Impact of a reduced water salinity on the composition of Vibrio spp. in recirculating aquaculture systems for Pacific white shrimp (Litopenaeus vannamei) and its possible risks for shrimp health and food safety.
J Fish Dis
; 44(1): 89-105, 2021 Jan.
Article
in En
| MEDLINE
| ID: mdl-32971569
ABSTRACT
Tropical shrimp, like Litopenaeus vannamei, in land-based recirculating aquaculture systems (RAS) are often kept at low water salinities to reduce costs for artificial sea salt and the amount of salty wastewater. Although these shrimp are tolerant against low salinities, innate immunity suppression and changes in the microbial composition in the water can occur. As especially Vibrio spp. are relevant for shrimp health, alterations in the species composition of the Vibrio community were analysed in water from six RAS, run at 15 or 30. Additionally, pathogenicity factors including pirA/B, VPI, toxR, toxS, vhh, vfh, tdh, trh, flagellin genes and T6SS1/2 of V. parahaemolyticus were analysed. The Vibrio composition differed significantly depending on water salinity. In RAS at 15, higher numbers of the potentially pathogenic species V. parahaemolyticus, V. owensii and V. campbellii were detected, and especially in V. parahaemolyticus, various pathogenicity factors were present. A reduced salinity may therefore pose a higher risk of disease outbreaks in shrimp RAS. Because some of the detected pathogenicity factors are relevant for human health, this might also affect food safety. In order to produce healthy shrimp as a safe food for human consumption, maintaining high water salinities seems to be recommendable.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seawater
/
Vibrio
/
Aquaculture
/
Penaeidae
/
Salinity
Type of study:
Etiology_studies
/
Risk_factors_studies
Limits:
Animals
Language:
En
Journal:
J Fish Dis
Journal subject:
BIOLOGIA
/
MEDICINA VETERINARIA
Year:
2021
Document type:
Article
Affiliation country:
Alemania