scholarly journals Genetic Diversity of Hatchery-Bred Brown Trout (Salmo trutta) Compared with the Wild Population: Potential Effects of Stocking on the Indigenous Gene Pool of a Norwegian Reservoir

Diversity ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 414
Author(s):  
Arne N. Linløkken ◽  
Stein I. Johnsen ◽  
Wenche Johansen
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Balancing Selection ◽  
Wild Fish ◽  
Effective Population ◽  
Population Potential ◽  
Brown Trout Salmo Trutta ◽  
Age Structured ◽  
Simple Sequence

This study was conducted in Lake Savalen in southeastern Norway, focusing on genetic diversity and the structure of hatchery-reared brown trout (Salmo trutta) as compared with wild fish in the lake and in two tributaries. The genetic analysis, based on eight simple sequence repeat (SSR) markers, showed that hatchery bred single cohorts and an age structured sample of stocked and recaptured fish were genetically distinctly different from each other and from the wild fish groups. The sample of recaptured fish showed the lowest estimated effective population size Ne = 8.4, and the highest proportion of siblings, despite its origin from five different cohorts of hatchery fish, counting in total 84 parent fish. Single hatchery cohorts, originating from 13–24 parental fish, showed Ne = 10.5–19.9, suggesting that the recaptured fish descended from a narrow group of parents. BayeScan analysis indicated balancing selection at several loci. Genetic indices of wild brown trout collected in the lake in 1991 and 2010 suggested temporal genetic stability, i.e., the genetic differentiation (FST) was non-significant, although the Ne, the number of alleles per locus and the number of private alleles were lower in the 2010 sample.

scholarly journals Impacts of acidification on brown trout Salmo trutta populations and the contribution of stocking to population recovery and genetic diversity

2019 ◽  
Vol 95 (3) ◽  
pp. 719-742 ◽  
Author(s):  
Paulo A. Prodöhl ◽  
Andrew Ferguson ◽  
Caroline R. Bradley ◽  
Robin Ade ◽  
Colin Roberts ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Population Recovery ◽  
Brown Trout Salmo Trutta

scholarly journals Complex genetic diversity patterns of cryptic, sympatric brown trout (Salmo trutta) populations in tiny mountain lakes

2017 ◽  
Vol 18 (5) ◽  
pp. 1213-1227 ◽  
Author(s):  
Anastasia Andersson ◽  
Eeva Jansson ◽  
Lovisa Wennerström ◽  
Fidel Chiriboga ◽  
Mariann Arnyasi ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Mountain Lakes ◽  
Diversity Patterns ◽  
Brown Trout Salmo Trutta

Spatial and temporal genetic differentiation and effective population size of brown trout (Salmo trutta, L.) in small Danish rivers

2005 ◽  
Vol 6 (4) ◽  
pp. 615-621 ◽  
Author(s):  
Lasse F. Jensen ◽  
Michael M. Hansen ◽  
Jens Carlsson ◽  
Volker Loeschcke ◽  
Karen-Lise D. Mensberg
Keyword(s):  
Genetic Differentiation ◽  
Population Size ◽  
Effective Population Size ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Effective Population ◽  
Brown Trout Salmo Trutta

Genetic monitoring of supportive breeding in brown trout (Salmo trutta L.), using microsatellite DNA markers

2000 ◽  
Vol 57 (10) ◽  
pp. 2130-2139 ◽  
Author(s):  
Michael M Hansen ◽  
Einar E Nielsen ◽  
Daniel E Ruzzante ◽  
Carmen Bouza ◽  
Karen-Lise D Mensberg
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Allelic Diversity ◽  
Reference Population ◽  
Randomization Test ◽  
Population Bottlenecks ◽  
Effective Population ◽  
Supportive Breeding ◽  
Statistical Procedures ◽  
Brown Trout Salmo Trutta

Stocking with offspring of local wild fish, so-called supportive breeding, is often advocated as an alternative to stocking domesticated fish. However, it is important to ensure that supportive breeding does not result in inbreeding and loss of genetic variability. We analysed eight microsatellite loci in samples of wild and hatchery-reared brown trout (Salmo trutta) from three populations subject to supportive breeding. For calibrating statistical procedures, we included two test samples of reared offspring for which the precise number of parent fish was known and a sample from a further wild reference population. Three different statistical procedures were used to detect population bottlenecks and loss of variability: (i) a randomization test for comparing allelic diversity between samples; (ii) estimates of effective number of breeders from gametic-phase disequilibrium; and (iii) a test for assessing population bottlenecks based on detecting deviations from mutation-drift equilibrium. All three procedures were useful but they also exhibited different strengths and limitations, with the test for population bottlenecks probably being the single most useful procedure for routine monitoring. In two populations subject to supportive breeding, there were strong indications of reduced effective population sizes, and significant genetic differentiation was observed between different samples from the same population.

scholarly journals Parental genetic diversity of brown trout (Salmo trutta m. fario) brood stock affects offspring susceptibility to whirling disease

2015 ◽  
Vol 8 (1) ◽  
pp. 141 ◽  
Author(s):  
Edit Eszterbauer ◽  
Barbara Forró ◽  
Zoltán Tolnai ◽  
Csaba Guti ◽  
Gergely Zsigmond ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Whirling Disease ◽  
Brood Stock ◽  
Brown Trout Salmo Trutta

scholarly journals Brown trout (Salmo trutta L.) high genetic diversity around the Tyrrhenian Sea as revealed by nuclear and mitochondrial markers

Hydrobiologia ◽  
2018 ◽  
Vol 826 (1) ◽  
pp. 209-231 ◽  
Author(s):  
P. Berrebi ◽  
V. Caputo Barucchi ◽  
A. Splendiani ◽  
S. Muracciole ◽  
A. Sabatini ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Tyrrhenian Sea ◽  
High Genetic Diversity ◽  
Mitochondrial Markers ◽  
Brown Trout Salmo Trutta

scholarly journals Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cornelya F. C. Klütsch ◽  
Simo N. Maduna ◽  
Natalia Polikarpova ◽  
Kristin Forfang ◽  
Benedicte Beddari ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Management Practices ◽  
Tandem Repeats ◽  
Morphological Changes ◽  
Genetic Erosion ◽  
Wild Fish ◽  
Breeding Practices ◽  
Modern Breeding

AbstractMaintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (Salmo trutta) samples to study fine-scale and short-term impacts of different management practices. These had changed from traditional breeding practices, using the same broodstock for several years, to modern breeding practices, including annual broodstock replacement, in the transnational subarctic Pasvik River. Using population genetic structure analyses (i.e., Bayesian assignment tests, DAPCs, and PCAs), four historical genetic clusters (E2001A-D), likely representing family lineages resulting from different crosses, were found in zone E. These groups were characterized by consistently lower genetic diversity, higher within-group relatedness, lower effective population size, and significantly smaller body size than contemporary stocked (E2001E) and wild fish (E2001F). However, even current breeding practices are insufficient to prevent genetic diversity loss and morphological changes as demonstrated by on average smaller body sizes and recent genetic bottleneck signatures in the modern breeding stock compared to wild fish. Conservation management must evaluate breeding protocols for stocking programs and assess if these can preserve remaining natural genetic diversity and morphology in brown trout for long-term preservation of freshwater fauna.

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