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A new species of the fish pathogenic bacterium Edwardsiella - NVH

A new species of the fish pathogenic bacterium Edwardsiella - NVH | Aquaculture Directory | Scoop.it

Takele Abayneh Tefera's doctoral research project has uncovered a genetic divergence between the fish pathogen Edwardsiella tarda and Edwardsiella tarda type strain. He has also identified phenotypic markers that distinguish one from the other. The fish pathogenic strain is now classified as a separate species: Edwardsiella piscicida.

 

 

Edwardsiella tarda is a bacterium that can infect a number of animal species and also humans. Edwardsiellosis is one of the most serious systemic bacterial diseases in fish, resulting in substantial losses in the fish farming industry all over the world.

 

Takele Abayneh Tefera has developed effective molecular tools for the identification and characterization of different strains of Edwardsiella. He developed a new TaqMan real-time and conventional PCR analysis for this purpose and then evaluated it in relation to the Loop Mediated Isothermal Amplification (LAMP) analysis. For the first time, he also used the Multi-locus Sequence Analysis (MLSA) for the typing and characterization of E. tarda, isolated from different sources. This is a useful tool for detecting sources of infection and for understanding the epidemiological relationship between isolates from the environment, fish, livestock and humans.


Via John Bostock
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Ouch! An isopod grabbed my tongue - Australian Museum

Ouch! An isopod grabbed my tongue - Australian Museum | Aquaculture Directory | Scoop.it
Biting your tongue takes on a whole new meaning when it comes to these parasites, says marine biologist Melissa Beata Martin.

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John Bostock's curator insight, October 11, 2013 8:23 AM

I think there will be quite a few fish farmers who don't share Melissa's enthusiasm for these parasites, but good to know they are getting some research attention

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Ammonia in fish ponds | UPM Aquatic Animal Health Unit

Ammonia in fish ponds | UPM Aquatic Animal Health Unit | Aquaculture Directory | Scoop.it

Ammonia is toxic to fish if allowed to accumulate in fish production systems. When ammonia accumulates to toxic levels, fish cannot extract energy from feed efficiently. If the ammonia concentration gets high enough, the fish will become lethargic and eventually fall into a coma and die.

In properly managed fish ponds, ammonia seldom accumulates to lethal concentrations. However, ammonia can have so-called “sublethal” effects—such as reduced growth, poor feed conversion, and reduced disease resistance—at concentrations that are lower than lethal concentrations


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John Bostock's curator insight, October 11, 2013 8:27 AM

Nice blog article on the health effects of ammonia build up in fish ponds and how the problem may be managed