Retention of passive integrated transponder tags in hatchery brook trout: Effect of tag size, implantation site, and double tagging

Peterson, Douglas P.; Twibell, Ronald G.; Piteo, Matthew S.

doi:10.1111/fme.12616

Cited by 2 publications

(1 citation statement)

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“…However, the application of this methodology requires skilled and trained labor for its execution [ 70 , 71 ]. There is also the cost associated with PITs [ 72 , 73 ], which are more expensive and require handheld scanners, and all groups in the area need to possess handheld scanners to identify individuals. In comparison, flipper tags are easily readable by other groups, fishermen, and the general public, while PIT tags restrict the future recording of data beyond the nesting beach [ 74 ].…”

Section: Discussionmentioning

confidence: 99%

Nesting Ecology of Lepidochelys olivacea in Lobito, Angola

Ferreira,

Murillo,

Le-Corre

et al. 2023

MPs

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The scarcity on the Atlantic coast of the African sea turtle population and its dynamics data is well known. This article discusses the nesting ecology methods and analysis of a nascent Angolan project aimed at preserving the nesting female population of the Olive Ridley turtle (Lepidochelys olivacea) on the coast of Lobito. This study examines the nesting ecology of this species from 2020 to 2023. Females had an average CCL of 70.2 cm and CCW of 68.5 cm. These females laid 127 eggs in nests that averaged 47.0 cm deep. The ex situ nest incubation period averaged 60 days, and the hatchling success was 82.1%. Some techniques used in this project require modifications and enhancements. The utilization of photo identification did not yield the anticipated outcomes, prompting the adoption of passive integrated transponders (PITs) in the last season. However, due to limited funding, the success of this method is contingent upon an augmented field effort, allowing for the recapture of a larger number of females. The continuity of this project hinges upon collaboration between higher authorities and the local community. Together, it is possible to deepen the understanding of the nesting ecology of this species and address pivotal issues for its conservation, thereby implementing the most effective preservation measures.

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Section: Discussionmentioning

confidence: 99%

Nesting Ecology of Lepidochelys olivacea in Lobito, Angola

Ferreira,

Murillo,

Le-Corre

et al. 2023

MPs

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Rates of PIT tag ingestion and gastric retention in three species of hatchery‐reared salmonids and potential implications for postrelease monitoring

Hemeon,

Peterson,

Twibell

et al. 2024

N American J Fish Manag

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ObjectiveThe current laboratory study was conducted to better quantify ingestion rates of shed passive integrated transponder (PIT) tags by hatchery‐reared Pacific salmon Oncorhynchus spp. during captive rearing, whether this phenomenon exists among salmonid species, how long ingested tags are retained, and whether tag ingestion affects survival and growth.MethodsPassive integrated transponder tag ingestion rates were obtained for steelhead O. mykiss, Coho Salmon O. kisutch, and spring Chinook Salmon O. tshawytscha by exposing fish to loose PIT tags as a proxy for shed tags. Fish that volitionally ingested shed tags were monitored for the effect of ingested tags on individual growth, and time to tag expulsion was determined to estimate the probability of individual tag retention over time. The potential for tag collision between an ingested and implanted tag was evaluated using a three‐antenna array.ResultCoho Salmon and steelhead ingested 51% and 69% of available PIT tags, respectively, in two separate week‐long trials. Chinook Salmon did not volitionally ingest tags. Steelhead were estimated to expel ingested tags faster (50% probability of expulsion within 5 days) than Coho Salmon (50% probability of expulsion within 51 days) and Chinook Salmon (gastrically implanted tags; 50% probability of expulsion within 22 days). Across all species, 20–27% of ingested tags were retained for at least 230 days with no apparent effect on survival. Growth rates of Coho Salmon and steelhead that ingested tags were not significantly different from control fish by the end of the study. Tag detection trials used to evaluate tag collision between an ingested and an implanted PIT tag resulted in reduced implanted tag detection by 94% and reduced ingested tag detection by 85% when both tags were present within the body of a smolt‐sized salmonid.ConclusionBiologists and managers should be aware of how tag ingestion by hatchery salmonids can not only complicate the estimation of tag retention, but also cause tag collisions or the misidentification of individual fish during postrelease monitoring.

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Retention of passive integrated transponder tags in hatchery brook trout: Effect of tag size, implantation site, and double tagging

Abstract: Individual marking or tagging of organisms has increased knowledge of biology and spatial ecology of numerous species, which is essential for effective fish and wildlife management and conser-

Cited by 2 publications

References 93 publications

Nesting Ecology of Lepidochelys olivacea in Lobito, Angola

Nesting Ecology of Lepidochelys olivacea in Lobito, Angola

Rates of PIT tag ingestion and gastric retention in three species of hatchery‐reared salmonids and potential implications for postrelease monitoring

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