Growing Ulva (Chlorophyta) in integrated systems as a commercial crop for abalone feed in South Africa: a SWOT analysis
Growing Ulva (Chlorophyta) in integrated systems as a commercial crop for abalone feed in South Africa: a SWOT analysis
复制标题
DOI：
10.1007/s10811-008-9385-6
复制
发表时间：
2009-10-01
影响因子：
3.3
通讯作者：
Kandjengo, L.
中科院分区：
文献类型：
--
作者：
Bolton, J. J.;Robertson-Andersson, D. V.;Kandjengo, L.
2007年，南非鲍鱼养殖场种植了1000多吨鲜重的石榴，主要用于饲料，但有一次是为了通过去除营养物质进行部分再循环。分析了这种新的经济作物的潜力。材料来自自然自由漂浮的种群，至少有四个物种是共同种植的，具有不同的生态生理特征。一种棕色附生植物--奇异Myrionema strulans--引起了一种石榴病，目前由农民通过重新放养的方式进行管理。主要的潜在威胁是，一些农民对集成系统持谨慎态度，担心它们可能会在鲍鱼身上传播疾病，尽管Ulva已经在一个农场的鲍鱼废水中种植了6年，并反馈给鲍鱼，没有任何不良影响。通过进一步推广鲍鱼产业，在拟议的养鱼活动中包括海藻航道，或在水产饲料中纳入高质量栽培的石榴树，存在扩大石榴树种植的机会。这些跑道系统全年的产量保守估计为26.1g干重m(-2)天(-1)(2006年)和19.7g干重m(-2)天(-1)(2007年)，与室外系统微藻年总生物量的最大数字相似。
Over 1,000t fresh weight of Ulva was cultivated on South African abalone farms in 2007, primarily for feed, but in one case to allow partial re-circulation by nutrient removal. The potential of this new commercial crop is analysed. Material is collected from natural free-floating populations and at least four species are commonly grown, with different ecophysiological characteristics. A brown epiphyte, Myrionema strangulans, causes a disease of the Ulva, which is currently managed by farmers by restocking. The main potential threat is that some farmers are wary of integrated systems, fearing they may promote disease in abalone, although Ulva has been grown in abalone effluent and fed back to the abalone on one farm for 6 years without adverse effects. Opportunities exist for the expansion of Ulva cultivation via further spread of the abalone industry, the inclusion of seaweed raceways in proposed fish-farming activities, or the potential for the inclusion of high quality cultivated Ulva as a constituent in aquafeed. A conservative estimate of production over a full year from these raceway systems was 26.1 g dw m(-2) day(-1) ( 2006) and 19.7 g dw m(-2) day(-1) ( 2007), similar to maximum figures for total annual microalgal biomass production in outdoor systems.