Chang has more than 100,000 shell specimens in his collection, including common nautiluses (Nautilus pompilius); Teramachi's cowries (Cypraea teramachii) and Joyce's cowries (Cypraea joycae), which can be worth as much as a car; and Rumphius 'slit shells (Entemnotrochus rumphii), which appeared on the planet earlier than the dinosaurs. He also keeps more than 30 different species of mollusks in aquariums.
坐擁 10 萬顆以上的貝殼標本，張議顯的收藏，包括出現年代早過恐龍的龍宮貝、鸚鵡螺，價值一輛轎車的寺町寶螺、柔姬寶螺，還有養在水族缸的三十多種貝類活體。