For a short time every year, adult Pacific lamprey leave the ocean and swim upriver to spawn – they pick fast flowing streams with rocky bottoms where they clean out a nest, lay 10,000s of eggs which fall between the stones in their redd. Not long thereafter the adults die. However they are secretive and unobtrusive and can be difficult to locate. To find these lamprey I had to cover a wide swathe of river, sometimes swimming sometimes walking, when I found them they were in such a fest flowing section of river that the weight I had was not enough to keep me in place. I wedged myself against a boulder near the lamprey nest and stayed as long as I could tolerate the cold water.