Feeding periodicity, diet composition, and food consumption of subyearling rainbow trout in winter

Johnson, James H.; Chalupnicki, Marc A.; Abbett, Ross

doi:10.1007/s10641-016-0521-x

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…Studies of salmonids have also reported foraging during moonlit nights and nocturnal activity during winter, or have inferred nocturnal foraging based on increases in stomach contents during nighttime, indicating that salmonids can feed during low-light periods (Jenkins 1969;Cunjak 1988;Metcalfe et al 1999;Johnson et al 2016). While our data did reveal that Yellowstone Cutthroat Trout make foraging attempts in darkness, the low frequency, higher rejection rate, and shorter distances moved to forage indicate that they are not very effective predators at night.…”

Section: Discussioncontrasting

confidence: 47%

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Quantifying the Foodscape for Stream‐Dwelling Cutthroat Trout Reveals Spatial and Temporal Ranges of Resource Exploitation and Energy Intake

Owens

Keeley

2022

Trans Am Fish Soc

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Food availability is a primary factor limiting the abundance of wild populations, but quantifying it requires an understanding of when and where prey are vulnerable to predators. Salmonid fishes in streams are commonly thought to forage on drifting aquatic invertebrates during daylight hours. However, past studies also report benthic and nocturnal foraging despite the predominant view of salmonids as diurnal drift‐feeding predators. We used instream videography to assess foraging mode and energy intake for stream‐dwelling Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. We recorded the foraging behavior of wild fish with a waterproof video camera and estimated energy intake based on fish size, foraging rate, retention rate, and caloric values of prey. Fish captured prey primarily from the water column and surface, targeting drifting invertebrates during daytime hours; however, they also foraged from the stream benthos and during nighttime. Yellowstone Cutthroat Trout foraging rate was most strongly related to foraging location in the stream, diel period, and month. Energy intake was highest from daytime drift‐foraging behavior and exceeded a modeled metabolic limit of food intake during October and November. Nocturnal and benthic foraging contributed the smallest proportion of total foraging attempts but was observed over all months of our study and sometimes comprised up to 30% of estimated energy intake. Our results indicate that Yellowstone Cutthroat Trout in streams acquire most of the food intake as daytime drift‐feeding predators.

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Section: Discussioncontrasting

confidence: 47%

“…1999; Johnson et al. 2016). While our data did reveal that Yellowstone Cutthroat Trout make foraging attempts in darkness, the low frequency, higher rejection rate, and shorter distances moved to forage indicate that they are not very effective predators at night.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the Foodscape for Stream‐Dwelling Cutthroat Trout Reveals Spatial and Temporal Ranges of Resource Exploitation and Energy Intake

Owens

Keeley

2022

Trans Am Fish Soc

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“…Less information is available on prey selection of Atlantic salmon parr and rainbow trout parr compared to brown trout parr. Erkinaro and Erkinaro () and Johnson, Chalupnicki, and Abbett () both reported strong selection for chironomids whereas Coghlan, Connerton, Ringler, Stewart, and Mead () found neutral selection by Atlantic salmon. Dedual and Collier () and Coghlan et al.…”

Section: Discussionmentioning

confidence: 99%

Comparative diets and foraging strategies of subyearling Atlantic salmon, brown trout, and rainbow trout during winter

et al. 2017

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Summary Over‐winter survival of salmonids in streams is thought to be an important population regulation mechanism. Yet because of the difficulty of conducting field studies due to adverse weather or ice conditions, compared to other seasons, salmonid ecology during winter is least understood. Consequently, we sought to examine interspecific feeding associations of an important salmonid stream assemblage in the Lake Ontario watershed during winter. The diets of Atlantic salmon (Salmo salar) parr, brown trout (S. trutta) parr, and rainbow trout (Oncorhynchus mykiss) parr were significantly different in February but not in March. Salmonid diets differed from the benthos and the drift during both months. Dipterans (chironomids, simuliids, and tipulids) and ephemerellids were the major prey taxa consumed. All three species fed more heavily on prey items from the benthos than from the drift. The diet of Atlantic salmon had the highest similarity to the benthos whereas the diet of brown trout had the lowest similarity to the drift. All three salmonid species generally selected ephemerellids, limnephilids, and chironomids and avoided elmids. These winter feeding observations are the first reported for this specific salmonid assemblage and will help managers better understand interspecific associations during this critical period.

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Distinct diel and seasonal behaviours in rainbow trout detected by fine-scale acoustic telemetry in a lake environment

Watson

Biagi

Northrup

et al. 2019

Can. J. Fish. Aquat. Sci.

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The fine-scale behavioural activities of rainbow trout (Oncorhynchus mykiss) in nature are not well understood, but are of importance for identifying interactions with the ecosystem and of interest to conservationists and recreational anglers. We have undertaken a high-resolution acoustic telemetry study to identify the distinct movement patterns of 30 rainbow trout in a freshwater lake, specifically examining swim speed, area of movement, and site preference in both summer and winter. Activity levels were reduced in winter compared with summer across all fish, but ranking of individuals was consistent. In summer, 16/30 fish displayed diel movement, in which they travelled to a different area of the lake at dawn and returned at dusk, while other fish maintained their site preference regardless of the time of day or swam more randomly throughout the lake. These patterns were minimized in winter, where there was a reduction in cross-lake movement under ice and only 4/30 fish displayed diel movement. Winter conditions may limit the capability (physiological limitations) and (or) motivation (prey availability) for diel behaviours observed in summer.

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Feeding periodicity, diet composition, and food consumption of subyearling rainbow trout in winter

Cited by 3 publications

References 31 publications

Quantifying the Foodscape for Stream‐Dwelling Cutthroat Trout Reveals Spatial and Temporal Ranges of Resource Exploitation and Energy Intake

Quantifying the Foodscape for Stream‐Dwelling Cutthroat Trout Reveals Spatial and Temporal Ranges of Resource Exploitation and Energy Intake

Comparative diets and foraging strategies of subyearling Atlantic salmon, brown trout, and rainbow trout during winter

Distinct diel and seasonal behaviours in rainbow trout detected by fine-scale acoustic telemetry in a lake environment

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