How to recognise and counter Streptococcus outbreaks in aquaculture

How to recognise and counter Streptococcus outbreaks in aquaculture

Source: thefishsite

2/19/2024

Credit: Phibro

Streptococcus agalactiae and S. iniae are two of the most devastating bacteria to impact the warm freshwater fish farming sector around the world – causing diseases that can lead to 80 percent mortalities. Here we describe the bacteria, their impacts and how to ensure that their presence and impacts are minimised.

Streptococcus iniae and S. agalactiae are Gram-positive bacterial pathogens of cultured and wild fish. They are spherical or ovoid in shape and 0.5-2.0 μm in diameter. They occur in pairs or chains when grown in liquid media, are non-motile and non-spore-forming.

They are facultatively anaerobic, requiring nutritionally rich media for growth, and commonly attack red blood cell to produce greenish discolouration (α-haemolysis) or complete clearing (β-haemolysis) on blood agar. Both bacteria may present zoonotic concerns.

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