Brown Trout in Argentina

Casalinuovo, Miguel; Alonso, Marcelo F.; Macchi, Patricio J.; Kuroda, Jorge A.

doi:10.1002/9781119268352.ch23

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…zebra among the synchronous group, with the spawning season varying from autumn to spring. This spawning season concurs with S. trutta spawning season at Patagonia, usually from May to September (Casalinuovo et al, 2017). We did not find YOYs or juveniles of A. zebra, showing a minimal abundance of these fish in the area and possibly a more successful development and growth for S. trutta.…”

Section: Discussionsupporting

confidence: 82%

Ecological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact

Bahamonde,

Chiang,

Mancilla

et al. 2023

Journal of Fish Biology

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Salmonids were first introduced into the Chilean fresh waters in the 1880s, and c. 140 years later, they are ubiquitous across Chilean rivers, especially in the southern pristine fresh waters. This study examined the brown trout (Salmo trutta) and native taxa ecology in two adjacent but contrasting rivers of Chilean Patagonia. During spring 2016 and spring–fall 2017 we examined the variation in benthic macroinvertebrate and fish community composition and characterized fish size structure, stomach contents, and stable isotopes (δ13C and δ15N) to understand population structure, fish diet, and trophic interactions between S. trutta and native taxa. The native Galaxias maculatus (puye) dominated the fish community (74% of abundance). S. trutta was less abundant (16% of survey catch) but dominated the fish community (over 53%) in terms of biomass. S. trutta showed distinct diets (stomach content analysis) in the two rivers, and individuals from the larger river were notably more piscivorous, consuming native fish with a relatively small body size (<100‐mm total length). Native fishes were isotopically distinct from S. trutta, which showed a wider isotopic niche in the smaller river, indicating that their trophic role was more variable than in the larger river (piscivorous). This study provides data from the unstudied pristine coastal rivers in Patagonia and reveals that interactions between native and introduced species can vary at very local spatial scales.

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Section: Discussionsupporting

confidence: 82%

Ecological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact

Bahamonde,

Chiang,

Mancilla

et al. 2023

Journal of Fish Biology

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“…The much lower representation of these small fish in the upper sections used by mature fish suggests that they may be nonreproductive trout that overwinter in the lower river. This result is consistent with those of a radio‐tracking study conducted in the Grande River where trout tagged later in the season were smaller and remained mostly in the lower reaches of the river (Casalinuovo et al ., 2018). The negative relationship between the time of river entry and fish length or sea age has been reported before for S. trutta (Jonsson & Gravem, 1985) and S. salar (Jonsson et al ., 1990; Trepanier et al ., 1996; Jokikokko et al ., 2004; Quinn et al ., 2006a; Borgstrøm et al ., 2010) elsewhere.…”

Section: Discussionmentioning

confidence: 99%

“…The southernmost populations, found in the Gallegos River, the Grande River and other Atlantic rivers of Tierra del Fuego, have developed an anadromous cycle (called sea trout), with high marine growth that sustain important sport fisheries. The Grande River is the most important sea trout fishery in Argentina and it is usually considered by fishermen and international fishing magazines as the premier sea trout river in the world (Simpson, 2003; Purnell, 2016; Casalinuovo et al ., 2018), with an annual catch of well over 5000 fish (O'Neal & Stanford, 2011). Within the Argentinean sector, catches take place mainly in six fishing lodges located along 70 km of the river that operate under a ‘catch and release’ system.…”

Section: Methodsmentioning

confidence: 99%

“…The Grande River is the most important sea trout fishery in Argentina and it is usually considered by fishermen and international fishing magazines as the premier sea trout river in the world (Simpson, 2003;Purnell, 2016;Casalinuovo et al, 2018), with an annual catch of well over 5000 fish (O'Neal & Stanford, 2011). Within the Argentinean sector, catches take place mainly in six fishing lodges located along 70 km of the river that operate under a 'catch and release' system.…”

Section: Study Systemmentioning

confidence: 99%

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Surfing the tide: Homeward migration of sea trout (Salmo trutta) in aPatagonian river

