News features and technical articles about the evolution of aquaculture, one of the world’s fastest growing industries.

De-Hai Xu

Health & Welfare

Virulent Aeromonas hydrophila in channel catfish

This study investigated factors that predisposed catfish to motile Aeromonas septicemia (MAS) caused by virulent Aeromonas hydrophila (vAh). Results revealed that wounding on fish body surface was important for vAh infection and disease development. 

Health & Welfare

Parasite treatment reduces F. columnare infection in tilapia

The authors conducted a study to evaluate whether treatment of Trichodina-parasitized tilapia with formalin would improve fish survival and reduce F. columnare infection. Tilapia not treated with formalin showed significantly higher mortality than treated fish. 

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Health & Welfare

Parasitism enhances tilapia susceptibility to Flavobacterium columnare

The bacterium Flavobacterium columnare and parasite Ichthyophthirius multifiliis (Ich) are common pathogens that can cause heavy economic losses for fish culture. The authors conducted a study to evaluate the susceptibility of hybrid tilapia to F. columnare, including fish mortality and 

Health & Welfare

Parasitism enhances susceptibility to bacterial infection in tilapia

The authors conducted a study to evaluate whether tilapia infected with Gyrodactylus were more susceptible to Streptococcus iniae. The research found that fish with a solo infection of Gyrodactylus or Streptococcus had less than 7 percent total mortality. 

Health & Welfare

Tilapia show immunization response against Ich

In research on alternatives to formalin treatment to control Ich infestation, the authors performed a study that compared the immune responses of Nile tilapia and red tilapia against the parasite.