Ok guys thought you may be interested in this :
Micropterus dolomieu
(smallmouth bass)
Like other centrarchids, the male will excavate and guard a small, round nest. Suitability for nest-building is maximized between 1-2.5 m in depth, with particle size of substrate near 30 mm (Clark et al., 1998). 1" is 25mm. Several females may spawn in the nest of one male (Etnier and Starnes, 1993). Individual females may also spawn in the nests of several males. (Clark et al., 1998; Etnier and Starnes, 1993)
http://animaldiversity.ummz.umich.edu/site/accounts/information/Micropterus_dolomieu.html Bluegill :
Nest preparation by male bluegills
exposed coarse gravel( 8-32 mm diameter)and pebbles(32-64 mm) in nest substrate and removed particles smaller than 2 mm. Particles larger than 8 mm provided suitable interstitial space to accommodate bluegill larvae. Survival of larvae was directly correlated with the proportion of coarse substrate in the nest.
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