Effects of fin-clipping regarding adult return rates in hatchery-reared brown trout

Petersson, Erik; Rask, Jörgen; Ragnarsson, Bjarne; Karlsson, Lars; Persson, Jens

doi:10.1016/j.aquaculture.2013.12.020

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…At this occasion we also collected the outermost 3mm of the adipose fins (stored in 95% ethanol) from all fish to determine pre-release telomere length. Adipose fin clipping is a common practice in release of salmonid fish and unlikely to have affected behaviour or survival of fish [29,30]. Due to natural growth in the wild, batches differed slightly in size (ANOVA; df = 2, F = 8.…”

Section: Tissue Sampling and Fish Size Measuresmentioning

confidence: 99%

Telomere length covaries with personality in wild brown trout

Adriaenssens

Pauliny

Blomqvist

et al. 2016

Physiology & Behavior

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The prevalence of consistent among-individual differences in behaviour, or personality, makes adaptive sense if individuals differ in stable state variables that shift the balance between the costs and benefits of their behavioural decisions. These differences may give rise to both individual differences in, and covariance amongst, behaviours that influence an individual's exposure to risks. We here study the link between behaviour and a candidate state variable previously overlooked in the study of state-dependent personality variation:telomere length. Telomeres are the protective endcaps of chromosomes and their erosion with age is thought to play a crucial role in regulating organismal senescence and intrinsic lifespan. Following evidence that shorter telomeres may reduce the lifespan of animals in a wide range of taxa, we predict individuals with shorter telomeres to behave more boldly and aggressively. In order to test this, we measured telomere length and behaviour in wild juvenile brown trout (Salmo trutta). We found individuals with shorter fin telomeres to behave consistently more boldly and aggressively under controlled conditions in the laboratory. No such relationship was found with muscle telomere length 3-4 months after the behavioural assays. We suggest that telomere dynamics are an important factor integrating personality traits with other state variables thought to be important in the regulation of behaviour, such as metabolism, disease resistance and growth.

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Section: Tissue Sampling and Fish Size Measuresmentioning

confidence: 99%

Telomere length covaries with personality in wild brown trout

Adriaenssens

Pauliny

Blomqvist

et al. 2016

Physiology & Behavior

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show abstract

“…Marking methods for larvae or fry include immersion in fluorescent dyes (Secor et al 1991 ; Jones et al 2005 ), using transgenerational enriched stable isotopes that appear in bone tissue (Munro et al 2009 ), or chemicals such as oxytetracycline (Krumme and Bingel 2016 ). In the last 20 years, adipose fin clipping (Petersson et al 2014 ) has become the dominant form of tagging for sea trout and salmon in the Baltic catchment. The total number of fin-clipped sea trout released in 2020 in the Baltic Sea area was > 1.3 million.…”

Section: Introductionmentioning

confidence: 99%

Parentage-based tagging and parentage analyses of stocked sea trout in Vistula River commercial catches

Wąs‐Barcz

Bernaś

2023

J Appl Genetics

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The longest Baltic River, the Vistula, historically hosted numerous sea trout populations. However, dam construction in the twenty-first century drastically reduced the spawning migration rate. Reduced natural reproduction has resulted in a population collapse and, consequentially, a substantial reduction in catches. In response, like other Baltic countries, Poland has initiated an intensive stocking program, mainly involving smolt. Initially, stocking was conducted primarily with offspring of sea trout caught during spawning migration. Currently, due to difficulties in obtaining fish, most stocking involves fish from breeding stocks. Therefore, determining the proportion of fish derived from stocking has become an important issue. Experiments based on traditional tagging did not provide sufficient material for analysis; hence, we decided to use genetic methods based on analysis of relatedness. In this study, we performed parentage-based tagging and an analysis of the origins of parent animals used for artificial spawning in 2013, and offspring returning to the Vistula in subsequent years. We based the analysis on three different algorithms and compared the results, showing that the presented methods were effective for estimating mass stocking success. The study also indicated that a certain level of natural reproduction in the Vistula continues to occur. The proportion of sea trout from spawning in 2013 in Vistula sea trout catches from 2017 to 2018 was approximately 30%.

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“…Thus, the removal of AF may not contribute to any direct mortality of the parr and smolts and this was confirmed by the survival data of parr and smolts from our study. Petersson et al [12] also suggested that multiple fin removal and single removal of pelvic or pectoral fins are harmful for brown trout (Salmo trutta) but removal of adipose fin can be performed without affecting the welfare of the fish.…”

Section: Discussionmentioning

confidence: 99%

“…For any of the available techniques to be valid, marks must be permanent or at least last long without any detrimental effects on the target fish species growth, reproduction or survival and health and welfare. Various marking methods, such as fin clipping, genetic marking, and external and internal tags have been used to identify individual fish over the decades in fisheries related studies [7][8][9][10][11][12]. In North America, annually various salmon species in several millions are externally marked for stock enhancement purposes [13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Three External Marking Methods of Farmed Atlantic Salmon for the Future Use of Differentiating it From Wild Atlantic Salmon

Mortensen¹,

Hansen²,

Puvanendran³

2016

J Aquac Res Development

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We evaluated different external marking methods for farmed salmon to differentiate it from wild salmon without any special tools. Three marking methods were tested: 1) Adipose fin (AF) removal, 2) Freeze branding (FB) and, 3) Visible Implant Elastomer (VIE). Location of the marking method on the fish, combination of marking methods and degree of AF removal were tested in three experiments. Atlantic salmon parr weighing 20 g were marked either with individual marks or in combination of two. Further all the fish were also PIT tagged. They were kept in freshwater tanks for 4 months and later after smoltification, smolts were transferred to sea cages and kept for another 4 months. At the end of four (freshwater phase) and ten (sea cages) months, growth, survival and mark retention were recorded. All these methods had no significant effects on growth and survival compared to the control (no mark but only PIT tagged). Our results showed that of these methods, only complete removal of the adipose fin met the requirements for mark retention and was the cheapest and easiest method to automate. However, a larger commercial scale long-term testing of the AF clipping is required prior to implementing it. Further development of an automated fin clipping in combination with vaccination and an open discussion with consumers, buyers, and environmental groups are also warranted.

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Effects of fin-clipping regarding adult return rates in hatchery-reared brown trout

Cited by 10 publications

References 35 publications

Telomere length covaries with personality in wild brown trout

Telomere length covaries with personality in wild brown trout

Parentage-based tagging and parentage analyses of stocked sea trout in Vistula River commercial catches

Evaluation of Three External Marking Methods of Farmed Atlantic Salmon for the Future Use of Differentiating it From Wild Atlantic Salmon

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