Vibriosis
Caused by species of the genus Vibrio and other gram-negative strains may be involved affecting all life stages of shrimp.
Symptoms
- Heavy colonization in cuticle surfaces during larval or growing stages.
- Presence of melanized wounds in skeleton surface.
- Empty G.I. tract.
- Striated muscle.
- Melanized modules and colouring paths on hepatopancreas.
Mode of Transmission
Present in flora and water, Vibriosis may arise from heavy colonizing group laying on exoskeleton surfaces and open wounds. Also may be present on detritus or shrimp feed particles exposing animal to this predominant pathogenic bacteria.
Diagnosis
During Vibrio spp. bacterial infection, shrimp’s disease parameters can be established following this demonstration:
- Identification of specific Vibrio strains with microscopic presence associated internally or externally in symptomatic animals.
- Increase of tissue pigmentation especially red color.
- Shrimp weakness, usually lying at the bottom of the pond.
- Use of antibiotic sensitive tests used to determine a fast response solution (make sure that drug be allowed by international aquaculture regulators)
- Disoriented movements around pond surfaces
Control
Prevention of Vibriosis is a daily worry in the shrimp industry. To be specific, feed quality, water source, sanitation practices and principles, water exchange protocols, use of appropriated chemical correctives, accurate medication, daily monitoring parameters (larval conditions, densities, stress behavior, molting, temperature, salinity, nutrients and feeding response) and hatchery control in husbandry, nutrition and environment are the keys to consider for a successful production. In recent years, PROBIOTICS have gained customers for disease prevention in hatchery and growing stages. Consider fermentation of Aquaplex® a probiotic treatment for pond or tank inoculation. Once into water healthful bacteria present in product (13 strains of specific beneficial microorganisms plus nutrients) inhibit Vibrio and other pathogens.
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