you have to purchase the appropriate tech for the villagers to fish...but first they have to farm
there are still puzzles that builders can solve for you to improve their skill, but they will also continue to increase it by fixing the huts (regardless of the fact that there is no damage)
_________________________
Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?