| 摘要: |
| 采用现场测定方法, 研究了硬壳蛤稚贝野外中间培育的适宜初始规格以及直接底播、袋中加砂底播、袋中加砂笼养和袋中无砂笼养4种野外培育模式的效果。结果表明, 硬壳蛤稚贝进行野外中间培育的适宜规格为壳长大于2—4mm。在4种培育模式中, 直接底播和袋中加砂底播模式效果比较理想。直接底播的稚贝(3000粒/m2)经过28天便可由壳长2.62mm长到9.47mm, 达到播种规格；经过62天的培育可以长到17.51mm, 成活率可达83.3%。利用袋中加砂底播模式培育的稚贝生长速度略低于直接底播的稚贝, 但成活率略高于直接底播的稚贝, 可达到89.8%—94.5%。与上述两种培育模式相比, 袋中加砂笼养和袋中无砂笼养模式培育的稚贝生长速度较慢, 其中以袋中无砂笼养模式培育的稚贝生长速度最慢, 成活率最低。在这两种培育模式中, 下层稚贝生长最慢, 其次为中层稚贝, 再次为上层稚贝。
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| 关键词: 硬壳蛤,中间培育,模式 |
| DOI：10.11693/hyhz200306009009 |
| 分类号: |
| 基金项目:国家“863”青年基金项目,2001AA628040号;山东省科技兴海项目(2002.01—2004.12)“硬壳蛤工厂化育苗与养殖产业化开发”的部分成果;青岛市重大科技项目“硬壳蛤工厂化人工育苗与示范”(2003.01—2005.12)的部分成果 |
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| PRIMARY STUDY ON MODES OF SEED HARD CLAM MERCENARIA MERCENARIA (LINNAEUS, 1758) CULTURE IN FIELD |
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ZHANG Tao, YANG Hong-Sheng, LIU Bao-Zhong, LIU Ying, WEN Hai-Xiang, LIU Shi-Lin, ZHANG Fu-Sui
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Institute of Oceanology, The Chinese Academy of Sciences
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| Abstract: |
| The hard clam, Mercenaria mercenaria (L.), is distributed from the Gulf of St. Lawrence to the Gulf of Mexico from a depth of 15m to the intertidal zone. The culture of hard clam has a good future since introduced firstly from the United States to China by Institute of Oceanology,The Chinese Academy of Sciences, in 1997. The intermediate culture process is an important stage in the seed culture of hard clam. There are many methods for intermediate culture of hard clam, such as using raceway system, upflow system, downflow system and rafts, trays, cages, nets infield. In this paper, we determined the optimal original size of juvenile hard clam to begin the seed culture process in field and studied the four seed culture modes in field, i.e. sowed the seed in sand directly (mode 1), cultivated in bags with sand (mode 2), cultivated in bags with sand put in cage (mode 3), cultivated in bags without sand put in cage (mode 4). Our results suggested that the 2—4mm juvenile hard clam suit seed culture in field. Among the four modes, mode 1 and mode 2 are the better modes for seed culture in field. The juvenile hard clams cultured in mode 1 (3000 clams/m2) could grow from 2.62mm to 9.47mm after 28d, which achieved the plantable size. After 62d, the juvenile hard clams could grow to
17.51mm, which the survival rate is 83.3%. The growth rate of seed hard clam cultivated in mode 2 is lower than that of mode 1, but the survival rate is higher than that of mode 1, which are between 89.8%—94.5%. Compared with these two modes above, the growth rates of seed hard clam cultivated in mode 3 and mode 4 are relatively low, and the growth rate and survival rate of seed clams are lowest in mode 4. In mode 3 and modes 4, the growth rate of seed clams in underlay is lowest, next is that in middle, and next is that in superstratum.
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| Key words: Mercenaria mercenaria, Intermediate culture, Modes |
