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Evolving waters: A comprehensive genetic study of brown Trout (Salmo trutta) in Lough Erne

School of Biological Sciences | PHD

Applications are now CLOSED
Funding
Funded
Reference Number
SBIO-2020-1074
Application Deadline
29 February 2024
Start Date
1 October 2024

Overview

The project focuses on the assessment of brown trout (Salmo trutta) in Lough Erne, Northern Ireland, to understand and preserve its genetic integrity and ecological balance. It will use archived and newly collected samples, combined with advanced genomic techniques, to investigate the current genetic makeup of the brown trout community in Lough Erne. Initiated in response to a historical decline in trout numbers due to various environmental and human factors, the study aims to inform future conservation and management strategies by establishing a genetic baseline and understanding the impact of external influences on the brown trout's genetic structure.

"The brown trout (Salmo trutta) is a species with significant ecological and economic value in Northern Ireland, thriving in unpolluted rivers and lakes. The Erne-Macnean drainage system, encompassing 7726 km2 in northwest Ireland, includes Upper and Lower Lough Erne and the smaller Upper and Lower Lough Macnean. Lower Lough Erne, notable for its size and depth (up to 60 meters), is an important brown trout fishery. However, the 21st century has seen a worrying decline in the salmonid populations in Lower Lough Erne, attributed to factors such as pollution, habitat degradation, overfishing, reduced prey species, introduction of non-native species, diseases, and parasites. In response, the Fisheries Division of the Department of Agriculture for Northern Ireland (DANI, now DAERA) initiated a supplemental stocking program in 1968, using fish from DAERA’s Movanagher Fish Farm. Despite introducing over 3 million eyed ova and about 4.8 million fingerlings by 1983, the program's success remains challenging to assess due to the limitations in traditional fish tagging methods. Genetic studies in the 1980s, particularly by Taggart & Ferguson from Queen’s University, revealed significant variation in hatchery genetic contribution among trout populations, raising concerns about the impact on Lough Erne’s genetically distinct brown trout. As part of several studies on the genetics of brown trout in the island of Ireland, from 2000 to 2011, Prodöhl’s group also at Queen’s University conducted further genetic screening, focusing on the LDH5-C* ancestral polymorphism to track the presence of native genetic markers. This period saw an increase, although unconfirmed, in these native markers, indicating a need for a more comprehensive genetic survey. This new study proposes to use unique material from an archived collection of brown trout samples from Lough Erne, held by Prodöhl’s group, and new samples collected by AFBI and local angling clubs. By integrating these samples with advanced genomic techniques and bioinformatics pipelines, the study aims for a thorough analysis of the brown trout's current genetic makeup including assessment of the evolutionary genetic heritage, contemporary population structuring, genetic stock identification, and the impact of supplemental stocking. The project's primary goal is to generate scientific data to guide the development and implementation of strategies for managing and conserving the brown trout, ensuring the preservation of their genetic integrity and ecological balance. The project also aims to establish an essential genetic baseline for the species in Lough Erne, crucial for monitoring future genetic changes and understanding the impact of environmental and human factors on their genetic structure. This knowledge is vital for making informed decisions for the effective conservation of this species.

Supporting References:
- Delanty, K., Bradley, C., O'Grady, M. & Prodöhl, P. A. (2022). Population structure and genetic stock identification of the Lough Corrib brown trout. Inland Fisheries Ireland / Iascach Intíre Éireann. 53 p.
- Mcmeel, O.M., Hoey, E.M. and Ferguson, A., 2001. Partial nucleotide sequences, and routine typing by PCR-RFLP, of the brown trout (Salmo trutta) lactate dehydrogenase, LDH-C1*90 and *100 alleles. Molecular Ecology, 10, 29-34.
- Kennedy, R.J., Rosell, R., McElarney, Y., Gallagher, K. and Allen, M. (2021). Long term abundance patterns of potamodromous brown trout in a large lacustrine catchment in County Fermanagh. Biology and Environment: Proceedings of the Royal Irish Academy, Volume 121B, Number 3, 2021, pp. 133-145.
- Taggart, J.B. and Ferguson, A., 1986. Electrophoretic evaluation of a supplemental stocking program for brown trout, Salmo trutta L. Aquaculture and Fisheries Management, 17, 155-162.

Postgraduate Research applicants who are interested in applying for this fully funded studentship must have applied to Queen’s University Belfast, via the Direct Applications Portal (link below), and submitted all required supporting documents by the closing date: https://dap.qub.ac.uk/portal/user/u_login.php For further information about academic requirements please see below: https://www.qub.ac.uk/courses/postgraduate-research/biological-sciences-phd.html

Funding Information

Funded by the Department for the Economy (DfE). For UK domiciled students the value of an award includes the cost of approved tuition fees and maintenance support the 2024/25 rates are still to be confirmed (current rates for 2023/24 are Fees £4,712, Stipend £18,622). To be considered eligible you must have been ordinarily resident in the UK for the full 3-year period prior to the start of the studentship and you must be ordinarily resident in Northern Ireland on the first day of the start of the studentship. For further information about eligibility criteria please refer to the DfE Postgraduate Studentship Terms and Conditions at https://www.economy-ni.gov.uk/publications/student-finance-postgraduate-studentships-terms-and-conditions

Project Summary
Supervisor

Professor Paulo Prodohl

Research Profile


Mode of Study

Full-time: 3 years


Funding Body
DfE
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