pink gold rush在文中什么意思?

to my understanding,pink refers to the color of fish,or to be more exactly,color of the salmon meat.Pink gold rush means a rush of fishermem to the lucrative salmon fishery industry to make bunches of bucks,like a rush of migrants to an area where gold was discovered in the United States many years ago.It's all about the expression"gold rush".Rhetorically,I can give you two examples.if we talk about "black gold rush",we're talking about a rush of people to the coal mining industry in an attempt to produce wealth;if we talk about "green gold rush",we are talking about the people thronging into the forestry development to get profit.