Eucheumatopsis isiformis Núñez-Resendiz, Dreckmann & Sentíes is a red alga with great economic potential due to its iota-carrageenan content that could serve as a substitute for traditional carrageenan sources (Freile-Pelegrín and Robledo, J Appl Phycol 20:537–541, 2008) such as the red alga Kappaphycus alvarezii (Loureiro et al., New Phytol 206:489–492, 2015), if it can be reliably and sustainably cultivated in open water. Due to prevailing and changing climatic conditions, it is necessary to retain germplasm and to cultivate this alga in tank systems. To develop the necessary, large volumes of seed stock required for stocking open water cultivation farms, three brown seaweed-derived biostimulants were tested. One of these was manufactured from the kelp Ecklonia maxima, the other two were manufactured from the intertidal fucoid Ascophyllum nodosum. Apical segments of E. isiformis were treated either by dipping or by continuous exposure to the biostimulants, at different concentrations. Growth was assessed every seven days by measuring the maximum length of each segment, number of lateral shoots produced by each shoot, fresh weight, and the maximum diameter. The constant exposure treatment produced a greater number of shoots per propagule with no significant effects driven by any of the biostimulants. Increasing or decreasing the concentration of the biostimulants to improve the performance of the dipping protocol was not effective, as compared with a constant exposure protocol. This study supports the increasing number of research articles related to the positive benefits of using macroalgal-derived extracts as biostimulants to support seaweed cultivation.

Eucheumatopsis isiformisNúñez -Resendiz，Dreckmann和Sentíes是一种具有巨大经济潜力的红藻，因为它的iota-角叉菜胶含量可以替代传统的角叉菜胶来源（Freile-Pelegrín和Robledo，J Appl Phycol 20：537-541， 2008年），例如红藻Kappaphycus alvarezii（Loureiro等人，New Phytol 206：489-492，2015），前提是可以在开放水中可靠且可持续地进行养殖。由于普遍和不断变化的气候条件，有必要保留种质并在罐体系统中培养这种藻类。为了开发放养开放水域养殖场所需的必要的大量种子库，对三种褐藻衍生的生物刺激剂进行了测试。其中之一是从海带Ecklonia maxima制造的，另外两个是由潮间岩藻类结节藻制成。的心尖段E. isiformis通过浸入或通过连续暴露于不同浓度的生物刺激剂来对它们进行处理。通过测量每个节段的最大长度，每个枝条产生的侧枝数，鲜重和最大直径来评估每七天的生长。持续暴露处理使每个繁殖体产生大量芽，而没有任何生物刺激剂产生明显影响。与恒定暴露方案相比，增加或降低生物刺激剂的浓度以改善浸渍方案的性能是无效的。这项研究支持越来越多的研究文章，这些研究文章涉及使用大藻类提取物作为生物刺激剂来支持海藻种植的积极益处。