How many fingers is it suitable to catch grass carp with a sticky fishing net?

I often fish in the river, and I have done it in actual combat. The 8-finger net generally has about 2 kg of fish, and the 9-finger net has more than 2-3 kg. Of course, I may catch a big fish weighing more than 10, but according to the resources, Jiuzhi.com is generally sold online, with more carp and less grass carp. It is said that grass carp will be caught with a special sticky net.