Ecological studies on barnacle Balanus rostratus as a new species for aquaculture

藤壶Balanus rostratus作为水产养殖新物种的生态研究

• 批准号: 06660251
• 负责人: KADO Ryusuke
• 金额: $ 1.22万
• 依托单位: Kitasato University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06660251/
• 关键词: Balanus rostratus; Settlement depth; Growth; Survival; Distribution; Effect of temperature; Larval diet; Grazing rate; 大量飼育; ペニス長; 成長速度; 生殖サイクル; 付着基質

1. Settlement depth and growth in the seaSettlement was most frequent at the depth of 10m among 5,10,20,30, and 40m in the Mutsu Bay, northern Japan. Barnacles at 10 and 20m in depth grew bigger than the ones at 5m for 15months. Newly settled (1993) and one-year old (1992) classes of barnacles were transplanted and kept for more than two years in Okirai Bay, north-eastern Japan. They grew 32mm in basal diameter for the former and 42mm for the latter after 2 years. This means it takes 3 or 4 years to grow 42mm in size in Okirai Bay.2. Effect of water temperature on the barnacle growthThe lower the temperature, the bigger newly attached barnacles grew and the more they survived for 200 days among 10,15,20, and 25ﾟC temperature regimes. One-year class barnacles showed the same response to the temperature as those of the 0-year class. Barnacles in 20ﾟC regimes showed gradual decrease in survival. The results show that a temperature lower than 15ﾟC is desirable for this species to sustain their population.3. Distribution of larvaeCyprid larvae had already appeared in mid February, and only a fewnaupliar larvae were found in March. Cyprids tended to appear more in the Eastern half of the Mutsu Bay rather than in the Western half of it.4. Larval rearing and their grazing ratesDiatoms Asterionella japonica and Thalassiosira nordenskioeldii supported good growth of larvae under 10-12ﾟC,1-2 larvae/ml, and irrespective of light. Stirring was needed to scatter the larvae by aeration or by propulsion. Grazing rate to A.japonica was increased with growing the larva from 300 cells/nauplius/h (stage II) to 1700 (stage VI).5. Artificial substrate for settlingBarnacles were settled on poly vinylchloride (PVC) and rubber plates among seven different artificial substrata tested. A used tire would be a good substratum not only for settlement but also removing barnacles from it.

1. 沉降深度和海中增长日本北部陆奥湾的5、10、20、30、40m深度中，沉降最频繁发生在10m深度。 10 和 20m 深度的藤壶在 15 个月内比 5m 深度的藤壶长得更大。新定居（1993年）和一岁（1992年）的藤壶类被移植到日本东北部的Okirai湾并保存了两年多。 2年后，前者的基径增长了32毫米，后者的基径增长了42毫米。这意味着 Okirai Bay 需要 3 到 4 年才能长到 42 毫米。2。水温对藤壶生长的影响温度越低，新附着的藤壶生长得越大，在10℃、15℃、20℃、25℃温度条件下200天存活率也越高。一年级藤壶对温度的反应与零年级藤壶相同。藤壶在 20°C 条件下的存活率逐渐下降。结果表明，低于15℃的温度是该物种维持其种群数量的理想条件。3．幼虫分布 2月中旬已出现鲤鱼幼虫，3月份仅发现少量无节幼虫。鲤鱼多出现在陆奥湾的东半部，而不是西半部。4．幼虫饲养及其放牧率硅藻Asterionella japonica和Thalassiosira Nordenskioeldii在10-12°C、1-2个幼虫/ml且不受光照影响的条件下支持幼虫良好生长。需要通过通气或推进来搅拌以驱散幼虫。随着幼虫的生长，粳稻的放牧率从300个细胞/无节幼体/小时（阶段II）增加到1700个（阶段VI）。5．用于沉降的人造基质 在测试的七种不同的人造基质中，藤壶被沉降在聚氯乙烯（PVC）和橡胶板上。旧轮胎是很好的基质，不仅可以用于沉降，还可以清除其中的藤壶。