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.
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