animals are attracted to the fish emulsions but generally they do not stay interested long. what i have done in the past is start puttung emusions, guanos, blood meal that sort of thing out in my plots a month or so before i plant. the animalls (racoons love doing this) will dig around looking for what smells after not finding anything a few times they tend to leave it alone.
yes a small fenc is another option along with pissing around (not on) your plants. i will have to say being the sick guy i am i piss in a gallon jug for a day let it set and stink then dumb in in surrounding area it works well. but having it break open in your backpack in no fun.