BL - Bonneville White Fish activity?

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Hi Folks - I have read from TD's writeups that Bonneville White Fish are active in the mornings near shore during the spawn. I am wondering if they are also active before sundown as well. From what little I have gathered, they are active in the AM before 11, then bite slows way down. I am guessing afternoons are slow. I have no idea about pre-sunset. I am new to this fishing. Thanks in advance for the info.