基于有性繁殖的鼠尾藻规模化繁育试验

2007～2009年间,先后在威海小石岛开展了两次鼠尾藻的规模化人工育苗试验,在威海周边和青岛开发区海域进行了3次保苗实验。两年育苗的试验规模均为10个育苗池(规格一致,均为2m×5m)和部分备用池。所用种菜主要在威海附近的多个海域采集,其中以小石岛采集的种菜最为理想。通过6种常见附着基的对比试验,附着基以竹帘附苗密度最高,操作方便和附苗量结合理想的附着基是织带帘。平面基质上的附苗密度最大,达到30株/cm2。2007年出幼苗750.7万株,平均苗长3.5mm;2008年出幼苗3015.42万株,平均苗长3.2mm。本试验发现,鼠尾藻幼苗早期发育中,幼苗附苗较均匀,但生长到4mm后,幼苗有大面积脱落的现象,随着日后的生长,苗种密度也逐渐下降,到10mm时密度降低到0.2～1.0株/cm2。

Large scale breeding of Sargassum thunbergii based on sexual reproduction

Two trials for Sargassum thunbergii seedling production and three times seedling nursery were conducted between 2007 and 2009 in Xiaoshidao of Weihai and Xuejiadao of Qingdao in Shandong Province. About 10 concrete ponds were employed as seedling production facilities, each with 2×5 m2. Parent strains were collected from different sites in Weihai, and it was proved that the local strain in Xiaoshidao was better for seedling production than the other S. thunbergii collected. Six types adherences substratum were used for seedling adherence, and it was indicated that bamboo curtain was the most efficient one, which yielded over 30 ind./cm2 of seedling densities. The total yielded seedling was 7,507,000 individuals in 2007, with average of 3.5 mm in length; while in 2008, it was 30,154,200 individuals with 3.2 mm in length. Early developmental observation showed that S. thunbergii seedlings owned higher survival rate and went through the normal development, but seedlings may be detached from the substrate when reached to 4 mm in length.The seedling density decreased to 0.2~1.0 ind./cm2 when the seedling length reached to 10 mm.