There may be smaller ones, this one was purchased in the early 90's. But the basic idea of it is to draw a larger volume of water into a cylinder of a certain circumference, through an opening of smaller dimentions than the cyl. The opening size will determine the size of fish you can collect. Mine is very long, and allowed for multiple fish to be collected at the same time, hence the longer tube...hopefully for your situation, they have smaller ones.

Good luck.