In a medium bowl, combine the bass, lime juice, orange juice, salt and red onion. Cover in plastic wrap and refrigerate for at least 1 hour and up to overnight.
Meanwhile, bring a large pot of salted water to a boil over high heat and prepare an ice bath. Add the shrimp and boil until just cooked, 1 minute. Transfer to the ice bath to cool. Once completely cool, drain and toss with olive oil and orange juice. Season with salt.
Make the cocktail sauce: In a blender, puree all the cocktail sauce ingredients until smooth.
Assemble the veuva la vida: In a large bowl, toss together the marinated fish, marinated shrimp, crab meat and ½ cup cocktail sauce to incorporate. Cover in plastic wrap and refrigerate for 1 hour.
Add the cucumber, cilantro, parsley, scallions and avocados to the bowl and toss to coat. Transfer to a bowl and garnish with grated fresh horseradish, then serve with tortilla chips.