Spear fishing

Do you like fish sticks?
''Strange animals live in the water. Tasty ones, if we managed to catch them for they move too swiftly for our piggy hands. Maybe we could throw sticks like we hunt beasts in the wilderness to catch them, if we can master this skill!''

Potential Requirements

 * You'll likely get it if you have a river or shoreline on the map of one of your cities.
 * Triggers even if the map has no fish on it but has water.
 * Can potentially trigger before javelin's are unlocked.