Laura, I had to look up cock salmon, and I'm glad I did:

When the Male Atlantic Salmon, or Cock Salmon eventually returns to its home it goes through something of a transformation in its appearance, from the familiar torpedo shaped bar of silver, into what could easily be thought to be totally different fish. People who see one in our studio often ask “what on earth is that odd fish?” This staggering transformation takes just a few weeks or months and is not just a radical change in colouration but also a physical change. The head becomes elongated and develops a long hooked jaw or kype and its colouration and patterning becomes vivid and complex, often referred to as “tartan” in fishing circles.

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Editor of No Crime in Rhymin' and Language Lab | the Woke Bloke ..."come for the sarcasm, stay for my soft side"

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