Great Blue Heron Predation on Stocked Rainbow Trout in an Arkansas Tailwater Fishery

Hodgens, Lynn S.; Blumenshine, Steven C.; Bednarz, James C.

doi:10.1577/m02-130

Cited by 20 publications

(9 citation statements)

References 42 publications

(81 reference statements)

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“…Additionally, Stickley et al (1995) found that the abundance of nocturnal-feeding great blue herons was highest under a full moon. They are a large predator with a high energetic demand and are capable of consuming large numbers of salmonids (Hodgens et al 2004). In Lake Sammamish and Lake Washington, great blue herons appear to be common and may take advantage of artificial nighttime lights to forage, especially if aggregations of fish are present.…”

Section: Phototaxic Behavior Of Subyearling Salmonidsmentioning

confidence: 99%

Phototaxic Behavior of Subyearling Salmonids in the Nearshore Area of Two Urban Lakes in Western Washington State

et al. 2017

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We conducted field experiments in the nearshore area of two urban lakes (Lake Washington and Lake Sammamish) in western Washington to test the attractive quality of artificial nighttime lighting to subyearling salmonids Oncorhynchus spp. In both lakes, experimental trials were conducted along a uniform 156‐m shoreline section twice a month (one night with lights and one control night without lights) from March to May to correspond with peak nearshore rearing of subyearling salmonids. We examined the effects of three light intensities on nearshore fish abundance: (1) no light, (2) dim light (maximum, 5.0 lx), and (3) bright light (maximum, 50.0 lx). These were compared with abundances from control nights without light treatments. Beach seining was used to determine fish abundance. For each month, the total number of subyearling salmonids (Chinook Salmon O. tshawytscha, Coho Salmon O. kisutch, and Sockeye Salmon O. nerka combined) was greater on the lighted nights (all treatments combined) than it was on the control nights. In both lakes, the most subyearling salmonids were collected in the bright‐light treatments, an intermediate amount in the dim‐light treatments, and few in the no‐light treatments. In some instances, subyearling salmonid abundances in the bright‐light treatments were more than 10 times greater than in the no‐light treatments. The effect of nighttime artificial lighting was generally more pronounced in March than in April or May. The results support our hypothesis that subyearling salmonids exhibit nocturnal phototaxic behavior when exposed to elevated nighttime lighting. A major concern of artificial nighttime lighting for subyearling salmonids is the potential for an increased predation risk, and we believe the prudent management goal would be to minimize artificial nighttime lighting. Received October 23, 2016; accepted March 7, 2017 Published online May 26, 2017

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Section: Phototaxic Behavior Of Subyearling Salmonidsmentioning

confidence: 99%

Phototaxic Behavior of Subyearling Salmonids in the Nearshore Area of Two Urban Lakes in Western Washington State

et al. 2017

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“…Both species are much more cold-adapted than the native Colorado River fishes, which all have thermal optima of 22-26 C (Bulkley et al 1981;Kappenman et al 2012). Stocking coldwater sport fish such as Rainbow Trout into rivers with native warmwater fishes is common after construction of large hydroelectric dams (Weiland and Hayward 1997;Bettinger and Bettoli 2002;Hodgens et al 2004). Typically, native fish populations are completely replaced by the introduced species (Clarkson et al 2005;Marsh and Pacey 2005), but the case of the Colorado River in the Grand Canyon appears unique in that the introduced coldwater fish and the native warmwater fish are co-existing.…”

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confidence: 99%

Effects of Water Temperature and Fish Size on Predation Vulnerability of Juvenile Humpback Chub to Rainbow Trout and Brown Trout

