Here is my thought on it. First off, I have asked to fish peoples ponds and about 2/3s of the time they say yes. When asking I always mention it is a 1 time thing and catch and realese only. Now I do have a few people that let me keep fish and fish anytime but that came with not doing anything stupid and building up their trust. Offering to help out around the pond ( maintain the shore, cut the grass, sink some brush piles etc. ) also goes a long way. As for letting folks fish, It would just depend on what kind of person they seam to be, if they are okay with catch and realese only and If I personally knew them.