Shewanella sp. IRI-160 is an algicidal bacterium isolated from Delaware Inland Bays. It secretes water-soluble compounds that inhibit the growth of dinoflagellates. Previous research indicated that this bacterium does not have a negative impact on other algal species. In this research, Shewanella sp. IRI-160 was immobilized to different porous matrices, including agarose, alginate hydrogel, cellulosic sponge, and polyester foam. The retention of Shewanella sp. IRI-160 on or within these matrices was examined at 4 and 25 °C for 12 days. Results indicated that alginate was superior in terms of cell retention, with >99% of Shewanella cells retained in the matrix after 12 days. Shewanella sp. IRI-160 cells were then immobilized within alginate beads to evaluate algicidal effects on harmful dinoflagellates Karlodinium veneficum and Prorocentrum minimum at bacterial concentrations of 10⁶ to 10⁸ cells mL⁻¹. The effects on dinoflagellates were compared to non-harmful cryptophyte Rhodomonas sp., as well as the effects of free-living bacteria on these species. Results indicated that immobilized Shewanella sp. IRI-160 in alginate beads were as effective as the free-living bacteria to control the growth of K. veneficum and P. minimum, while no negative impacts of immobilized Shewanella sp. IRI-160 on the non-harmful control species Rhodomonas sp. were observed. Overall, this study suggests that immobilized Shewanella sp. IRI-160 may be used as an environmentally friendly approach to prevent or mitigate the blooms of harmful dinoflagellates and provides insight and directions for future studies.

希瓦氏菌 IRI-160是一种从特拉华州内陆湾分离的杀藻细菌。它分泌抑制鞭毛藻生长的水溶性化合物。先前的研究表明，这种细菌对其他藻类没有负面影响。在这项研究中，希瓦氏菌属。IRI-160被固定在不同的多孔基质上，包括琼脂糖，藻酸盐水凝胶，纤维素海绵和聚酯泡沫。保留希瓦氏菌。在4和25°C下检查这些基质上或基质中的IRI-160，持续12天。结果表明，藻酸盐在细胞保留方面优越，在12天后> 99％的希瓦氏菌细胞保留在基质中。希瓦内拉sp。然后将IRI-160细胞固定在藻酸盐珠粒中，以评估在细菌浓度为10 ⁶至10 ^8个细胞mL ^-1时，对有害的鞭毛藻，小叶原核藻和原中心藻的杀藻作用。将对鞭毛鞭毛虫的影响与无害隐藻类红景天菌（Rhodomonas sp。）进行了比较，并将自由生存细菌对这些物种的影响进行了比较。结果表明固定化的希瓦氏菌属。藻酸盐珠粒中的IRI-160与自由生活细菌一样有效，可控制文氏假单胞菌和极小假单胞菌的生长，而固定化没有负面影响希瓦氏菌 IRI-160对非有害对照物种Rhodomonas sp。被观察。总的来说，这项研究表明固定化的希瓦氏菌属。IRI-160可用作防止或减轻有害鞭毛藻繁殖的环保方法，并为今后的研究提供了见识和方向。