Two other methods of food gathering.

Sweeping the shallows.
Take a broom or improvise with a leafy branch.
In the shallows rapidly sweep up onto the dry land.
You would really be surprised at the number of minnows you can collect this way.
In the winter with no leaves a T shirt or bandanna can be be used with a bare branch the same way.
When you enter the water you will scare them away. So you will have to wait a few minutes for them to regather.

Second is from Ron Hood's video.
The Apache throwing star.
Take two sticks about 8 to 10 inches long pencil to thumb sized thickness.
Sharpen all 4 ends.
Tie together to form an X.