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Rain in Northern California (finally)

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Weir is definitely used here, but more often in the context of a structure used to alter riverflow in order to catch prey, such as migrating fish or eels. These were in common use by Native Americans, and quite a few are still in existence today. They are especially useful for funneling and trapping animals during their spawning runs. Eels are like Salmon but the opposite: they live in streams for years or decades, and then head out to sea to spawn. The young then swim back to the coast, and up into the streams. Dams and overharvest of the young eels (elvers) for raising in Chinese sushi farms pose serious difficulties on their return trip, and are endangering the American eel.

Here is an image of an eel weir on the Delaware River...this is catching adult eels as they head out to sea to spawn, in the middle of the Atlantic, in the Sargasso Sea:

eel_weir.jpg


Lovely Salmon though Bonnie, glad you helped see its long journey to a successful end!
 
As long as we are dusting off our vocabularies, salmon, steelhead and other fish that are spawned in freshwater to migrate to the sea only to return to their breeding grounds after some years are "anadromous."

Steelhead have the ability to spawn and return to the sea, unlike their salmon cousins. And, once upon a time before we screwed everything up, the Mighty Los Angeles River used to have migrating steelhead every year.