Cook pasta in boiling water according to package instructions or until firm to the bite. Rinse with cold water. Drain and place in serving bowl.
In medium nonstick skillet sprayed with vegetable spray, saute seafood just untill cooked, approximately 3 minutes. Set aside.
Add red and green peppers, onions, carrots and green onions to pasta. Add seafood.
Make the dressing: In small bowl combine yogurt, mayonnaise, dill, lemon juice, garlic and mustard. Pour over pasta. Toss and chill
TIPS: firm fish filets can be used with or instead of mxed seafood. Be careful not to over cool. Grilled fish instead of sauteed makes an excellent variation.
MAKE AHEAD: Pasta salad and dressing can be prepared early in day. Do not toss untill ready to serve.