197 variations, Bo wa havo cut this down to soleeting tho Sell period wnen we find tho scroatost numbers of things available. sion is serving as sort of its own control. ling many diffevent locaiicas, we ax 3 sonplins one station intensively abou rw any population cl ABTS WALLS Rich once a yeas in ordor to follow — many cacu Io. iga population S hould caocur in the Columbian River, syot waere it ought to b Fe pe, LY ean orserved first. We vould, of cource, like to bs aple to have sone ma tho fish, but we do not knov esreby Wo can go out in the bia Rivor and go out and sat anythi 2g that means anything S here you have population stiinndi ng wn and down the area, The salnsa is the thing witt cornea, again, perhap 1ich we ave most con- boearse of the economic valve. I had better tell you what you are looki nz of at hor (Slice) This is an aerial phototraph of the Columbia River, looking throuzh the water dotm toa sravel bar. sone 330 or 4890 of th th 390 nosts in our lceal areca each yoar, cal al eo) Tho salnon, as you area all well avare, precisely. We get have their homes vory It comes back very nearly to the where it was bora, so v particular srot 31 that vorhars one way we can got at & population analysis -- lacking a bo ex means of collecting fish -- ds to connare the numbers of fish that keer» coming back and spawning in the Colwebia Rivor and in this particular aren.