Effects of Recreational Fishing on the Population Dynamics of Lake-Dwelling Brook Trout

Curry, R. Allen; Brady, Charles; Morgan, George Emir

doi:10.1577/1548-8675(2003)023<0035:eorfot>2.0.co;2

Cited by 13 publications

(24 citation statements)

References 30 publications

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“…These fall fingerlings are then subject to an m a of 0.40 before recruiting into the population at age 1 the next year. This accords with brook trout mortality rates reported in the literature (Table 3; Hutchings 1993;van Zyll de Jong 2002;Curry et al 2003;Paul et al 2003), but higher mortality rates for brook trout were reported by McFadden et al (1967; Table 2). As stated above, the age-class structure in this model includes greater proportions of ages 3-5 than were observed by McFadden (i.e., to represent northern adfluvial populations; Murphy 2006).…”

Section: Methodssupporting

confidence: 90%

“…Source 3: hooking mortality rates used here vary over the range of hook-and-release mortality rates for salmonids as reported in literature (Shetter and Allison 1955;Warner 1978;Dotson 1982;Schisler and Bergersen 1996). Source 4: we varied angler effort over the range of 0-400 angler-hours ha À1 year À1 ; angler effort over 240 angler-hours ha À1 year À1 has been observed in brook trout fisheries in western Maine (Boucher 2005 ANGLING IMPACTS ON BROOK TROUT AGE STRUCTURE lower than those reported in the literature (range ¼ 0.07-0.12; Quinn et al 1994;Curry et al 2003;van Zyll de Jong et al 2002) to be conservative with respect to the effect of q a on the model and to examine the effects of A and m h on the population density.…”

Section: Methodsmentioning

confidence: 99%

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Assessing the Effects of Catch‐and‐Release Regulations on a Brook Trout Population Using an Age‐Structured Model

Risley

Zydlewski

2010

N American J Fish Manag

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As populations of wild brook trout Salvelinus fontinalis decline across the species' native range in North America, angling regulations such as fly‐fishing only and catch and release are being used by management agencies to conserve fish while maintaining angling opportunities. Postrelease (hooking) mortality may significantly shift the age structure and size structure of populations. To assess the possible influence of catch‐and‐release fishing on brook trout population structure, we applied data from several sources to build a deterministic population model that included age‐classes up to age 5. To assess the potential effect of fishing, we examined the changes in population density and age structure at varying levels of angler effort (0–400 angler‐hours·ha−1·year−1) and hooking mortality rates (0–14%). Assuming a low (5%) hooking mortality rate, trophy brook trout density (ages 4 and 5) decreased by 50% at an angling intensity of 160 angler‐hours·ha−1·year−1. As angling effort increased, the proportion of older fish (ages 3–5) declined further. At very high levels of angling effort (>300 angler‐hours·ha−1·year−1), age‐4 and age‐5 fish were eliminated from the population. Increases in postrelease mortality rates resulted in similar declines for older age‐classes. The results of this simulation indicate that hooking mortality rates as might be common in catch‐and‐release fisheries may significantly shift the age structure of a population, thus reducing trophy angling potential.

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Section: Methodssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Assessing the Effects of Catch‐and‐Release Regulations on a Brook Trout Population Using an Age‐Structured Model

Risley

Zydlewski

2010

N American J Fish Manag

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“…Our findings cannot prove causative relationships among fish indices of biotic integrity, mean trout lengths, and trout density. However, density-dependent growth of brook trout and brown trout has been demonstrated in numerous investigations (Donald and Alger 1989;Marchand and Boisclair 1998;Jenkins et al 1999;Bohlin et al 2002, Curry et al 2003. However, if brook trout experience density-dependent growth and their density is positively related to IBI score (as we found), then one might expect decreased mean length to be associated with high IBI scores as well.…”

Section: Discussionsupporting

confidence: 50%

Relationships between a Fish Index of Biotic Integrity and Mean Length and Density of Brook Trout and Brown Trout in Wisconsin Streams

