Suitability of environment was studied in sea cucumber Apostichopus japonicus based on a habitat suitabil-ity 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.%为了评价刺参Apostichopus japonicus生存环境的适宜度,基于动物栖息地适宜度指数( Habitat suita-bility index, HSI)模型,对刺参的环境适宜性进行了研究。选取温度、盐度、溶解氧、底质环境类型和底质砂砾含量作为影响刺参适应性的环境因子,根据经验赋值法和数理统计方法,绘制了大长山海域刺参各影响因子的适宜性指数(Suitability index, SI)曲线图,并利用几何平均法综合估算 HSI值。结果表明：2013—2014年7个航次调查的HSI平均值分别为0.66、0.59、0.67、0.46、0.66、0.65、0.65,冬季的适宜度(HSI=0.46)明显低于其他季节,而春季(HSI=0.66)及秋季(HSI=0.67, HSI=0.65)的适宜度相对较高；同一航次中(以2014年11月为例),7个站位的 HSI 值分别为0.66、0.67、0.65、0.62、0.63、0.62、0.67,其中DCS01、 DCS02和DCS07站位的适宜度较高。研究表明,春季及秋季在DCS01、DCS02和DCS07站位进行刺参苗种底播,刺参的成活率和生长情况可能更好。
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