Aquat. Living Resour.
Volume 32, 2019
|Number of page(s)||11|
|Published online||06 September 2019|
Flat oyster fishery management during a time with fluctuating population size
Danish Shellfish Centre, National Institute of Aquatic Resources, Technical University of Denmark, Øroddevej 80, 7900 Nykøbing Mors, Denmark
* Corresponding author: firstname.lastname@example.org
Handling Editor: Pauline Kamermans
Accepted: 15 August 2019
Wild populations of the native European flat oyster (Ostrea edulis) are nowadays rare. Worldwide, flat oyster populations have declined due to overexploitation, diseases and pollution. Yet, in the Limfjorden, Denmark, a small but persistent population of wild flat oyster have endured for more than 165 years, which has sustained a unique fishery on wild oyster beds. Over time, fluctuations in the wild population size has had implications for the fishery, alternating between a large population with high yields, and too small to withstand a fishery. The flat oyster fishery has been alleged to cause these unpredictable fluctuations in the population. However, the combined effect of natural variation (e.g. water temperature) and the fishery has not been investigated. Here we indicate that summer water temperature is an important factor causing fluctuations in the flat oyster population, thought to be due to its influence on recruitment success. Whereas the fishery often constitutes a minor part of the net oyster mortality. We found a positive correlation between summer water temperature and increased oyster landings ≥5 years later. Our results demonstrate the importance of adaptive management for the oyster fishery in the Limfjorden, which has ensured the survival of the flat oyster population, even when the oyster population has been low. These results highlight that management based on annual stock assessments, closed areas with brood stock, and dynamic annual total allowable catch, can ensure the persistence of an endangered oyster species and support a sustainable fishery.
Key words: Endangered species / sustainable fishery / population dynamics / temperature / recruitment
© P. Nielsen and J.K. Petersen, by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.