Various fishing nets are available on the market, each designed for a specific purpose. The most common sizes of fishing nets used for boat fishing are: -6 feet long x 3 feet wide -8 feet long x 4 feet wide -10 feet long x 5 feet wide The net size you need will depend on the type of fish you are targeting. For smaller fish, a 6-foot net may be sufficient. For larger fish, you will need an eight or 10-foot net.