We spotted these two fish-themed Mardi Gras floats Sunday during a walk around Uptown. They are stored in a nondescript warehouse. The workers wheeled them to the street and put them back inside in less than 10 minutes. #mardigrasninjas
This one looks like it relates to Poseidon/Neptune:
This Mardi Gras float was spotted Sunday on Bordeaux Street in New Orleans. (photo by Carlie Kollath Wells/New in NOLA)
Not sure what this big, toothy fish one is, but it looked cool:
This Mardi Gras float was spotted Sunday on Bordeaux Street in New Orleans. (photo by Carlie Kollath Wells/New in NOLA)
This Mardi Gras float was spotted Sunday on Bordeaux Street in New Orleans. (photo by Carlie Kollath Wells/New in NOLA)
New in NOLA 
Ah ha! I’m pretty sure the first float with the clam shell is for the Krewe of Proteus. Proteus is the son of Poseidon.
http://www.kreweofproteus.com/2010-Krewe-of-Proteus/pages/Krewe-of-Proteus-2010-Mardi-Gras-New-Orleans-9587.php
Also learned that these warehouses are called dens.