Most likely sites selected were near shore , non silt , in water .5 to 3m, near wood ( cribs where available) and larger rocks where nest substrate consisted of gravel/rock where 40% of the particles were 6.4 to 149 mm in diameter ( .27 to 5.9 inches). In a 1m squared area . Coarse rock helped survival of eggs probably because of better O2 and less fungus. From http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=16146&page=7
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