This is a list of all bugs and where the rocks which you can find them under are:
Azure Bug: In the Raw Food area and Vine area.
Black Bug: In the Raw Food area, Vine area, Canoe End area and Easel area.
Blue Bug: In the Raw Food area and Canoe End area.
Brown Bug: In the Sewing area.
Fuchsia Bug: In the Vine area rock.
Green Bug: In the Vine area and the Easel area.
Jade Bug: In the Easel area.
Orange Bug: In the Sewing area and Easel area.
Pink Bug: In the Vine area.
Purple Bug: In the Canoe End area.
Red Bug: In the Canoe End area.
Tan Bug: In the Sewing area.
Turquoise Bug: In the Sewing area.
White Bug: In the Raw Food area and Canoe End area.
Yellow Bug: In the Sewing Area and Easel area.
Make sure you don't let your Sim faint too much because you will loose a lot of your items.
Most of the time the lost items aren't very rare but you never know what just might disappear.
To find the pufferfish go to were you washed up on island at the start off the game at noon when the sun is at it's bright's, the fish has teeth like thing's at the top off it's head and it's brown in colour.
Give these items to the other people on the Island to keep them happy.
Chef Butcher: Zucchini and Eggs.
Ms Weeder: Bananas.
Dr. Feelgood: Nothing as she is always happy.
Suzy McDress: Chocolate Bar, Soda and Cheese.