Looks like a courtbouillon, (fish soup) Fish isn't used in gumbo thats sold here in restaurants or on most full blooded cajun family tables.
You will allways find any combo of these meats:
(normaly 2 sometimes 3 meats)
crab, shrimp, ersters, chicken, sausage, gator, duck.
Deer thats not Q'ed or made into sausage would be done sauce piquant style, turtle too but also turtle soup & stew. I'm not tryin to start an argument cause you could put anything you want in a gumbo. Certain combos accentuate the flavors of each other more without making the flavor too complex, Like chicken & sausage & duck & sausage for example.
You allready have Umami with the roux & trinity.