Traditionally , oysters are cultured by the bottom culture method with spat collected by laying rock , concrete tile or post as cultch on the mud flat in may or june . the oyster spat takes four to five years to grow to marketable size 传统上，香港养蚝都是使用海底养殖法，在5月或6月间在泥滩上放置石块、瓦片或柱杆作为附器收集蚝苗，这些蚝苗要生长4至5年才可收成售卖。
