The preliminary study on nanodiatom in the Taiwan Strait was carried out using transmis- sion electron microscopy (TEM) in February 1995. Thirty-three species of nanodiatom (<20 μm) were identified, among which, 6 were new recorders in China. The dominant species were Minidiscus comicus Takano and Thalassiosira tenera Proschkinae-Lavrenko in the northern Taiwan Strait (NTS), Minidiscus trioculatus (F. J. R.) Hasle and Navicula climacospheniae Booth in the southern Taiwan Strait (STS). Abundance of nanodiatom was much more than that of microdiatom (>20 um), and the Abundance of nanodiatom in NTS is higher than that in STS. The highest abundance of nanodiatom was At the depth of 10 m of N_330 in NTS, while at the depth of 20 m of S_105 in STS. The vertical distribu- Tion of nano- and micro-diatom of NC1 showed that the peak was at the depth of 30 m.
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