What should i use if im fishing above a river?

after it rains or soak the grass with a hose,grab a flashlight and a container . when its dark walk slow and shine the light on the ground . when you see a night crawler put your finger over the hole he is coming out of ,pull slow or you will break the worm . you can get penty out of your own backyard. .the head come out first ,you will see after u catch a couple