Finished net currently can be used only in quest. After finishing this quest village's piers would be improved and Alice start trading fish and items made of fish. And it's trout in 9.1 build but in 9.4 I've changed it to carp.
Yeap, you can craft bear meat (same as wolf meat) and cook eggs. You can buy some recipes from Alice/Malagdaer/Shaartan or find on game level.