Retention of T-bar anchor and dart tags by a wild population of African sharptooth catfish, Clarias gariepinus

Booth, Anthony J.; Weyl, Olaf L. F.

doi:10.1016/j.fishres.2008.02.002

Cited by 15 publications

(14 citation statements)

References 23 publications

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“…Each fish was measured for SL and body mass (M) to the nearest 1 mm and 1 g, respectively. In order to ensure the best possible tag retention, all tags were inserted by the same long-experienced person (B. Turcsányi, with 20 years of tagging experience) between the pterygiophores of the dorsal fin with a Floy ® tagging gun (www.floytag.com; Booth and Weyl, 2008). Then, tagged fish were transported to the stocking site or the nearest harbour (for offshore stocking) by tanker truck in oxygenated water, at a biomass density of <60 kg m À3 (each experimental group of 250 individuals was transported in a separate tank filled with 1 m 3 culture pond water).…”

Section: Tagging and Release Of Fishmentioning

confidence: 99%

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Specziár

Turcsányi

2017

Knowl. Manag. Aquat. Ecosyst.

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-Pikeperch Sander lucioperca is an economically important fish which depleted populations need intensive management and supplemental stocking. We aimed to assess the relative influence of various pikeperch stocking strategies in Lake Balaton, Hungary, and tested 60 stocking set-ups (two seasons Â three lake areas Â shore vs. offshore release Â five size groups) by releasing 3000 tagged yearlings. Anglers reported data of 522 recaptures within four years after stocking. Recapture rate was highest in stocking of the most productive lake area, increased with fish size, was higher in shore than offshore releases, but did not differed between stocking seasons. Fish stocked to oligotrophic areas travelled longer distances and dispersed more than those stocked to the mesotrophic area. Fish size had little effect, whereas season and method of stocking had no effect on dispersal of fish. To conclude, in pikeperch, autumn stocking with large yearlings released directly from the shore is recommended over other set-ups. Stocking quotas may be concentrated in space in low productivity areas, but should be dispersed between multiple sites in food rich areas to attain complete dispersal. This study provides a framework for testing fisheries management alternatives and behaviour of stocked fish in intensively utilized habitats.Keywords: angling / fisheries management / mark and recapture / Sander lucioperca / stocking strategy Résumé -Gestion de l'empoissonnement de sandre dans le lac Balaton: effet de la saison, de la localisation, de la taille du poisson et de la méthode de déversement sur le taux et la distribution des recaptures. Le sandre Sander lucioperca est un poisson économiquement important dont les populations appauvries ont besoin d'une gestion intensive et d'un empoissonnement de soutien. Nous avons cherché à évaluer l'influence relative de diverses stratégies d'empoissonnement de sandre dans le lac Balaton, en Hongrie, et nous avons testé 60 configurations d'ensemencement (deux saisons Â trois zones lacustres Â zone riveraine Â zone de remise à l'eau au large Â cinq groupes de taille) en relâchant 3 000 animaux d'un an marqués. Les pêcheurs à la ligne ont apporté des données sur 522 poissons recapturés dans les quatre ans suivant le déversement. Le taux de recapture était le plus élevé dans la zone lacustre la plus productive, il augmentait avec la taille des poissons, était plus élevé sur le rivage que dans les eaux hauturières, mais ne différait pas d'une saison à l'autre. Les poissons déversés dans les zones oligotrophes ont parcouru de plus longues distances et se sont dispersés davantage que ceux déversés dans la zone mésotrophe. La taille du poisson a eu peu d'effet, alors que la saison et la méthode de mise à l'eau n'ont eu aucun effet sur la dispersion du poisson. Pour conclure, pour le sandre, il est recommandé de faire des empoissonnements d'automne avec de grands alevins de l'année relâchés directement du rivage plutôt que d'autres solutions. Les quotas de mise en charge peuvent être concentrés...

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Section: Tagging and Release Of Fishmentioning

confidence: 99%

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Specziár

Turcsányi

2017

Knowl. Manag. Aquat. Ecosyst.

