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Evolution of Snakehead fish

Last night I watched a documentry about these fish which started off a bit of an enquiry between myself and Mandette.

Snakehead, which include 2 genera; Channa in asia and Parachanna in africa split from a common ancestor sometime either in the Miocene or Cretaceous depending on source. The african snakeheads live in south west africa so there's a large void between them and their asian cousins. I believe they first evolved somewhere around india but I'd like to know how they spread from one continent to the next. Could their ancestors survive in salt water or was there a freshwater bridge available back then?

any help would be apreciated and ensure I get some work done



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