PIT-tagging method for small fishes: A case study using sandeel ( Ammodytes tobianus )

Jørgensen, Michelle Grace Pinto; Deurs, Mikael van; Butts, Ian A.E.; Jørgensen, Kasper; Behrens, Jane

doi:10.1016/j.fishres.2017.04.002

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…The tag size was reduced over time, being 20 x 4.5 x 1 mm in 1958 (Bertelsen and Popp Madsen, 1958), 15 x 3 x 0.5 mm in later North Sea tags releases and 7 x 4 x 0.4 mm and 0.5 x 3 x 0.7 mm in Shetland releases (Gauld, 1990). Recent evidence based on larger pit tags suggests that these tags should not have adversely affected swimming ability (Jørgensen et al, 2017). Due to the limitations of body cavity and short life span, tagging was limited to length a range of 91< 179 mm (1+ age group).…”

Section: Post-settled Distribution and Movementsmentioning

confidence: 99%

Integrating the scale of population processes into fisheries management, as illustrated in the sandeel, Ammodytes marinus

Wright

Christensen

Regnier

et al. 2019

ICES Journal of Marine Science

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Aggregations of site-attached populations can show marked differences in density due to variation in local productivity and mortality processes. Matching management actions to the scale of biological processes is therefore important for sustainable fisheries management. This study examined the adequacy and appropriate scale of a spatially explicit management regime for sandeel, Ammodytes marinus, in the North Sea. Information from biophysical model simulations of larval transport and otolith chemistry was used to estimate the scale of mixing among aggregations. Together, these approaches indicated that there was negligible exchange of pre-settled sandeel among aggregations >200 km apart. Additionally, a re-analysis of tag-recapture experiments and distribution data indicated that the dispersive range decreased further after settlement. Significant differences in length at maturity and year-class strength not only reflect the limited mixing across the North Sea, but also point to regional differences in productivity and thereby vulnerability to fishing pressure. We conclude that the current management regime comprised of multiple assessment areas enable these differences to be considered in advice on annual fishing quotas.

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Section: Post-settled Distribution and Movementsmentioning

confidence: 99%

Integrating the scale of population processes into fisheries management, as illustrated in the sandeel, Ammodytes marinus

Wright

Christensen

Regnier

et al. 2019

ICES Journal of Marine Science

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“…On day two after returning to the laboratory, individual fish were tagged, and tissue samples were taken from all individuals. Small passive integrated transponder ('PIT') tags (12 × 2 mm, 0.1 g, Oregon RFID Inc.) were injected into abdominal cavities with a syringe implanter (MK25, Biomark Inc.) under anaesthetic following standard procedures (using MS-222, Acros Organics, UK; Jørgensen et al 2017). These small passive tags do not affect survival and growth in round goby (Ruetz et al 2006;Cookingham and Ruetz III 2008), unlike larger (e.g.…”

Section: Individual Tagging Tissue Sampling and Physical Measurementsmentioning

confidence: 99%

Behavioural and trophic variation within a well-established invasive round goby population

Moran,

Behrens

2023

Preprint

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An animal’s behavioural traits can influence the outcomes of ecological interactions within their food-web, including what they eat, their vulnerability to predation and who they compete with. Despite this, few studies have directly measured links between among-individual behavioural and trophic variation. Invasive species like the round goby (Neogobius melanostomus) are often found to have consistent among-individual differences in behaviour within and between populations across their invasion front. Therefore, an individualized approach to invasive populations and their ecological interactions may be valuable to understanding how their impacts on recipient ecosystems. Using non-lethal methods to measure trophic variation (i.e., stable isotope analysis via fin clips) and passive individual tagging, we analysed behavioural trait/personality variation and trophic variation to explore links between the two. Focusing on an established population of round gobies in Guldborgsund strait in the southwest Baltic Sea, we found significant among-individual variation in bold-exploratory traits in novel environment and refuge emergence assays. We also found strong intraspecific trophic variation, with particularly high variation in carbon-12 – carbon-13 (δ13C) suggesting that individual round gobies differ in what are feeding on and/or where they forage. Diet reconstruction results support previous studies showing that gastropods and bivalves are major contributors to their diet, but the large differences in isotope values suggest that individual variation influences how they interact with prey communities. There were few links between behavioural and trophic variation, nonetheless this study shows that measuring behavioural-trophic links is a viable approach for exploring the role of behavioural traits in individual-level ecological variation.

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“…Physical conditions measured within sites during sampling were similar (Søvang 16/5/21: 8.75ppt, 14.1 °C; Grønsund 18/5/21: 8.27ppt, 13.2 °C). Fish were transported to DTU Aqua, Lyngby, Denmark, and acclimated to laboratory conditions for 48 hours before being individually tagged with passive integrated transponder (PIT) tags (12 × 2 mm, 0.1 g, Oregon RFID Inc.), using previously published methods that have minimal effects of fish health and condition (Jørgensen et al, 2017).…”

Section: Fish and Holding Conditionsmentioning

confidence: 99%

Boldness and physiological variation in round goby populations along their Baltic Sea invasion front

Galli¹,

Behrens²,

Gesto³

et al. 2022

Preprint

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The round goby (Neogobius melanostomus) is a fish native to the Ponto-Caspian region that is highly invasive through freshwater and brackish habitats in northern Europe and North America. Individual behavioural variation appears to be an important factor in their spread, for example a round goby’s personality traits can influence their dispersal tendency, which may also produce variation in the behavioural composition of populations at different points along their invasion fronts. To further analyze the drivers of behavioural variation invasive round goby populations, we focused on two populations along the Baltic Sea invasion front with closely comparable physical and community characteristics. Specifically, this study measured personality within a novel environment and predator response context (i.e., boldness), and directly analyzed links between individuals’ personality traits and their physiological characteristics and stress responses (i.e., blood cortisol and lactate, brain neurotransmitters). In contrast to previous findings, the more recently established population had similar activity levels but were less bold in response to a predator cue than the older population, which suggests that behavioural compositions within our study populations may be more driven by local environmental conditions rather than being a result of personality-biased dispersal. Furthermore, we found that both populations showed similar physiological stress responses, and there also appeared to be no detectable relationship between physiological parameters and behavioural responses to predator cues. Instead, body size and body condition were important factors influencing individual behavioural responses. Overall, our results reinforce the importance of boldness traits as a source of phenotypic variation in round goby populations in the Baltic Sea, but that the physiological mechanisms underpinning personality trait variation in these populations remain unclear.

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PIT-tagging method for small fishes: A case study using sandeel ( Ammodytes tobianus )

Cited by 12 publications

References 39 publications

Integrating the scale of population processes into fisheries management, as illustrated in the sandeel, Ammodytes marinus

Integrating the scale of population processes into fisheries management, as illustrated in the sandeel, Ammodytes marinus

Behavioural and trophic variation within a well-established invasive round goby population

Boldness and physiological variation in round goby populations along their Baltic Sea invasion front

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