Distribution, migrations, and growth of tagged sea trout released into the Vistula River

Bartel, R.; Pachur, Marzena; Bernaś, Rafał

doi:10.2478/v10086-010-0026-8

Cited by 11 publications

(9 citation statements)

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“…These findings also indicate that fish may migrate across borders so that in the long run there is a need to seek close cooperation with the fisheries in the Baltic states to minimize early losses by unintentional catches, including an effective rewarding system for reporting and release after capture. Rewards for returning tags recovered from tagged fish are small in Poland, and tag returns are currently at a level of <1%, while in the best years this figure reached 10% (Bartel et al., 2010).…”

Section: Outline Of the Polish Strategy To Restore Sturgeon And Perspmentioning

confidence: 99%

Review of the current status of the Atlantic sturgeon Acipenser oxyrinchus oxyrinchus Mitchill 1815, in Poland: principles, previous experience, and results

Kolman

Kapusta

Duda

et al. 2011

Journal of Applied Ichthyology

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The article presents the principles of the program to restore the Atlantic sturgeon Acipenser oxyrinchus in Poland and the results obtained to date. Since 2004, various life cycle stages (fertilized eggs, hatchlings, fingerlings) obtained through the controlled reproduction of wild spawners caught in the St John River in Canada have been imported. Broodstocks are held in three facilities, two of which were built specifically for the Atlantic sturgeon restoration programme. From each group of the initial imports from Canada, 50-100 individuals are being held for further rearing. Additionally about fifty individuals from the 1997 and 2001 year classes were transferred from the Leibniz-Institute of Freshwater Ecology and Inland Fisheries (Berlin, Germany). These are also the offspring of earlier imports from Canada. Juvenile sturgeons are used for experimental stocking and studies aimed at increasing rearing effectiveness. Rearing early life cycle stages of Atlantic sturgeon was a difficult task, the final results of which remained unpredictable in early trials. The highest losses of larvae are incurred when the fish begin exogenous feeding. Feeding studies focus on the selection of appropriate diets and feeding strategies. The latest results indicate that during the initial feeding period, the fish can be fed once daily. Studies on sturgeon migration were conducted in the Drwęca River, and the results indicated that migration rates vary significantly among juvenile sturgeon, with the mean migration rate in spring being lower than in autumn. Currently, the Polish efforts to restore the Atlantic sturgeon focusses on (i) building broodstocks at specialized facilities, (ii) improving hatching and early rearing techniques, (iii) performing experimental stocking with hatchery-reared juveniles, and (iv) acquiring knowledge on the basic elements of the Atlantic sturgeon life history under local conditions. Fertilized eggs of A. o. oxyrinchus will still have to be imported from Canada for several years before self-sufficient production from raised ex-situ brood stocks will become available. The formation of a Polish ex-situ founder population is imbedded in an overall restoration approach in close cooperation with the neighbouring country having shared sturgeon waters and this is in line with the respective international recommendations for sturgeon species conservations.

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Section: Outline Of the Polish Strategy To Restore Sturgeon And Perspmentioning

confidence: 99%

Review of the current status of the Atlantic sturgeon Acipenser oxyrinchus oxyrinchus Mitchill 1815, in Poland: principles, previous experience, and results

Kolman

Kapusta

Duda

et al. 2011

Journal of Applied Ichthyology

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“…Long‐distant marine migration has also been observed with a handful of individuals sampled several hundred kilometres away from their natal river (Balmain & Shearer, ; Euzenat, Fournel, & Richard, ; Pratten & Shearer, ; Skrochowska, ). Northward marine migration has often been reported in Europe for sea trout individuals native from Bresle, France (Euzenat et al., ), Vistula, Poland (Bartel, Pachur, & Bernaś, ; Skrochowska, ), North Esk, Scotland (Pratten & Shearer, ), Himlean, Sweden (Aldven, Hedger, Okland, Rivinoja, & Hojesjo, ), Vardnes, Norway (Berg & Berg, ). On the contrary, a dominant southward marine direction prevails for native sea trout individuals from Tweed, Scotland (Balmain & Shearer, ).…”

Section: Introductionmentioning

confidence: 99%

Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L.

