The influence of main ecological and environmental factors on the energy budget of Schlegel''s black rockfish Sebastes schlegeli

In the Maidao Ecological Laboratory of the Huanghai Sea Fisheries Research Institute in 1998 ~ 2000, the continuous flow-through method was adopted to determine the energy budget components and models of Schlegel＇ s black rockfish under different ecological and environmental factors, such as temperature, food species, body mass and feeding level, etc. The body mass of test fish ranged from 21.2 to 224.5 g. The specific growth rate tended to invert ＂U＂ change with temperature increase. The ecological conversion efficiency showed the same trend as temperature and feeding level rise. Only the specific growth rate tended to decelerate the increment with the rise of feeding level. From the above quantitative relationships, the maximum and optimal growth temper- atures could be obtained as 17.5 and 16.2 ℃, and the maintenance feeding rate and optimum feeding rate as 0.8% and 4. 1% of the body mass. The specific growth rate and ecological conversion coefficient showed a decelerating decrease trend with body mass increment. The small-sized fish food was more advantageous to the feeding level increase in comparison with the small-sized shrimp food, which led to the increase of growth, metabolism and excretion, but had no significant influence on the ecological conversion coefficient. All of temperature, feeding level, body mass and food species can obviously change the energy budget models. The assigning rate of growth energy tended to change along the invert ＂U＂ curve with the increase of temperature and feeding level, and decrease with the body mass increase, but the assigning rates of metabolism energy and excretion energy were quite reverse. These relationships could be quantitatively described as quadratic or power function curve. If the above relationships proved true to other marine fish, the establishment of energy budget model of the same fish under different conditions can be largely simplified.     

鱼类精液超低温冷冻保存的研究展望

精液的超低温冷冻保存是从上世纪50年代开始的，此项技术发展至今已取得很大成就。国外学者的工作主要集中在冷水性鲑鳟鱼类及某些海水鱼上，而国内以研究四大家鱼及其他淡水鱼类精液的超低温保存居多，只有少数学者研究如真鲷、黑鲷、花鲈、大弹涂鱼等海水鱼类精液的超低温保存。本文就开展鱼类精液冷冻保存研究的意义、鱼类精子超低温保存的基本生物学原理，及有关鱼类精液冷冻保存的研究现状等作一综合评述。     

南方池养牙鲆全人工配合饲料饲养试验

采用全人工配合饲料(试验组饲料)与湿颗粒饲料 (对照组饲料 )对南方池养牙鲆进行为期 204d的饲养试验.结果表明,试验组与对照组牙鲆的尾相对增重率分别为 2 304%、2 297%,尾平均日增重差异不大,平均饲料系数分别为 1. 56、2. 58,牙鲆增重 1kg所需饲料成本分别为 10. 92元和 13. 55元,试验组比对照组节省饲料成本2. 63元 /kg鱼增重;试验组与对照组牙鲆平均内脏比 (分别为 6. 50%、6. 38% )、平均丰满度(分别为 1. 09、1. 07)、肌肉粗蛋白含量、粗脂肪含量等差异不显著(p>0. 05),10种必需氨基酸和 5种鲜味氨基酸的含量很接近.由此可见,南方池养牙鲆采用全人工配合饲料饲养是完全可行的.