It could be cysts, are you talking lake whitefish by chance? If you cook fish well there is no concern whatsoever, lowers the commercial value more than anything (whitefish in particular, some lakes fish have epidemic amounts of cysts). Unless I'm not understanding what you mean but I've processed lots of whitefish with little black cysts in the meat. Its from a tapeworm if your interested, but it can't survive in people (specialist).
Pike can have several species of tapeworm, one can affect people. I'm pretty sure its the only one in Alberta you can contract by not cooking your fish good enough.
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