Giese

García-Asorey

Casalinuovo³

et al. 2022

Journal of Fish Biology

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This study evaluates the influence of marine and freshwater conditions on the timing of river entry and upstream migration of sea trout (Salmo trutta) in the Grande River of Tierra del Fuego, Patagonia. We analysed the in‐river catch‐and‐release records from a group of fishing lodges that dominate the Grande River fishery during January–April 2008 (n = 5029 fish) as a function of environmental variables: tidal amplitude, stage in the lunar cycle, river discharge, and river water temperature along the homeward migration season. We discuss the value of the daily catch rate as an abundance index in the Grande river, then analyse the temporal structure of the tidal cycle in the Grande River estuary, a macro‐tidal environment with a mean tidal amplitude of 5.7 m, and analyse the fit of a generalized additive model to trout catches on a daily basis in four sections along the river to identify the environmental variables that may affect trout abundance throughout the homeward migration. Fish catches in each section of the river were differentially affected by specific environmental variables: tidal amplitude had a positive and significant effect on catches in the lower river sections, whereas water temperature and river discharge significantly affected catches in upper sections (positive effect of temperature; negative effect of discharge). Catches in the lower section clearly reflect the river entry stage of the homeward migration, with a bi‐modal shape significantly correlated with the tidal cycle. The first peak was composed mainly of larger multi‐sea‐winter trout that move upstream, whereas the second one had a wider range of fish lengths, including a large proportion of small and maybe nonreproductive trout that overwinter in the lower river. Based on our results, we conclude that the large tides in the Grande River estuary strongly affect the river entry timing of sea trout. The underlying mechanisms of this effect may be a combination of increased olfactory recognition and increased tidal transport modulated by the seasonal tidal cycle, which operates on trout during coastal migration to produce the pulses observed in the Grande River sea trout run. In the middle and upper sections of the river, where the tidal effect at river entry was dissipated as upstream migration progressed, trout catches increased with water temperature and decreased with river discharge, which may operate through their influence on in‐river migration rate and abundance, but also through changes in catchability.

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“…Brown trout have been identified as one of the most invasive fish species, interacting with salmonids and native fishes in portions of North America, South America, Europe, New Zealand and other regions of the world (e.g. Budy & Gaeta, 2018;Casalinuovo, Alonso, Macchi, & Kuroda, 2018;Jones & Closs, 2018). The potential for negative effects of brown trout on native salmonid species has led to consideration or use of dams as management tools for isolating upstream populations of native salmonids from downstream non-native populations (Fausch, Rieman, Dunham, Young, & Peterson, 2009;Rahel, 2013;Kirk, Rosswog, Ressel, & Wissinger, 2018).…”

Section: Introductionmentioning

confidence: 99%

Increasing connectivity of Great Lakes tributaries: Interspecific and intraspecific effects on resident brook trout and brown trout populations

Zorn

Hessenauer

Wills

2020

Ecology of Freshwater Fish

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Understanding resident fish population responses to restored connectivity would enhance decision‐making on dam removal and fish passage. Since such evaluations are limited in the Great Lakes region of North America, we compared abundance, survival, and growth of resident brook trout and brown trout between sets of Michigan streams where populations were or were not interacting with salmonid species that might be present if connectivity existed. We analysed data from 34 electrofishing index sites to compare resident trout populations between streams without versus with Great Lakes access (and migratory Pacific salmonids), and brook trout populations in Great Lakes inaccessible (land‐locked) streams where brown trout were present versus absent. Great Lakes accessibility effects on fish density became increasingly positive for older age groups of brown trout while generally negative for all age classes of brook trout. Brown trout had consistently negative effects on brook trout density in land‐locked streams. Increased connectivity had significant effects on annual survival for only one of seven trout age classes modelled, while intraspecific density‐dependent effects on survival were significant in six models. Significant intraspecific effects on resident trout growth occurred for seven of eleven age classes examined. Negative interspecific effects of Great Lakes access on resident trout growth were most noticeable for age‐0 and age‐1 resident trout, age classes that likely compete with juvenile Pacific salmonids. Our findings provide a more robust understanding of how Great Lakes connectivity affects resident trout populations, highlighting negative influences of brown trout on brook trout and intraspecific density‐dependent effects.

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Brown Trout in Argentina

Cited by 8 publications

References 28 publications

Ecological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact

Ecological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact

Surfing the tide: Homeward migration of sea trout (Salmo trutta) in aPatagonian river

Increasing connectivity of Great Lakes tributaries: Interspecific and intraspecific effects on resident brook trout and brown trout populations

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