Abstract: Suitability of environment was studied in sea cucumber Apostichopus japonicus based on a habitat suitability index（HSI）model.The suitability index（SI）value and HSI values of sea cucumber in Dachangshan waters，temperature，salinity，dissolved oxygen，sediment environment and percentage content of sediment sand and gravel as factors，were estimated by experience value assignment method，mathematical statistics method，and geometric average method.It was found that the average of HSI values were 0.66，0.59，0.67，0.46，0.66，0.65 and 0.65 in 7 voyages from 2013 to 2014，significantly lower in winter（HSI=0.46）than in other seasons，and relatively high suitability in spring（HSI=0.66）and autumn（HSI=0.67，HSI=0.65）.In the same voyage，November 2014，for example，the HSI value at each station was 0.66，0.67，0.65，0.62，0.63，0.62 and 0.67，with high suitability at DCS01，DCS02 and DCS07 positions.It is suggested by the calculation that sea cucumber be released at DCS01，DCS02 and DCS07 in the spring and autumn.
2016, Vol. 31 
