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Simulating the Oceanic Migration of Silver Japanese Eels.
Yu-Lin Chang1, Yasumasa Miyazawa2, Mélanie Béguer-Pon3
1Institute of Marine Environmental Sciences and Technology, National Taiwan Normal University, Taipei, Taiwan, 11677.
Plos One
|March 17, 2016
Summary
Silver Japanese eels use specific navigation strategies, not random swimming, to reach their spawning grounds. Ocean currents significantly influence migration routes and duration, with faster currents aiding eel journeys.
Area of Science:
- Marine Biology
- Oceanography
- Ichthyology
Background:
- The oceanic migration of silver Japanese eels (Anguilla japonica) is crucial for their life cycle, connecting East Asian growth habitats to spawning grounds near the West Mariana Ridge.
- Actual migration routes and the eels' navigational strategies remain largely undetermined, posing a challenge for conservation efforts.
Purpose of the Study:
- To investigate potential oceanic migration routes and strategies of silver Japanese eels.
- To determine the minimum swimming speeds and navigational tactics required for successful spawning migration.
- To assess the influence of ocean circulation patterns on eel migration dynamics.
Main Methods:
- Utilized a particle tracking method with virtual eels (v-eels) within the Japan Coastal Ocean Predictability Experiment 2 (JCOPE2) ocean circulation model.
- Simulated four distinct horizontal swimming strategies: random heading, true navigation, fixed heading towards the spawning area, and swimming against the Kuroshio Current.
- Analyzed the impact of varying swimming speeds and oceanographic conditions on migration success and duration.
Main Results:
- Non-random swimming strategies, including true navigation and fixed heading, enabled virtual eels to reach the spawning area within eight months at a speed of 0.65 m s-1.
- Estimated minimum swimming speeds for successful migration were 0.1 m s-1 (true navigation), 0.12 m s-1 (fixed heading), and 0.35 m s-1 (against Kuroshio).
- Observed eel swimming speeds (0.03 m s-1) are insufficient for timely migration via tested strategies; ocean circulation, particularly the Kuroshio Current, significantly impacts migration by advection and by influencing travel time.
Conclusions:
- Silver Japanese eels likely employ sophisticated navigation strategies rather than random movement for their oceanic migrations.
- Ocean currents play a critical role in facilitating or hindering eel migration, affecting both route and duration.
- Understanding the interplay between eel behavior and ocean dynamics is essential for predicting and protecting migratory pathways.
