Excerpt from Success of Pink Salmon Spawning Relative to Size of Spawning Bed Materials Permeability of bottom materials is prob ably an important factor limiting fry production in spawning beds. It has been shown how permeability is related to size composition of bottom materials, and it is possible to compare relative permeability of spawning beds by determining average size composi tion. Hence, a simple and direct method of measuring physical properties of spawning beds pertaining directly to their capacity to produce fry has been provided through develop ing techniques for measuring size composi tion of bottom materials. Pronounced differences in size composition of bottom materials were observed among several pink salmon spawning streams. The more productive spawning streams had the highest permeability coefficients. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.