In case you mean for how much Bells you can sell them, I'd say something under 20.
You can find a list of all the bugs, how much they sell for, and where and when to get them at this site: http://accf.wikispaces.com/Bugs
There are 218 total.
There are 56 different types of bugs on Animal Crossing Wild World and if you catch all of them, you get a Golden Net that is three times the size of a regular net, therefore it is much easier to catch a bug. Hope this helped!
No you can only catch bugs and fish
There is many bugs/insects on Animal Crossing and the link Below will help you see what you can catch.
Check the link below for a list of Bugs/Insects on Animal Crossing City Folk
Catch all bugs.
go on animal crossing official site and it gives you prices for all fish, all bugs and basically everything you need to know.
You can sell fish. You can also catch bugs.
sell fish, bugs, shells and fruit
You can catch bugs any time in AC:WW. All you need is a net, fast reflexes (or not), and you're all set!
It is just bigger so that it is easier to catch bugs!