Had a nice chat with the county game warden today. Game camera footage & trespassing signs are helpful, though not absolutely necessary to convict poachers. Purple stripes at eye level on trees serve as valid markers of property line, too.

He said that, unlike a criminal case, bad intent need not be proven, just that any reasonable person would understand they were trespassing. Promised to add our property to their patrol, which I appreciate. I'd prefer not to prosecute, just to deter, but if it takes jail and/or hefty fines pour le encourager les autres, so be it. We've invested far too much time, effort, and money to let thieves steal fish!