Long‐term retention of dummy acoustic transmitters in adult brown trout

Kennedy, Richard; Evans, Donald M.; Allen, M.

doi:10.1111/jfb.14498

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Tagged fish that were detected actively moving around the lake arrays by the time of tag battery expiry were assumed to be alive. It is possible that some fish may have remained alive but were not actively moving or detected on the lake arrays, and some fish may have expelled their tags (Kennedy et al ., 2020); therefore these data were taken only as a proxy for minimum survival rates in the lake.…”

Section: Methodsmentioning

confidence: 99%

Investigating the phenology of juvenile potamodromous brown trout (Salmo trutta L.) in two large lake catchments

Kennedy¹,

Rosell

Allen

2022

Journal of Fish Biology

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There is growing interest in the phenology of juvenile Salmo trutta and evidence of significant downstream migration during the autumn in some anadromous populations. The present study used acoustic telemetry to examine the phenology of potamodromous trout parr across a region encompassing two large lake catchments. One hundred sixty‐seven trout parr were tagged in late summer across four lake tributaries between 2018 and 2020. In total, 75 tagged parr migrated into the lakes with 67 (89%) migrating between September and December and 8 (11%) migrating between March and June. Autumn migration was highly prevalent across all the tributaries, with 16%–66% of each tagged sample exhibiting autumn migration, and 0%–15% of each tagged sample exhibiting spring migration. Autumn migrants were significantly longer and heavier than spring migrants, but condition factor was similar. Autumn migrants were associated with higher river discharge levels and lower water temperatures than spring migrants. The management challenges posed by extensive autumn migration behaviour in migratory trout stocks are examined and discussed.

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Section: Methodsmentioning

confidence: 99%

Investigating the phenology of juvenile potamodromous brown trout (Salmo trutta L.) in two large lake catchments

Kennedy¹,

Rosell

Allen

2022

Journal of Fish Biology

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“…While differences in life histories, morphology, and behavior may deem some approaches inapplicable to marine turtles, there is much to gain from reviewing studies from fields where acoustic telemetry has been more widely utilized, such as fisheries (see reviews: Heupel and Webber, 2012;Donaldson et al, 2014;Hussey et al, 2015;Matley et al, 2021b). Currently, one of the main limitations to marine turtle acoustic studies is that transmitters are applied externally, which reduces the retention time compared to transmitters surgically implanted in fish and shark species (Smith et al, 2019;Smukall et al, 2019;Kennedy et al, 2020). Although marine turtle transmitter retention varies by species, the longest recorded duration (hawksbill) was just under 4 years (Chevis et al, 2017;Smith et al, 2019).…”

Section: Future Directionsmentioning

confidence: 99%

A Systematic Review of Acoustic Telemetry as a Tool to Gain Insights Into Marine Turtle Ecology and Aid Their Conservation

Hardin

Fuentes

2021

Front. Mar. Sci.

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While widely applied in fisheries science, acoustic telemetry remains an underutilized method in the field of marine turtle biotelemetry. However, with the ability to provide fine-scale spatial data (tens to hundreds of meters, depending on array setup and receiver range) at a low cost, acoustic telemetry presents an important tool for obtaining key information on marine turtle ecology. We present a comprehensive and systematic review acknowledging how acoustic telemetry has been used to advance the field of marine turtle ecology and conservation. We identify the extent of current studies and discuss common and novel research approaches while addressing specific limitations of acoustic telemetry. Forty-eight studies were reviewed, representing six of the seven marine turtle species and all life stages, with most individuals identified as juveniles (45%) and hatchlings (36%). Most studies (83%) focused on the spatial distribution of marine turtles, including estimating home ranges, investigating drivers of habitat use, and identifying horizontal movement patterns and vertical space use. Additionally, acoustic telemetry has been used to study hatchling dispersal and marine turtle exposure and response to threats, as well as to monitor physiological parameters. We identified that acoustic telemetry directly or indirectly informs 60% of the top questions and research priorities related to marine turtles identified by experts in the field. With an increase in acoustic telemetry receiver networks and collaborations across taxa, the applicability of acoustic telemetry is growing, not only for marine turtles but for a wide array of marine species. Although there are limitations that need to be considered at a site/project-level, acoustic telemetry is an important, low-cost technology able to address key questions related to marine turtle ecology that can aid in their conservation, and therefore should be considered by researchers as they develop their projects.

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“…The acoustic telemetry work also provides an important enhancement to the overall survival assessments by accounting for potential smolt losses in the lower river below the smolt trap (Flávio et al, 2019) and thus refining the estimates of true marine survival. It should be noted that tag retention is an important consideration for long-term telemetry studies (Kennedy et al, 2020) and previous work on S. salar smolts has indicated c. 20% long-term expulsion rate of similar-sized dummy tags (Brundson et al, 2019). Consequently, the survival estimates generated in the current study should be treated as minimum estimates.…”

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confidence: 99%

Programmed acoustic tags reveal novel information on late‐phase marine life in Atlantic salmon, Salmo salar

Kennedy

Rosell

Hunter

et al. 2022

Journal of Fish Biology

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This pilot study used programmed acoustic tags implanted into Salmo salar smolts, in conjunction with an extensive offshore marine receiver array, to investigate late‐stage migratory behaviour and survival of returning adult salmon. A total of 100 smolts were tagged in 2020, and a number of individuals were successfully detected as returning adults in 2021. After detection efficiency was accounted for, 5–9 adults were estimated to have returned to the offshore array c. 45 km from the river mouth. A total of three fish were subsequently detected in the river. Losses of between 40% and 66% were evident during the final stages of ocean migration, and one tagged fish provided direct evidence of a predation event.

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Long‐term retention of dummy acoustic transmitters in adult brown trout

Cited by 8 publications

References 23 publications

Investigating the phenology of juvenile potamodromous brown trout (Salmo trutta L.) in two large lake catchments

Investigating the phenology of juvenile potamodromous brown trout (Salmo trutta L.) in two large lake catchments

A Systematic Review of Acoustic Telemetry as a Tool to Gain Insights Into Marine Turtle Ecology and Aid Their Conservation

Programmed acoustic tags reveal novel information on late‐phase marine life in Atlantic salmon, Salmo salar

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