Long-term responses of a stream-dwelling grayling population to restrictive fishing regulations

Näslund, Ingemar; Nordwall, Fredrik; Eriksson, Tobias; Hannersjö, David; Eriksson, Ljusk Ola

doi:10.1016/j.fishres.2004.10.018

Cited by 15 publications

(11 citation statements)

References 29 publications

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“…If the population size structure is stabilizing, then the response time (12 years) from harvest closure is equivalent to the lifespan of Bull Trout (Goetz 1989;Erhardt 2010). Näslund et al (2005) found similar responses with Grayling Thymallus thymallus in northern Sweden. Their study found increases in trophy-sized fish for a 10-year period following catch and release implementation; they argued that at least 10 years is needed to fully assess the effects of the restrictive regulations.…”

Section: Status and Trendssupporting

confidence: 66%

Population Changes after 14 Years of Harvest Closure on a Migratory Population of Bull Trout in Idaho

Erhardt

Scarnecchia

2014

N American J Fish Manag

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Primary data (size and age structure, abundance) and derived data (growth, mortality, recruitment) were used to assess the status and trends of Bull Trout Salvelinus confluentus in the North Fork of the Clearwater River, Idaho, under a 14‐year harvest closure. From 2000 (6 years after harvest closure) to 2008, an increase in the number of larger and older migratory Bull Trout occurred, as evidenced by the rightward shift in the cumulative length‐frequency distribution, increases in mean total length and weight, and increases in age. The stability in growth rates over an 8‐year interval indicated that the increases in size structure were age related (e.g., recruitment and mortality changes) rather than growth related. The abundance of migratory spawning adults also steadily increased over the period 1994–2008, as indicated by the increases in redd counts. A logistic model fitted to population estimates (not including unsampled portions of the drainage where migratory Bull Trout are known to exist) indicated that the rate of population growth as of 2005 was beginning to slow and that a carrying capacity of 5,215 total migratory adults will be asymptotically approached, surpassing the U.S. Fish and Wildlife Service's drainage‐wide recovery goal of 5,000 total adults. The results from an age‐structured population model (model 1) indicated a carrying capacity (5,716 migratory adults) similar to that of the logistic model. If the results under model 1 are achieved, the migratory adult population (including nonspawning adults) will surpass 5,000 adults in 2019. The results under a second model depicted a lower carrying capacity (3,592 fish). This analytical approach has promise for application in situations where harvest restrictions or the elimination of fishing are part of Bull Trout restoration programs.Received August 8, 2013; accepted December 11, 2013

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Section: Status and Trendssupporting

confidence: 66%

Population Changes after 14 Years of Harvest Closure on a Migratory Population of Bull Trout in Idaho

Erhardt

Scarnecchia

2014

N American J Fish Manag

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“…Hence, T. thymallus has been classified as a highly vulnerable fish species according to the Bern Convention (1979). As a typical rheophilic species, the most common threats to T. thymallus are the loss or degradation of suitable habitats (Mallet et al, 2000), flow regulation for hydropower production (Ovidio et al, 2008), overfishing (Naslund et al, 2005) and the construction of migration barriers between essential habitats (Persat, 1996). Such changes impose a considerable difficulty for this fish in achieving its entire life cycle (Mallet et al, 2000;Ovidio et al, 2008), and stocking is frequently undertaken with the aim of supporting wild populations (Cowx, 1994).…”

Section: Introductionmentioning

confidence: 99%

Radio‐telemetry shows differences in the behaviour of wild and hatchery‐reared European grayling Thymallus thymallus in response to environmental variables

Horká

Horký

Randák

et al. 2015

Journal of Fish Biology

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Juvenile wild and hatchery-reared European grayling Thymallus thymallus were tagged with radio-transmitters and tracked in the Blanice River, River Elbe catchment, Czech Republic, to study their behavioural response to stocking and environmental variation. Both wild and hatchery-reared T. thymallus increased their diel movements and home range with increasing light intensity, flow, temperature and turbidity, but the characteristics of their responses differed. Environmental variables influenced the movement of wild T. thymallus up to a specific threshold, whereas no such threshold was observed in hatchery-reared T. thymallus. Hatchery-reared fish displayed greater total migration distance over the study period (total migration) than did wild fish, which was caused mainly by their dispersal in the downstream direction.

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“…Better accessibility of a fishing ground leads to more anglers, and more anglers result in higher catch and yield. Others also reported that changes in fishing regulations may significantly affect angling catch and yield (Askey, 2016;Naslund, Nordwall, Eriksson, Hannersjö & Eriksson, 2005;Naslund et al, 2010;Schill & Kline, 1995;Van Poorten, Cox & Cooper, 2013).…”

Section: Discussionmentioning

confidence: 99%

Do recreational fisheries metrics vary on differently sized fishing grounds?

Lyach

Čech

2018

Fisheries Management Eco

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This study aimed to assess the relationship between basic metrics in recreational fishing and the size of the fishing ground. Data were obtained from individual angling logbooks collected by the Czech Fishing Union over 12 years on 212 fishing grounds located in the regions of Prague and Central Bohemia in the Czech Republic. Small fishing grounds had the highest catch, yield, numbers of fishing visits and numbers of angling guard controls per hectare. Medium‐sized fishing grounds had the highest catch, yield, and numbers of both fishing visits and angling guard controls per fishing ground. Anglers returned to medium‐sized fishing grounds most frequently. The percentage of anglers who caught and took home at least one fish decreased with increasing size of the fishing ground. In conclusion, basic metrics in recreational fishing are related to the size of the fishing ground, which thus plays an important role in fisheries management.

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Long-term responses of a stream-dwelling grayling population to restrictive fishing regulations

Cited by 15 publications

References 29 publications

Population Changes after 14 Years of Harvest Closure on a Migratory Population of Bull Trout in Idaho

Population Changes after 14 Years of Harvest Closure on a Migratory Population of Bull Trout in Idaho

Radio‐telemetry shows differences in the behaviour of wild and hatchery‐reared European grayling Thymallus thymallus in response to environmental variables

Do recreational fisheries metrics vary on differently sized fishing grounds?

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