I photographed these salmon alevin for the @NatGeo article, "Was Darwin Wrong?" This is a copy of a #Polaroid that I found in my files. The eggs that are laid in the fall hatch the next spring. The small larval fish, about one inch in length, are called alevin and still have a yolk sac attached. The yolk sac contains protein, sugar, minerals, and vitamins. The alevin live on this "lunch bag" for a month or so before emerging from the gravel and beginning to hunt food for themselves. When the alevin completely absorb their yolk sacs, they leave the gravel and become fry. Alevin that leave the gravel before their yolk sac is completely absorbed are commonly called button-up fry. Salmon face danger throughout their entire lives, from eggs to spawning adults. Gulls, dippers, sculpins, and trout all feed upon salmon eggs and young alevin. The journey that these fish undergo every year is one of the great nature stories of #Migration and #evolution. @robertclarkphoto @natgeo @thephotosociety @instituteartist
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