Bski - Sunil describes SMB spawning in locations very similar to those I have observed numerous times, especially when optimum substrates are lacking. Sunil said: "I have seen my smallies spawning on a steep bank (leading down into deep water) that has a 1' wide flat ledge just about 1' under the water (the water level can fluctuate to where this area would be 2-3' under water). It's very rocky there too."" Also consider that the individuals that Sunil has described may be subdominant males that are spawning in seconday locations while the most dominant males could be in the prime locations with optimum substrates. Sunil has a fishery with mature large SMB. For examples of optimum substrates that have been gleaned from research papers refer to ewests post.
I will post more later from a remote location (Christmas visit) about catfish, revisit the BG issue, and discuss snails & YP.
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