Cladosiphon okamuranus (Chordariaceae, Phaeophyceae) production is an important economic activity in the islands of Okinawa, Japan, and has been unstable for the past decade. Local producers surmise that unstable yields are related to highly localized environmental conditions. We report that the differential yields of C. okamuranus harvested from experimental nets during the 2019 season at two adjacent nurseries (less than 40 m apart), which were designated as a poor or good nursery by local producers, were 137 and 253 kg (wet weight), respectively. In fact, nutrient conditions between the poor and good nursery were slightly different, although involvement of some unsurveyed environmental factors cannot be excluded at present. Additionally, we report on a thallus shearing phenomenon that led to the catastrophic loss of thalli from the cultivation nets.

中文翻译：

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褐藻 Cladosiphon okamuranus (Chordariaceae, Phaeophyceae) 的最终产量可能取决于苗圃质量

Cladosiphon okamuranus（Chordariaceae，Phaeophyceae）生产是日本冲绳群岛的重要经济活动，过去十年一直不稳定。当地生产商推测，不稳定的产量与高度局部化的环境条件有关。我们报告了C. okamuranus的差异产量在 2019 年季节期间，在两个相邻的苗圃（相距小于 40 m）的试验网中收获的重量分别为 137 千克和 253 千克（湿重），这些苗圃被当地生产者指定为不良或良好苗圃。事实上，虽然目前还不能排除一些未经调查的环境因素的参与，但较差和良好苗圃的营养状况略有不同。此外，我们还报告了导致种植网中菌体灾难性损失的菌体剪切现象。