Griffin

Fayram

2007

Trans Am Fish Soc

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Native brook trout Salvelinus fontinalis and introduced brown trout Salmo trutta support important recreational fisheries in Wisconsin, and coldwater index of biotic integrity (IBI) scores are often used to determine the quality of stream environments for these trout. To successfully manage biotic communities and fish populations, it is important to understand the relationships among metrics of interest. We quantified the relationships among the catch per linear meter (CPE) of brook trout and brown trout, their mean total lengths, and the coldwater fish IBI scores in second‐order and third‐order streams in Wisconsin. Brook trout CPE increased as coldwater IBI score increased, but there was no significant relationship between brown trout CPE and IBI score. The mean length of brown trout decreased as coldwater IBI score increased; the mean length of brook trout and IBI score were not significantly related. The mean lengths of both brook and brown trout decreased with increasing CPE. Balancing the management of trout density, length, and biotic integrity may be difficult in wadeable streams in Wisconsin. Our findings suggest that the increased abundance of brook trout is compatible with high IBI scores but that the increased abundance of brown trout and greater mean lengths are not.

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“…Known as màsimekw by the Eeyou Istchee Cree First Nations people who predominantly use the lake, the brook charr represents an important component of regional subsistence and recreational fisheries in the area (Flick 1977, Berkes et al 1994, Fraser 2005. Elsewhere, the brook charr is a species of management interest because of its susceptibility to fishing and sensitivity to habitat alterations (Flick 1977, Power 1980, Curry et al 2003. Due to increasing human population growth, fishing pressure and economic development in the Mistassini Lake region, as well as a lack of any documented regional traditional or scientific knowledge on this species, there is growing interest from the local community (CNM 2002) and government agencies in compiling knowledge of Mistassini Lake brook charr to facilitate its sustainability.…”

Section: Restoration Of Oil Spill Impacted Populationsmentioning

confidence: 99%

Integrating Traditional and Evolutionary Knowledge in Biodiversity Conservation: a Population Level Case Study

Fraser¹,

Coon²,

Prince³

et al. 2006

E&S

107

108

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ABSTRACT. Despite their dual importance in the assessment of endangered/threatened species, there have been few attempts to integrate traditional ecological knowledge (TEK) and evolutionary biology knowledge (EBK) at the population level. We contrasted long-term aboriginal TEK with previously obtained EBK in the context of seasonal migratory habits and population biology of a salmonid fish, brook charr, (Salvelinus fontinalis) inhabiting a large, remote postglacial lake. Compilation of TEK spanning four decades involved analytical workshops, semidirective interviews, and collaborative fieldwork with local aboriginal informants and fishing guides. We found that TEK complemented EBK of brook charr by providing concordant and additional information about (1) population viability; (2) breeding areas and migration patterns of divergent populations; and (3) the behavioral ecology of populations within feeding areas; all of which may ultimately affect the maintenance of population diversity. Aboriginal concerns related to human pressures on this species, not revealed by EBK, also help to focus future conservation initiatives for divergent populations and to encourage restoration of traditional fishing practices. However, relative to EBK, the relevance of TEK to salmonid biodiversity conservation was evident mainly at a smaller spatial scale, for example, that of individual rivers occupied by populations or certain lake sectors. Nevertheless, EBK was only collected over a 4-yr period, so TEK provided an essential long-term temporal window to evaluate population differences and persistence. We concluded that, despite different conceptual underpinnings, spatially and temporally varying TEK and EBK both contribute to the knowledge base required to achieve sustainability and effective biodiversity conservation planning for a given species. Such integration may be particularly relevant in many isolated regions, where intraspecific diversity can go unrecognized due to sparse scientific knowledge or undocumented TEK, and where governmental agencies and local communities increasingly seek to find common ground on which to address biodiversity issues.

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Effects of Recreational Fishing on the Population Dynamics of Lake-Dwelling Brook Trout

Cited by 13 publications

References 30 publications

Assessing the Effects of Catch‐and‐Release Regulations on a Brook Trout Population Using an Age‐Structured Model

Assessing the Effects of Catch‐and‐Release Regulations on a Brook Trout Population Using an Age‐Structured Model

Relationships between a Fish Index of Biotic Integrity and Mean Length and Density of Brook Trout and Brown Trout in Wisconsin Streams

Integrating Traditional and Evolutionary Knowledge in Biodiversity Conservation: a Population Level Case Study

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