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采用玻璃钢水槽来培育河蟹溞状幼体的试验,我所于1981年采用九只一顿的玻璃钢水槽进行了人工育苗试验,获得蟹苗3000多只。今年对玻璃钢水槽的进水系统、排水管、充气方式、水的处理、投喂方法、饵料的种类、日常管理都作了一些改进,继续进行了试验。从5月4日开始至7月初结束,先后搞了二次试验,第一次试验因温度较低(14℃—18℃),最高成活率只有1.4％,单位水体出苗量只有3384只,平均成活率为0.16％。第二次试验,由于温度处于适宜的范围(19～22℃),因而成活率和单位水体出苗量均高于第一次,最高成活率为7.6％,单位水体出苗量为15146只,平均
The use of fiberglass water tank to nursery crab-like larvae of the test, I used in 1981 by a single glass fiberglass sink artificial seedling test, to obtain more than 3,000 crabs. This year on the FRP sink inflow system, drainage, inflatable, water treatment, feeding method, the type of bait, daily management have made some improvements, continue the experiment. From the beginning of May 4 to the end of July, two tests have been carried out successively. The first experiment, due to the lower temperature (14 ℃ -18 ℃), had the highest survival rate of only 1.4% and only 3384 water bodies per unit The survival rate was 0.16%. In the second experiment, the survival rate and unit seedling emergence rate were both higher than the first one due to the temperature in the suitable range (19-22 ℃), the highest survival rate was 7.6% and the unit seedling emergence rate was 15146 with the average