Potential Impacts of PIT Tagging on a Critically Endangered Small-Bodied Fish; A Trial on the Surrogate Mountain Galaxias

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Abstract

Recent advances in PIT technology have led to smaller tags, meaning that this technology can be used to mark and monitor smaller-bodied species, many of which are threatened. We examined the effects of 9-mm PIT tags on the survival and growth of the Mountain Galaxias Galaxias olidus, using this fish as a surrogate for several threatened, small-bodied galaxiids. We measured survival, growth, and tag retention in 34 tagged and 34 untagged fish held in aquaria for 90 d posttagging. Fish were randomly assigned to a treatment (tagged or untagged) and were weighed just prior to tagging and then at 7, 14, 21, 28, 42, and 90 d after tagging, with observations made 5–7 times per week to check for survival and tag loss. Survival did not differ significantly between tagged and untagged groups (79% and 88%, respectively), and there was no difference in weight gain or loss between the two groups over time. Tag retention rate was high (96%), with only one tag expelled by the smallest tagged fish (73 mm length to caudal fork). Our findings show that Mountain Galaxias are capable of successfully retaining 9-mm PIT tags in aquarium conditions, suggesting that this technology is suitable for the monitoring of similar small-bodied fish in the wild.

Original languageEnglish
Pages (from-to)1078-1084
Number of pages7
JournalTransactions of the American Fisheries Society
Volume147
Issue number6
DOIs
Publication statusPublished - Nov 2018

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tagging
mountain
fish
aquariums
aquarium
Galaxiidae
monitoring
wild fish
weight loss
weight gain
trial
Galaxias olidus
loss

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title = "Potential Impacts of PIT Tagging on a Critically Endangered Small-Bodied Fish; A Trial on the Surrogate Mountain Galaxias",
abstract = "Recent advances in PIT technology have led to smaller tags, meaning that this technology can be used to mark and monitor smaller-bodied species, many of which are threatened. We examined the effects of 9-mm PIT tags on the survival and growth of the Mountain Galaxias Galaxias olidus, using this fish as a surrogate for several threatened, small-bodied galaxiids. We measured survival, growth, and tag retention in 34 tagged and 34 untagged fish held in aquaria for 90 d posttagging. Fish were randomly assigned to a treatment (tagged or untagged) and were weighed just prior to tagging and then at 7, 14, 21, 28, 42, and 90 d after tagging, with observations made 5–7 times per week to check for survival and tag loss. Survival did not differ significantly between tagged and untagged groups (79{\%} and 88{\%}, respectively), and there was no difference in weight gain or loss between the two groups over time. Tag retention rate was high (96{\%}), with only one tag expelled by the smallest tagged fish (73 mm length to caudal fork). Our findings show that Mountain Galaxias are capable of successfully retaining 9-mm PIT tags in aquarium conditions, suggesting that this technology is suitable for the monitoring of similar small-bodied fish in the wild.",
author = "Hugh Allan and Peter Unmack and Duncan, {Richard P.} and Mark Lintermans",
year = "2018",
month = "11",
doi = "10.1002/tafs.10102",
language = "English",
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pages = "1078--1084",
journal = "Transactions of the American Fisheries Society",
issn = "0002-8487",
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T1 - Potential Impacts of PIT Tagging on a Critically Endangered Small-Bodied Fish; A Trial on the Surrogate Mountain Galaxias

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AU - Duncan, Richard P.

AU - Lintermans, Mark

PY - 2018/11

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AB - Recent advances in PIT technology have led to smaller tags, meaning that this technology can be used to mark and monitor smaller-bodied species, many of which are threatened. We examined the effects of 9-mm PIT tags on the survival and growth of the Mountain Galaxias Galaxias olidus, using this fish as a surrogate for several threatened, small-bodied galaxiids. We measured survival, growth, and tag retention in 34 tagged and 34 untagged fish held in aquaria for 90 d posttagging. Fish were randomly assigned to a treatment (tagged or untagged) and were weighed just prior to tagging and then at 7, 14, 21, 28, 42, and 90 d after tagging, with observations made 5–7 times per week to check for survival and tag loss. Survival did not differ significantly between tagged and untagged groups (79% and 88%, respectively), and there was no difference in weight gain or loss between the two groups over time. Tag retention rate was high (96%), with only one tag expelled by the smallest tagged fish (73 mm length to caudal fork). Our findings show that Mountain Galaxias are capable of successfully retaining 9-mm PIT tags in aquarium conditions, suggesting that this technology is suitable for the monitoring of similar small-bodied fish in the wild.

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