2010
DOI: 10.1007/s10750-010-0119-9
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High lacustrine gillnet catchability of anadromous Arctic charr

Abstract: Arctic charr is the only freshwater fish in most of the High Arctic, with both resident, anadromous, and landlocked populations present. The anadromous Arctic charr is particularly highly sought-after, and has been an important food source for people living in Arctic regions. A recent decline in harvest in many areas has been related to overexploitation by extensive gillnetting. Very few studies, if any, have estimated the gillnet efficiency for harvesting anadromous Arctic charr. In this study, all anadromous… Show more

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Cited by 7 publications
(4 citation statements)
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“…The SAM estimated density and population at length with high uncertainties. To reduce uncertainties, gear selectivity investigators will need to directly estimate the number of fish at length in one or preferably many populations (e.g., Borgstrøm et al 2010). We assumed that an adjusted gill- 120 net CPE for Walleye was directly proportional to density.…”
Section: Discussionmentioning
confidence: 99%
“…The SAM estimated density and population at length with high uncertainties. To reduce uncertainties, gear selectivity investigators will need to directly estimate the number of fish at length in one or preferably many populations (e.g., Borgstrøm et al 2010). We assumed that an adjusted gill- 120 net CPE for Walleye was directly proportional to density.…”
Section: Discussionmentioning
confidence: 99%
“…Intraspecific lacustrine competition can be an important mechanism regulating recruitment of young brown trout from nursery areas into lakes (Borgstrøm ; Borgstrøm et al. ), and the density of young salmonids has been shown to increase when the number of adult fish decrease (Jensen ; Lorenzen & Enberg ; Grossman et al. ).…”
Section: Discussionmentioning
confidence: 99%
“…This migration of older year classes probably increases the survival of the remaining younger year classes (in the river), through the effects of reduced inter-and intracohort competition. Intraspecific lacustrine competition can be an important mechanism regulating recruitment of young brown trout from nursery areas into lakes (Borgstrøm 1992a;Borgstrøm et al 2010), and the density of young salmonids has been shown to increase when the number of adult fish decrease (Jensen 1977;Lorenzen & Enberg 2002;Grossman et al 2012). Therefore, the low number of 1-3-year-old trout in the catches in Lake Møkkelandsvatn in 1989 (before the removal of charr) was possibly due to low catchability, but most probably because these age groups were not fully recruited from their natal rivers.…”
Section: Discussionmentioning
confidence: 99%
“…Finally, gillnets do not damage bottom ecosystems, unlike trawling gear (Althaus et al, 2009; Kenchington et al, 2001; Olsgard et al, 2008). Gillnet catchability coefficients often used to estimate fish abundance (Borgstrøm et al, 2010; Giacomini et al, 2020). Catchability can be estimated directly comparing gillnet catches to a known population size, e.g., hydroacoustics (DuFour et al, 2019; György et al, 2012; Hansson & Rudstam, 1995) or using a statistical approach (Griffiths et al, 2007).…”
Section: Introductionmentioning
confidence: 99%