Abstract:The decadal biodiversity variations of ichthyoplankton collected at the same locations of the Laizhou Bay of the Bohai Sea in 1982, 1993, 2003 and 2008 were studied. The analyses indicated that the total number of ichthyoplankton species declined from 27 in 1982 to 12 in 2003 and 14 in 2008. The ichthyoplankton abundance also declined substantially, with the amount in 2008 accounting for only .58% in 1982, 0.61% in 1993 and 5.77% in 2003 respectively.Ichthyoplankton composition was significantly different in three decades (P<0.05), and showed accelerating change trend. The biodiversity index was at the lowest in 1993 and increased ever since.
