1 / 20

Lobster Health in Early Life-Stages

Lobster Health in Early Life-Stages. Andrea Battison & Jean Lavallée AVC Lobster Science Centre. Disease Knowledge Base?. Adult  Larvae & Juveniles . ?? ?? ?? ?? …. Gaffkemia Bumper Car Calcinosis Shell disease …. Need for Knowledge?. Hatcheries:

sheri
Download Presentation

Lobster Health in Early Life-Stages

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Lobster Health in Early Life-Stages Andrea Battison & Jean Lavallée AVC Lobster Science Centre

  2. Disease Knowledge Base? Adult Larvae & Juveniles  • ?? • ?? • ?? • ?? • ….. • Gaffkemia • Bumper Car • Calcinosis • Shell disease • …..

  3. Need for Knowledge? • Hatcheries: • Increasing number/production • Increased risk of production-related disease can be anticipated • Develop strategies to decrease & mitigate risks Increase overall production

  4. Hatcheries:Potential Disease Risks • Intensive production model • High density • Artificial food source • Artificial water source • Artificial water movement patterns • enclosed space, ‘walls’ • STRESS general increased risk of disease

  5. Hatcheries:Potential Release Risks? • Expose ‘wild’ larvae to hatchery-origin infectious disease Pre-release screening programs in other species e.g., re-introduction

  6. Approach… • Document the disease level in hatchery-reared larval population • Compare to disease level in wild larval populations

  7. Document Disease Level:Hatchery • All life stages: • Egg • Larval Stages I - IV • Multiple production times • Early summer • Mid-summer • Late-summer

  8. Document Disease Level: Hatchery • Tissue for histological examination • 100 eggs/production cycle • 100 of each larval stage/production cycle • 50% examined, • 50% stored as reference material

  9. Larval Histology Stage III

  10. Findings: • Surface Fouling (gills) • Mild to moderate • Stage III Stage IV • Husbandry?

  11. Findings: • Erosion & Ulceration • Mild • Multifocal • Stage II – IV • Trauma?

  12. Findings • Protozoan infection • mortality (1 tank, one cycle only) • Gills - primary site of infection • Mild to marked, inflammation with melanin

  13. ProtozoalInfection:Gill

  14. ProtozoalInfection:Gill

  15. Findings • Protozoan infection • mortality (1 tank, one cycle only) • Gills - primary site of infection • Mild to marked, inflammation with melanin • Stages III & IV affected, all production cycles • Opportunist? • Food source - negative

  16. Disease Findings: Summary

  17. Summary • Documented conditions seen in one hatchery environment • Primary pathogen or opportunistic? • Decreased overall production? • Intervention strategies possible? • Risk to wild-hatched population? • Naturally present?

  18. Questions?

  19. Findings: • Muscle Degeneration • Mild to moderate • Multifocal • Stages I –III • Nutritional? • Exertional? • Normal?? Stage I

  20. Findings • Parasite Migration • Mild • Muscle • Hepatopancreas • ± inflammation • Stage III & IV • Off-course?? Stage IV

More Related