Fish Louse

Whats that big please?
Hello, i found this bug on my fish, can anyone tell me what is it? thanx and is it harmful to my whole tank now? i found it on my sick fish that has black spots all over it, then today i saw this bug, so i quarantined the fish and removed this bug to a cup alone for further investigation, please help me with my questions if you can, thank you
Adel M. Ammari

Hi Adel,
This is a Fish Louse, Argulus species. We are posting your letter with a link to a site called the FishDoc, The Home of Fish Health, that talks about treatment. You should treat immediately to avoid an infestation.

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