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Politics : Formerly About Advanced Micro Devices

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To: Bonefish who wrote (1013006)	4/24/2017 6:17:14 PM
From: Heywood40	Read Replies (1) of 1572147

It's a delicate balance. There has to be enough water to allow the adults to get upstream to spawn in the fall, and to provide a viable environment through the winter, yet not so much water that the eggs will wash away. Temperatures have to be within a certain range through the winter...too cold, the egg dies, too warm, the egg dies. And that's just to get the eggs to hatch. Pacific coho can spend a year in the stream. That time varies among salmon species. The fry then have to get to the ocean and survive ocean conditions and predators for a number of years (1.5 to 7 or more) before they return to the same stream and repeat the cycle. Any given year's salmon return consists of fish hatched in the previous 2 to 10 years. It's hard to determine what causes the strength or weakness of any year's return because of the variation in stream and ocean time among the species and even within the species. Scale samples of returning fish can be surveyed to determine how old they are and how much time they spent in the ocean, but only after a 10 year cycle can a determination be made on the actual survival rate of any given year's hatch.

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