Ward

Morton-Starner

2015

Trans Am Fish Soc

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Predation on juvenile native fish by introduced Rainbow Trout and Brown Trout is considered a significant threat to the persistence of endangered Humpback Chub Gila cypha in the Colorado River in the Grand Canyon. Diet studies of Rainbow Trout and Brown Trout in Glen and Grand canyons indicate that these species do eat native fish, but impacts are difficult to assess because predation vulnerability is highly variable, depending on prey size, predator size, and the water temperatures under which the predation interactions take place. We conducted laboratory experiments to evaluate how short-term predation vulnerability of juvenile native fish changes in response to fish size and water temperature using captivity-reared Humpback Chub, Bonytail, and Roundtail Chub. Juvenile chub 45-90 mm total length (TL) were exposed to adult Rainbow and Brown trouts at 10, 15, and 20 C to measure predation vulnerability as a function of water temperature and fish size. A 1 C increase in water temperature decreased shortterm predation vulnerability of Humpback Chub to Rainbow Trout by about 5%, although the relationship is not linear. Brown Trout were highly piscivorous in the laboratory at any size > 220 mm TL and at all water temperatures we tested. Understanding the effects of predation by trout on endangered Humpback Chub is critical in evaluating management options aimed at preserving native fishes in Grand Canyon National Park.

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“…and Northern Pike Esox lucius (Carline et al 1986;Hanson et al 1986;Szendrey and Wahl 1996;Wahl et al 2012). Furthermore, Hodgens et al (2004) estimated that a great blue heron population (n = 227) consumed nearly 50,000 catchable-sized Rainbow Trout Oncorhynchus mykiss per year in a stocked Arkansas tailwater fishery; those authors reported that the birds were most successful when feeding in shallow waters (<0.2 m)-habitat that was frequented by juvenile Muskellunge in our study systems.…”

Section: Discussionmentioning

confidence: 77%

Mortality, Dispersal, and Habitat Use of Stocked Juvenile Muskellunge in Two Western North Carolina Rivers

Owensby

Rice

Aday

2017

N American J Fish Manag

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The Muskellunge Esox masquinongy is a highly sought-after sport fish that is native to the Tennessee River drainage of western North Carolina. After the extirpation of Muskellunge from North Carolina in the 1950s, the North Carolina Wildlife Resources Commission began a stocking program to re-establish the species and produce viable Muskellunge fisheries in North Carolina. Although stocking efforts have created a Muskellunge fishery in, for example, the French Broad River (where the species was native), there is little evidence of success in North Carolina sections of the New River (where the species was not native). Possible mechanisms inhibiting stocking success are unclear because there is relatively little information available on the juvenile life stage of the Muskellunge, especially in the southern portion of its distribution. We addressed the perceived differences in recruitment between the two fisheries by using telemetry to investigate dispersal, mortality, and habitat use by stocked juvenile Muskellunge. Fifty hatchery-reared, age-0 Muskellunge (282-307 mm TL) were tagged prior to stocking in the New River (fall 2013) and French Broad River (fall 2014). Three months after stocking, known survival of tagged fish was 4% in the New River and 29% in the French Broad River; the survival probability after 3 months was estimated at 9% (range = 4-17%) in the New River and 37% (range = 25-56%) in the French Broad River. Extended survival in the French Broad River was 14% at 252 d poststocking. High dispersal was observed, with maximum individual dispersal of 67.4 km in the New River and 55.5 km in the French Broad River. Habitat suitability analyses indicated that juvenile Muskellunge in the FBR selected shallow nearshore areas with low water velocity, fine substrate, and substantial cover in the form of woody debris and overhanging vegetation. Information on the survival and behavior of stocked Muskellunge can facilitate efforts to successfully manage these fisheries.

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Great Blue Heron Predation on Stocked Rainbow Trout in an Arkansas Tailwater Fishery

Cited by 20 publications

References 42 publications

Phototaxic Behavior of Subyearling Salmonids in the Nearshore Area of Two Urban Lakes in Western Washington State

Phototaxic Behavior of Subyearling Salmonids in the Nearshore Area of Two Urban Lakes in Western Washington State

Effects of Water Temperature and Fish Size on Predation Vulnerability of Juvenile Humpback Chub to Rainbow Trout and Brown Trout

Mortality, Dispersal, and Habitat Use of Stocked Juvenile Muskellunge in Two Western North Carolina Rivers

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