Abstract: In order to explore the artificial cultivation technology of Sargassum polycystum, raft culture of S. polycystum was conducted during March to June, 2015 in Haitou Town of Danzhou city, Hainan Province. The growth rhythm of S, polycystum was recorded, and the effects of different cultivation conditions including water depth and culture density on growth were compared. The results showed that the cultured S, polycystum grew very fast from late-March to late-May, the length increased markedly before middle-April, while the weight kept increasing at a relative stable rate until the end of May. The algae length and branch number were influenced significantly by water depth and culture density respectively, while the fresh weight was obviously influenced by both of the above factors (P<0.05). This study indicated that properly increasing the water depth and choosing rational density could effectively promote the growth of S. polycystum. To increase the yield, the water depth should be set at around 80 cm, and the densities would be better set at 10 cm.

Key words: brown algae, Sargassum polycystum, cultivation, growth, depth, density

摘要： 为探索匍枝马尾藻（Sargassum polycystum）的人工栽培技术，采用浮筏式栽培方式于2015年3—6月在海南省儋州市海头镇进行了匍枝马尾藻的人工栽培试验，记录了该藻的生长规律，并通过栽培水深和夹苗密度试验，比较了不同栽培条件对其生长的影响。结果显示，3月下旬至5月下旬为匍枝马尾藻生长最旺盛的季节，其中藻体长度的快速增长主要集中在4月中旬以前，而藻体重量以相对稳定的速率持续增长至5月下旬。栽培水深和夹苗密度分别对匍枝马尾藻的藻体长度和分枝数有显著影响，而藻体鲜重则同时受到这两个因素的影响（P<0.05）。研究表明，适量增加匍枝马尾藻的栽培水深和控制夹苗密度有利于促进其生长；为有效提高匍枝马尾藻的产量，栽培水深应设计为80 cm左右，夹苗密度控制在10 cm左右。

关键词: 匍枝马尾藻, 栽培, 生长, 水深, 密度