营养条件对海蜇螅状体形成足囊及足囊萌发的影响

用卤虫(Artemia)无节动体作为海蜇(Rhopilema esculenta)螅状幼体的饵料,按不同投饵频次划分为7个营养水平,考察不同营养水平对海蜇螅状体形成足囊及足囊萌发的影响。结果表明,营养条件不仅对螅状体形成足囊的数量有直接影响,而且对足囊萌发也有明显的间接影响。在具备丰富的营养条件下,螅状体形成足囊活跃,个体大,易于萌发;缺乏营养则抑制足囊形成,即使形成足囊,个体也小,不萌发或萌发率很低。

EFFECT OF NUTRITIONAL CONDITION ON THE FORMATION AND GERMINATION OF THE PODOCYST OF SCYPHISTOMAE OF RHOPILEMA ESCULENTA KISHINOUYE

The scyphistomae of Rhopilema esculenta were cultivated underdifferent nutritional conditions in laboratory. Seven groups were divided, and fedwith freshly hatched naupill of Artemia sp. Feeding intervals were 1,2, 4, 7, 14, 21and 28 days for each group respectively. The effect of nutrition on the formationand germination of the podocyst were observed. The scyphistomae produce 7.4 po-docysts on the average under feeding each day, and germinating rate can reach28.6%. In lack of nutriment, the formation of podocyst is inhibited or very few.The scyphistomae would produce only 1.1 podocysts on the average under malnutri-tion, and germinating rate is scarce or unable to germinate. It indicates that thenumber of podocyst formed and germinating rate are closely related to nutrientlevel of scyphistomae.