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“…In contrast, the anchor tag retention was 42% after one year for striped bass, Morone saxatilis (Walbaum), (Waldman et al 1991), 25% after 560 days for white bass, Morone chrysops (Rafinesque) (Muoneke 1992), and 9% after 198 days for red roman, Chrysoblephus laticeps (Valenciennes), (Kerwath et al 2006). The high tag retention differences can vary between tagging methods, between tag size, between species and within species (Booth and Weyl 2008).…”

Section: Discussionmentioning

confidence: 96%

“…However, the tag loss rate estimated from this experiment should be extrapolated to the wild with caution because the characteristics of the natural environment, fish behaviour in the wild and interspecies interactions could modify the results (Sato et al 2016). Therefore, further tag retention studies should be conducted under natural conditions (Booth and Weyl 2008).…”

Section: Discussionmentioning

confidence: 97%

“…The tag loss could be related to scraping against hard structures or the high fish densities (Sánchez-Lamadrid 2001, Booth andWeyl 2008). Therefore, an optimal nutritional condition may result in an increased activity pattern, thus favouring tag loss.…”

Section: Discussionmentioning

confidence: 99%

“…The tag retention studies that have been conducted under natural conditions have mainly used doubletagging approaches (Adam and Kirkwood 2001, Booth and Weyl 2008, Venerus et al 2013. However, one constraint of these studies is the loss of both tags, so a "permanent tag" such as PIT, CWT or VIE has been used for comparison (Brennan et al 2005, Josephson et al 2008, Rude et al 2011.…”

Section: Discussionmentioning

confidence: 99%

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Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, <em>Argyrosomus regius</em> (Pisces: Sciaenidae)

Gil

Palmer²,

Grau

et al. 2017

Sci. Mar.

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Summary:The objective of this study was to compare the effectiveness of different tags (T-bar anchor tags, internal anchor tags and visible implant elastomers) implanted into juvenile meagre, Argyrosomus regius (Asso, 1801) for a restocking programme conducted in the Balearic Islands. Effectiveness was assessed in terms of tag loss, fish survival and fish growth by means of a tank experiment. The internal anchor tags showed the highest retention rate (100%), but the tagging mortality was also high (40%). The tagging mortality of T-bar tags was negligible. However, another tank experiment with different food rates showed the tag retention rate of the T-bar tag to be highly variable, ranging from 35% to 95%. In contrast with other reported results, the retention rate of visible implant elastomers was low (48%). Finally, none of the tested tags affected growth. In summary, the T-bar anchor tags showed the best trade-off between short-term tag retention and fish mortality, and seem to be the most suitable tagging method for meagre juveniles.Keywords: anchor tags; Argyrosomus regius; growth; meagre; tag retention; tagging mortality; visible implant elastomer.Comparación de diferentes estrategias de marcaje: Efectos en la tasa de retención, tasa de mortalidad y crecimiento de marcas alojadas en juveniles de corvina Argyrosomus regius (Pisces: Sciaenidae) criados en cautividad Resumen: El objetivo de este estudio fue comparar la efectividad de diferentes marcas (marca con anclaje en T, marca con anclaje abdominal y marcaje con elastómero visible, VIE) implantadas en corvinas juveniles (Argyrosomus regius Asso, 1801) para un programa de repoblación llevado a cabo en las Islas Baleares. La efectividad fue evaluada en función de la pérdida de marcas, la supervivencia y el crecimiento de los peces mediante un experimento en tanque. Las marcas con anclaje abdominal presentaron la tasa de retención más alta (100%), pero también presentaron la mayor tasa de mortalidad (40%). La tasa de mortalidad de las marcas con anclaje en T fue despreciable. Sin embargo, otro experimento con diferentes tasas de alimentación mostró que la tasa de retención de las marcas T fue muy variable, oscilando entre un 35% y un 95%. En contraste con otros resultados publicados, la tasa de retención de los VIE fue baja (48%). Finalmente, ninguna de las marcas testadas afectó al crecimiento. En resumen, las marcas con anclaje en T mostraron el mejor compromiso entre la tasa de retención a corto plazo y la tasa de mortalidad de los peces, y parece ser el método de marcaje más adecuado para los juveniles de corvina.Palabras clave: marcas de anclaje; Argyrosomus regius; crecimiento; corvina; tasa de retención; mortalidad por marcaje; elastómero visible. Citation/Como citar este artículo: Gil M.M., Palmer M., Grau A., Massutí E., Pastor E. 2017. Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, Argyrosomus regius (Pisces: Sciaenidae). Sci. Mar. 81(2): 171-178. doi: http://dx

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Assessment of biases in the estimation of tag shedding rates through a mark-resight experiment

2013

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Retention of T-bar anchor and dart tags by a wild population of African sharptooth catfish, Clarias gariepinus

Cited by 15 publications

References 23 publications

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Management of pikeperch stocking in Lake Balaton: effect of season, area, fish size and method of release on the rate and distribution of recaptures

Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, <em>Argyrosomus regius</em> (Pisces: Sciaenidae)

Assessment of biases in the estimation of tag shedding rates through a mark-resight experiment

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