The invasive freshwater hydromedusa Craspedacusta sowerbii Lankester, 1880 (phylum Cnidaria, class Hydrozoa, family Olindiidae) is native from East Asia but for more than 20 years, reports of this species have been increasing in Europe, North America, and Australia. Due to the sporadic presence of the medusa stage and difficulties in the sample polyp stage, there is a lack of data on the physiological parameters of C. sowerbii and its potential impact. We present data on growth and ingestion rates of the medusa stage measured at 29°C, temperature at which polyps are maintained in the Cinéaqua Aquarium (Paris). Medusa growth increased from 0.60 ± 0.08 to 9.0 ± 2.1 mm (mean: 0.28 ± 0.26 mm d⁻¹), and gonads appeared after 11.5 ± 3.0 days. Ingestion rates increased significantly from 28 ± 16 prey ind⁻¹ d⁻¹ (<1 mm) to 442 ± 170 prey ind⁻¹ d⁻¹ (>7 mm).

中文翻译：

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淡水海Cra Craspedacusta sowerbii的生长和摄食率

入侵性淡水水生水母Craspedacusta sowerbii Lankester，1880年（刺花科，Hydrozoa类，,科）起源于东亚，但是20多年来，欧洲，北美和澳大利亚对该物种的报道不断增多。由于美杜莎阶段的零星存在和样品息肉阶段的困难，缺乏关于梭氏梭菌的生理参数及其潜在影响的数据。我们介绍了在29摄氏度（Cinéaqua水族馆（巴黎）中维持息肉的温度）下测得的美杜莎阶段的生长和摄食率的数据。美杜莎的生长从0.60±0.08毫米增加到9.0±2.1毫米（平均：0.28±0.26毫米d ^-1），性腺在11.5±3.0天后出现。摄食率从28±16个猎物ind ^-1 d ^-1（<1 mm）显着增加到442±170个猎物ind ^-1 d ^-1（> 7 mm）。