If you drop a villager into the ocean they will automatically fish (if they have farming skills). However, if you do not have level 3 farming tech, they will not know what to do. Until you have researched farming fully... no fishing!
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My VV2 story, "A Twist of Fate"
And don't miss Krystal's stories, all three of them!
"Life is too fast... unless you're in traffic."