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Since last summer, the NLH has been working hard on the DEFRA-funded Genetic Management of Lobster Releases (GEMALOR) research project, led by the University of Exeter. As leaders in lobster stock enhancement in the UK, we constantly strive to improve the efficiency of our work in supporting the sustainability of vulnerable lobster stocks. This groundbreaking project has the potential to revolutionise how we manage and release lobsters, not just at our hatchery, but for stock enhancement initiatives across the UK and globally.
GEMALOR focuses on understanding how genetic diversity influences lobster survival from larvae to juvenile stages. Our satellite hatchery in Newlyn Harbour has served as the base for this research, where we’ve raised lobster larvae from individual berried hens and meticulously tracked their development. By analysing the genetics of these larvae and their mothers, we aim to determine whether survival to the juvenile stage is connected to genetic makeup. This is essential for ensuring that the genetic diversity of wild lobster populations is not compromised by the lobsters we release.
By genetically linking surviving juveniles to their mother following communal larval culture, the project will also demonstrate how much variation there is in the contribution of individual brood hens to releases, and whether [our] productivity can be improved by identifying traits common to those hens whose offspring perform best in the hatchery.
“Without proper genetic management, population enhancement efforts can unintentionally reduce genetic diversity, which is crucial for the fitness and adaptability of lobsters. Through GEMALOR, we aim to assess and preserve genetic diversity in both hatchery-reared and wild lobster populations, ensuring our releases support the resilience of local stocks.” – Dr Charlie Ellis, University of Exeter
This project has been a huge task. Our team has counted and managed over 140,000 individual larvae during the trials—something that required incredible attention to detail. In total, we’ve sampled over 5,000 juvenile lobsters for genetic analysis, alongside taking genetic samples from their mothers. These samples are stored for further study, helping us gather vital information about lobster genetics.
“The practical work for this project has been intense. Counting over 140,000 larvae was no small feat, but it was worth every effort. The genetic insights we gain could be crucial for safeguarding the future of lobster populations in the UK and even worldwide.” – Ben Marshall, Head Technician at The NLH
On Monday, 23rd September, we completed the final day of sampling. Although our practical involvement in the project is complete, the work continues. The University of Exeter now has the big job of analysing all the samples we collected and interpreting the results. The project is due to finish in Spring 2025, so watch this space to see what we discover!
Main image credit Jonny Fenn
