magnitude (catchability) of the by‐kill and the future of Alewives Alosa pseudoharengus in Lake Huron, the latter being a strong determinant of Walleye recruitment. After consulting with fishery managers, a stochastic simulation model was developed and used to evaluate management options for the recreational fishery in the form of a decision analysis and the value of information for improved estimates of by‐kill magnitude. Decision analysis sought to identify the maximum sustainable recreational harvest. Sustainable harvest was defined as the average across 250 stochastic simulations for each management option considered while penalizing any simulation year with a value of zero if sustainability criteria were exceeded. Decision analysis indicated that sustainable harvest would be maximized if recreational fishing mortality were increased 50% from recent levels. Realizing this potential, however, would require more intensive management to ensure that desired levels of fishing mortality occurred. Choices by managers for allocating surplus harvest are a matter of policy, but concerns over maintaining predation pressure on Alewives to suppress their resurgence may be reasons to manage conservatively by electing instead to maintain a higher predator abundance. The value of information analysis revealed that the improvement in the recreational fishery warrants investment in further research on the uncertainty over by‐kill catchability. Received June 25, 2015; accepted November 20, 2015 Published online March 31, 2016

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“…Table 3 shows that the context variables change in water temperature, capture depth, fishing duration, duration of air exposure and density in the net affect mortality across several gear types. A larger change in water temperature due to higher temperatures of surface water resulted in higher mortality of fish caught by trawl Hyvärinen et al, 2008;Olla et al, 1998;Suuronen et al, 2005;Uhlmann et al, 2016;Van Beek et al, 1990), hook Düzbastilar et al, 2016;Milliken et al, 2009), purse seine (Marçalo et al, 2008(Marçalo et al, , 2010, gillnet (Bettoli and Scholten, 2006;Broadhurst et al, 2009) and trap (MacMillan and Roth, 2012). A larger change in water temperature can expose fish to thermoclines, i.e., changes in water temperature that exceed fish' tolerance limits (Olla et al, 1998).…”

Section: Influence Of Fish Characteristics On Mortalitymentioning

confidence: 99%

Fish welfare in capture fisheries: A review of injuries and mortality

et al. 2018

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Concerns about the welfare of production animals have extended from farm animals to fish, but an overview of the impact of especially capture fisheries on fish welfare is lacking. This review provides a synthesis of 85 articles, which demonstrates that research interest in fish welfare in capture fisheries has increased over time and that research has focused more on trawls and hooks than on purse seines, gillnets, traps and seines. We found that various gear characteristics, fish characteristics and context variables affect external injuries and mortality. Although the influence of gear characteristics on injuries and mortality can by nature not be compared across gear types, synthesis of the articles reviewed shows that fish characteristics and context variables influence injuries and mortality across gear types. In terms of fish characteristics, decreasing fish length and certain fish species were associated with higher mortality. In terms of context variables, greater capture depth and a longer fishing duration were associated with more injuries and higher mortality, whereas a large change in water temperature, a longer duration of air exposure and a high density in the net were associated with higher mortality. These relations provide options to reduce injuries and mortality from commercial capture fisheries. Implementation of such options, however, would require analysis of potential tradeoffs between welfare benefits, and ecological and economic consequences.

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By-catch in the Saginaw Bay, Lake Huron commercial trap net fishery

Cited by 8 publications

References 28 publications

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

Spatial and Temporal Variability in a Large‐Reservoir Fish Assessment and Application of a Stratified Random Sampling Approach

Use of a Structured Approach to the Analysis of Management Options and Value of Information for a Recreationally Exploited Fish Population: A Case Study of Walleyes in Saginaw Bay

Fish welfare in capture fisheries: A review of injuries and mortality

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