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<br />L Vll Littoral spawning 1.0 <br /> substrate. <br /> x <br /> A. Clay, silt, very Q) 0.8 <br /> -c <br /> fine sand (< 0.25 c <br /> ...... <br /> mm), 51 = 0.05. >, 0.6 <br /> B. Medium to coarse +-> <br /> .,... <br /> sand (0.25 to 1 mm), .,... 0.4 <br /> SI = 0.7. ..c <br /> ro <br /> C. Very coarse sand +-> <br /> .,... <br /> (1 to 2 mm), SI ~ 0.2 <br /> = Vi <br /> 1.0. <br /> D. Gravel-granule 0.0 <br /> (2 to 4 mm), SI = <br /> 0.9. A B C 0 E F <br /> E. Gravel-small <br /> pebble (4 to <br /> 16 mm), SI = 0.5. <br /> F. Pebble (large), <br /> cobble, boulders, <br /> (> 16 mm), SI = <br /> 0.05. <br /> Adjust SI according to <br /> mixture of substrate <br /> sizes, by judgment. <br /> (Substrate categories . <br /> adapted from Cummins <br /> 1962; Cummins and <br /> Lauff 1969). <br /> <br />14 <br /> <br /> <br />. <br />