[google-translator]
76,736 OCEAN PASSPORTS
1,476 PARCELS SPONSORED
1,239 SPECIES FRIENDED

Fish Vaccinations Fail When Sea Lice Infections Chew Through Their Protective Effects

Source: Hakai Magazine/Yao-Hua Law - March 9, 2018 in Science/Tech

Fish Vaccinations Fail When Sea Lice Infections Chew Through Their Protective Effects
Photo: Jebulon/Wikimedia Commons (CC0)

There are almost twice as many salmon being reared in fish farms today than a decade ago, and aquaculturists lean heavily on vaccines to keep their livestock healthy. Yet for the most part, vaccines are highly specific defenses: each is developed for a single target, such as a species of bacteria or strain of virus. And as a new study shows, when salmon have multiple infections, the efficacy of vaccines declines.

Marine biologist José Gallardo, who works at the Pontifical Catholic University of Valparaíso in Chile, says his study is the first to show that existing vaccines are ineffective at protecting salmon against co-infection by multiple pathogens. “Our research has put this issue in the global public debate on fish health,” Gallardo says.

“Regulations in Chile, Canada, and Norway do not consider this phenomenon,” he adds. “I do not know if fish farmers are aware.”

Gallardo and his team examined how vaccinated Atlantic salmon fared with infections by two agents: the bacteria Piscirickettsia salmonis, which causes a disease known as piscirickettsiosis; and the sea louse Caligus rogercresseyi.

Read Full Story

To view the Creative Commons license for the image, click here.

Print article