请从学术的专业角度翻译这段话在考虑到南方海胆品种人工养殖尚存空白以水产养殖学本科知识学习的理论为基础从实用性角度出发采用对照实验的方法为初步建立杂色角孔海胆Salmacis sphaeroides的人工培育技术本实验以杂色角孔海胆为材料经历海胆的催产和幼体在梯度盐度海水下的养殖探究了盐度对杂色角孔海胆幼体生长发育的影响。在设置的六个盐度梯度20、24、28、32、36、40中盐度28到32区间内杂

Considering the current void in the artificial breeding of southern sea urchin species, based on the theoretical knowledge of aquaculture at the undergraduate level and from a practical perspective, this study employs a comparative experimental method to preliminarily establish the artificial cultivation technology of Salmacis sphaeroides. Using S. sphaeroides as the material, this experiment investigates the influence of salinity on the growth and development of S. sphaeroides larvae through the induction of sea urchins and the cultivation of larvae in seawater with gradient salinity. Among the six salinity gradients (20, 24, 28, 32, 36, and 40), the best growth and development of S. sphaeroides occurred within the salinity range of 28 to 32.