Impact of trapping and tagging on the timing of continued seaward migration of wild Atlantic salmon, <i>Salmo salar</i>, smolts

Riley, W. D.; Moore, A. M.; Russell, I. C.; Davidson, Ian; Cove, Richard J.; Ives, M. J.

doi:10.1111/j.1365-2400.2007.00542.x

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…Finally, it is interesting to note that in the order of 60–70% of the smolts left the lake during night‐time (the 7 h from 2200 to 04:59 hours), indicating that measures would be most effective when implemented at night. The pattern of predominately nocturnal migration of S. salar smolt has been repeatedly shown (Hvidsten et al , 1995; Olsén et al , 2004; Riley et al , 2007), with notable exceptions at high temperatures (Moore et al , 1995; Ibbotson et al , 2006) and at high latitudes with midnight sun (Davidsen et al , 2005).…”

Section: Discussionmentioning

confidence: 78%

A concept for improving Atlantic salmon Salmo salar smolt migration past hydro power intakes

Fjeldstad

Uglem

Diserud

et al. 2012

Journal of Fish Biology

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In this study, cost effective (in terms of reducing loss of power production) measures for increasing bypass migration of Atlantic salmon Salmo salar were developed and tested by establishing statistical models for timing of smolt migration and favourable diversion of water to the bypass. Initial tracking of radio-tagged smolts showed very low bypass migration under normal hydropower operations. Bypass migration increased when bypass discharge was experimentally increased and a model was developed that described relationships between total river discharge, bypass diversion and smolt migration route. Further improvements were obtained by installing two strobe lights at the power-production tunnel entrance that increased bypass migration during the night, but not during daytime. According to the behaviour of radio-tagged fish, the implemented measures contributed to increasing the annual percentage of bypass migration from 11 to 64%, and according to model predictions to 60-74% when the hydropower facilities were operated according to the developed models. To ensure correct timing of discharge diversion a smolt migration model was developed based on environmental variables that could successfully predict the general pattern of migration timing. The concept presented for improving smolt migration past hydropower intakes should be applicable in many systems where migration past hydropower installations cannot easily be solved by screening systems.

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Section: Discussionmentioning

confidence: 78%

A concept for improving Atlantic salmon Salmo salar smolt migration past hydro power intakes

Fjeldstad

Uglem

Diserud

et al. 2012

Journal of Fish Biology

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“…It could be that subsequent migratory behaviour (Riley et al . , ) or physiology (N. Lower, W. D. Riley, T. Ellis, & A. Moore, unpubl. data) of tagged smolts released at night is different to those released during the day and this might affect their ability to avoid predators.…”

Section: Discussionmentioning

confidence: 99%

“…However, it has been reported that such techniques may have a negative effect on smolt physiology, behaviour and survival (Hansen, ; Hansen & Jonsson, ; Moffett et al ., ; Riley et al . , ; N. Lower, W. D. Riley, T. Ellis, & A. Moore, unpubl. data).…”

Section: Introductionmentioning

confidence: 99%

“…The capture and tagging of migrating wild smolts and an assessment of the subsequent return of this tagged cohort as adults is widely used to derive these return rate estimates. However, it has been reported that such techniques may have a negative effect on smolt physiology, behaviour and survival (Hansen, 1988;Hansen & Jonsson, 1988;Moffett et al, 1997;Riley et al, 2007;N. Lower, W. D. Riley, T. Ellis, & A. Moore, unpubl.…”

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confidence: 99%

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Under what circumstances does the capture and tagging of wild Atlantic salmon Salmo salar smolts affect probability of return as adults?

Riley

Ibbotson

Gregory

et al. 2018

Journal of Fish Biology

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Adult return rates for wild Atlantic salmon Salmo salar smolts captured in a rotary screw trap and tagged with coded wire (CW) tags were compared with a control group, using detections from passive integrated transponder (PIT) antennae systems over 7 years in a small chalk stream in southern England, U.K. Compared with control smolts, capture and CW-tagging of experimental smolts affected detected return rates only under certain conditions, with a decreased return probability for smolts caught and tagged following mild winter river temperature anomalies and during the night. Similarly, analysis of the experimental smolts revealed that capture and CW-tagging following mild winters decreased their probability of return as adults. There were also marginal positive effects of length at PIT-tagging as parr and length at CW-tagging as smolts, on individual probability of return as adult. The results support the hypothesis that the effect of procedures involving the capture and tagging of migrating wild S. salar smolts will vary with the circumstances under which they are performed. The implications of the findings are considered in the context of ongoing investigations to derive and report marine return rates for S. salar in support of national and international stock assessments and in developing best practice.

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“…High levels (41%) of olfactory nerve damage from CWTs have been identified in Chum Salmon Oncorhynchus keta that were tagged in the snout, potentially affecting their homing capabilities (Morrison and Zajac 1987). Snout-tagged Atlantic Salmon smolts may experience delayed migration (Riley et al 2007), and adult return rates may be lower than in untagged groups (Crozier and Kennedy 2002). Tagging fish with CWTs in body locations should alleviate these concerns.…”

Section: Discussionmentioning

confidence: 99%

Nonlethal Batch Identification of Atlantic Salmon Using Coded Wire Tags

Goulette

Lipsky

2016

N American J Fish Manag

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Hatchery fish are a valuable asset to and often an essential component of endangered species recovery programs. The recovery program for Atlantic Salmon Salmo salar in the Penobscot River, Maine, uses multiple life stages of hatchery fish. Correct identification of returning adults is vital to assess the contribution of each stocked life stage to overall Atlantic Salmon returns. We investigated the use of coded wire tags (CWTs) implanted into various body locations of salmon parr to determine whether the tags could be used as a nonlethal batch identifier after recapture. We tagged 200 (four groups of ~50) Atlantic Salmon parr with CWTs in four different anatomical locations (right and left dorsal and right and left adipose areas) using a Northwest Marine Technology (NMT) handheld multishot injector. We used an additional 51 nontagged parr as a control. We examined fish for CWTs using a NMT blue handheld wand and kept track of individuals using PIT tags. We monitored CWT recovery, correct identification of CWT location, growth rates for all tagged groups, and growth rates for the control group. Tag recovery was 94.7% at 28 months posttagging. Correct identification of CWT location improved with each sampling event to 88.3% at 28 months. Tag location did not affect growth rates, but we found a significant difference between tag location and tag recovery. The left dorsal and left adipose areas had the highest recovery rates. Tagging fish in different anatomical locations with CWTs can provide a minimally invasive batch mark when benign recovery is desired. Received June 16, 2015; accepted May 25, 2016 Published online August 30, 2016

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Impact of trapping and tagging on the timing of continued seaward migration of wild Atlantic salmon, Salmo salar, smolts

Cited by 7 publications

References 19 publications

A concept for improving Atlantic salmon Salmo salar smolt migration past hydro power intakes

A concept for improving Atlantic salmon Salmo salar smolt migration past hydro power intakes

Under what circumstances does the capture and tagging of wild Atlantic salmon Salmo salar smolts affect probability of return as adults?

Nonlethal Batch Identification of Atlantic Salmon Using Coded Wire Tags

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