lobster health in early life-stages
DESCRIPTION
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: - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/1.jpg)
LOBSTER HEALTH IN EARLY LIFE-
STAGESAndrea Battison &
Jean Lavallée
AVC Lobster Science Centre
![Page 2: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/2.jpg)
Disease Knowledge Base?
Adult Larvae & Juveniles Gaffkemia
Bumper Car Calcinosis Shell disease …..
?? ?? ?? ?? …..
![Page 3: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/3.jpg)
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
![Page 4: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/4.jpg)
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
![Page 5: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/5.jpg)
Hatcheries:Potential Release Risks?
Expose ‘wild’ larvae to hatchery-origin infectious disease
Pre-release screening programs in other species e.g., re-introduction
![Page 6: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/6.jpg)
Approach…
Document the disease level in hatchery-reared larval population
Compare to disease level in wild larval populations
![Page 7: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/7.jpg)
Document Disease Level:Hatchery All life stages:
Egg Larval Stages I - IV
Multiple production times Early summer Mid-summer Late-summer
![Page 8: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/8.jpg)
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
![Page 9: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/9.jpg)
Stage III
Larval Histology
![Page 10: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/10.jpg)
Findings: Surface Fouling (gills)
Mild to moderate Stage III
Stage IV
Husbandry?
![Page 11: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/11.jpg)
Findings: Erosion & Ulceration
Mild Multifocal Stage II – IV
Trauma?
![Page 12: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/12.jpg)
Findings Protozoan infection
mortality (1 tank, one cycle only)
Gills - primary site of infection
Mild to marked, inflammation with melanin
![Page 13: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/13.jpg)
Protozoal Infection:Gill
![Page 14: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/14.jpg)
Protozoal Infection:Gill
![Page 15: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/15.jpg)
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
![Page 16: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/16.jpg)
Disease Findings: Summary
Lesion Early Summer
Mid-Summer
Late Summer
Surface Fouling
SIII SIII & SIV SIII & SIV
Erosion/Ulceration
SII – SIV SIII
MuscleDegeneration
SII SI – SIII SI
Parasite Migration
SIII & SIV
ProtozoalInfection
SIIISIII - mortality
SIII & SIV
SIV
![Page 17: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/17.jpg)
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?
![Page 18: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/18.jpg)
Questions?
![Page 19: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/19.jpg)
Findings: Muscle
Degeneration Mild to moderate Multifocal Stages I –III
Nutritional?Exertional?Normal??
Stage I
![Page 20: Lobster Health in Early Life-Stages](https://reader035.vdocuments.mx/reader035/viewer/2022062310/568164d8550346895dd71e60/html5/thumbnails/20.jpg)
Findings Parasite Migration
Mild Muscle Hepatopancreas ± inflammation Stage III & IV
Off-course?? Stage IV