In a blender, mix lime juice, soy sauce, honey, vegetable oil, garlic, ginger and sesame oil on high for 10 seconds.
In a bowl, combine radishes and carrots with ½ cup of lime juice mixture. Toss and refrigerate for 15 minutes.
Combine mayonnaise, Sriracha and lime juice in a small bowl to make Sriracha Aïoli.
Scoop out ½ inch from inside each piece of bread. Spread each piece of bread with Sriracha Aïoli, and place thin-fried catfish on half of bread.
Drain vegetable mixture, and arrange on top of fish. Place cucumber slices and cilantro over vegetables, and top with other half of bread.