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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:

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Lobster Health in Early Life-Stages

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  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

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