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36. From 95 to 59 millimetres: a new active acoustic tag size guideline for salmon

Author

Liss, Stephanie A., Znotinas, Katherine R., Blackburn, Shannon E., Fischer, Eric S., Hughes, James S., Harnish, Ryan A., Li, Huidong, and Deng, Zhiqun Daniel

Subjects
Salmon -- Growth, Animal marking -- Methods -- Analysis, Company growth, Earth sciences
Abstract

Two laboratory studies evaluated small Chinook salmon (Oncorhynchus tshawytscha) (36-99 mm fork length (FL), 0.7%-26.7% tag burden) survival, tag retention, and growth (n = 539) and critical swimming speed ([U.sub.crit]; n = 241). Fish were implanted with a new active acoustic tag and compared with untagged controls at 12 and 17 [degrees]C. Across studies, no temperature differences were detected. All control fish survived. All tagged fish [greater than or equal to] 58 mm FL survived and retained their tags. Regression models predicted [greater than or equal to] 98.6% survival and retention for tagged fish [greater than or equal to] 58.6 mm FL or [greater than or equal to] 1.9 g (4.2% tag burden). No growth differences among treatments were identified. Spline regression analysis indicated [U.sub.crit] was similar for control and tagged fish that measured [greater than or equal to] 57.3 mm FL. We recommend tagging salmon [greater than or equal to] 59 mm FL or [greater than or equal to] 1.9 g ([less than or equal to] 4.2% tag burden), although the guideline should be confirmed in a field setting. Study results represent an important step towards using the new active tag in acoustic telemetry field studies that estimate short-term (30-day) survival of small salmonids. Deux etudes en laboratoire ont permis d'evaluer la survie, la retention d'etiquettes et la croissance (n = 539), ainsi que la vitesse de nage critique ([U.sub.crit]; n = 241) de petits saumons chinooks (Oncorhynchus tshawytscha, longueur a la fourche (LF) : 36-99 mm; fardeau de l'etiquette : 0,7-26,7 %). Une nouvelle etiquette acoustique active a ete implantee dans des poissons, qui ont ete compares a des temoins non etiquetes a 12 et 17 [degrees]C. Aucune difference n'a ete relevee entre les etudes en ce qui concerne la temperature. Tous les poissons temoins ont survecu. Tous les poissons etiquetes de LF [greater than or equal to] 58 mm ont survecu et conserve leur etiquette. Des modeles de regression ont predit des taux de survie et de retention de [greater than or equal to] 98,6 % pour les poissons etiquetes de LF [greater than or equal to] 58,6 mm ou de masse [greater than or equal to] 1,9 g (fardeau de l'etiquette : 4,2 %). Aucune difference sur le plan de la croissance n'a ete relevee entre les traitements. L'analyse de regression par spline fait ressortir des [U.sub.crit] semblables pour les poissons temoins et les poissons etiquetes de LF [greater than or equal to] 57,3 mm. Nous recommandons l'etiquetage de saumons de LF [greater than or equal to] 59 mm ou de masse [greater than or equal to] 1,9 g (fardeau [less than or equal to] 4,2 %), cette directive devant toutefois etre confirmee sur le terrain. Les resultats des etudes constituent un pas important vers l'utilisation de la nouvelle etiquette active dans des etudes de telemetrie acoustique de terrain qui estiment la survie a court terme (30 jours) de petits salmonides. [Traduit par la Redaction], Introduction Advancements in active acoustic telemetry technology (reduced tag size, improved power outputs, signal strength, and battery life) have allowed researchers to push the limits of acceptable size-at-tagging guidelines for [...]

Published
2021
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