Masson

Lepais

Manicki

et al. 2017

Ecology of Freshwater Fish

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Gathering information on both individual movement and gene flow is rarely possible when studying dispersal among populations in fish species. It is, however, possible to assess both at a reasonable cost in Salmo trutta L. on the Atlantic coast of Europe where the facultative anadromous species is composed of discrete populations of brown trout residents occupying distinct river systems, but exchanging phenotypically distinguishable sea trout migrants. We performed two kinds of genetic analyses using individual microsatellite genotypes: the stock identification of sea trout entering each corridor and the estimates of effective dispersal through each corridor. We observed that individual movement (nonlocal individuals of each source population ranging from 4% to 35% of the sea trout run) never translates into effective dispersal except in one of four migratory corridors examined. The likely origin of this uniquely detected gene flow event is discussed in the light of well-documented migratory fish management actions undertaken in the past in the studied area. K E Y W O R D Sbrown trout, effective dispersal, homing, sea trout, straying

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“…This approach is routinely applied for determining migratory routes, timing, and catch share for several marine and anadromous fish [2], [3] and not only offers a way to perform stock-specific management but also facilitates the establishment of targeted stock-specific regulatory measures tailored towards safeguarding vulnerable populations [4]. In the Baltic Sea area, there is particular interest in learning more about the source(s) of Tagging studies exploring sea trout costal migrations have shown that individuals from smolt stocking which were released close to the mouths of the Pomeranian rivers had very high levels of straying individuals, which can explain a significant share of Pomeranian genotypes among sea trout collected in the Vistula firth area [15,16]. Results from mass tagging experiments conducted in the 1970s in the Vistula River showed that Vistula sea trout were concentrated in the southern Baltic, mainly near the Gdańsk Bay and the Vistula mouth, which is where 65% of sea trout whitling tag Since 1985, it has been assumed that the released material should represent progeny from individuals directly caught in the river during spawning migration.…”

Section: Introductionmentioning

confidence: 99%

“…Tagging studies exploring sea trout costal migrations have shown that individuals from smolt stocking which were released close to the mouths of the Pomeranian rivers had very high levels of straying individuals, which can explain a significant share of Pomeranian genotypes among sea trout collected in the Vistula firth area [15,16]. Results from mass tagging experiments conducted in the 1970s in the Vistula River showed that Vistula sea trout were concentrated in the southern Baltic, mainly near the Gdańsk Bay and the Vistula mouth, which is where 65% of sea trout whitling tag returns were obtained [16].…”

Section: Introductionmentioning

confidence: 99%

Genetic Differentiation in Hatchery and Stocked Populations of Sea Trout in the Southern Baltic: Selection Evidence at SNP Loci

Bernaś

Poćwierz-Kotus

Árnyasi

et al. 2020

Genes

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The impacts and interactions between hatchery-bred fish and wild fish populations has been a topic of active investigation in recent decades. In some instances, the benefits of stocking can be overshadowed by negative effects such as genetic introgression with natural populations, loss of genetic diversity, and dilution of local adaptations. Methods that facilitate the identification of stocked fish enable us to estimate not only the effectiveness of stocking but also the level of natural reproduction and the degree of hybridization. The longest Baltic river, the Vistula, also has the second highest discharge. Historically, it hosted numerous populations of the anadromous form of brown trout (sea trout); however, dam construction has since interfered with and reduced spawning migration to a rate that is much lower than before. Reduced spawning has resulted in a population collapse and a negative flow-on effect on commercial catches. In response, Poland (along with many other Baltic countries) initiated an intensive stocking program which continues today and which sees the average annual release of 700,000 smolts. As a consequence, today's main-river and inshore catches come from stock-enhanced populations. High-throughput single-nucleotide polymorphism (SNP) genotyping was performed on samples of sea trout from southern Baltic populations; results suggest that a significant portion of the sea trout catches in the Vistula mouth region have direct hatchery origin and indicate the presence of Pomeranian specimens. SNP loci identified as outliers indicate a potential selection pressure that may be related with effects of hatchery breeding and mixing with natural populations. The brown trout SNP array applied in this study showed high effectiveness not only for population differentiation, but more importantly, it emerged as a sensitive tool to provide evidence of detection selection.

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Distribution, migrations, and growth of tagged sea trout released into the Vistula River

Cited by 11 publications

References 1 publication

Review of the current status of the Atlantic sturgeon Acipenser oxyrinchus oxyrinchus Mitchill 1815, in Poland: principles, previous experience, and results

Review of the current status of the Atlantic sturgeon Acipenser oxyrinchus oxyrinchus Mitchill 1815, in Poland: principles, previous experience, and results

Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L.

Genetic Differentiation in Hatchery and Stocked Populations of Sea Trout in the Southern Baltic: Selection Evidence at SNP Loci

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