Rectangular troughs are used for hatching fish eggs, coral propagation, baitfish, larval rearing (use with McDonald-type hatching jars), invertebrate holding and many other culture applications. Although not as thick as our reinforced fiberglass tanks, they are still quite durable. Light blue gel coat interior. Troughs are stackable and ship via motor freight, FOB Orlando. Custom sizes available in quantity. Crating charges not included in prices when applicable.