There are 6 main types of Hawaiian fishponds described by Kikuchi, and many sub-variants. and there are many great books and scholarly articles about fishponds. But for us, understanding the types of Fishponds uncovers much about the hydrology and the original wetlands that underly almost all fishponds. Many Fishponds were built on natural wetlands, or were designed to mimic wetland-type conditions.
Six-Main-Types-of-Hawaiian-Fishponds (Source, Kikuchi 1973)