杉木球果麦蛾种群动态规律的研究

杉木球果麦蛾是杉木的主要种实害虫，其危害可造成种子品质和产量的严重下降。据４个年份的调查结果表明，杉木球果麦蛾幼虫种群数量变动比较稳定。每样枝平均虫口密度在０．２５─２．５条内变动。因幼虫在球果内栖息和危害受外界气候、天敌等影响小，故存活率较高：根据４年的观察比较，平均存活率８５．８％。可以此作为参数，准确预报翌年的种群消长趋势，为生产上开展综合治理提供科学依据。     

Growth and production of endangered Indian butter catfish,Ompok bimaculatus (Bloch) at different stocking densities in earthen ponds

Growth, survival and production of endangered Indian butter catfish (Ompok bimaculatus) fingerlings were examined at different stocking densities. The experiment was conducted for 8 months in nine earthen ponds having an area of 0.03 ha each. 30‐day‐old fingerling, stocked at 40 000 ha^?1 was designated as treatment‐1 (T1), 50 000 ha^?1 as treatment‐2 (T2) and 60 000 ha^?1 as treatment‐3 (T3). At stocking, all fingerlings were of same age group with a mean length and weight of 3.36 ± 0.08 cm and weight of 0.83 ± 0.02 g respectively. Fish in all the treatments were fed with a mixture of rice bran (50%), mustard oil cake (30%), fish meal (19%) and vitamin‐mineral premix (1%). Physicochemical parameters, plankton populations and soil parameters were at the optimum level for fish culture. Highest weight gain was observed in T1 and lowest in T3. Final length, weight and survival of fish also followed the same trend as weight gain. Highest specific growth rate was observed in T1 followed by T2 and T3. Feed conversion ratio was significantly lower in T1 followed by T2 and T3 in that order. Significantly higher amount of fish was produced in T1 than T2 and T3 respectively. Higher net benefit was obtained from T1 than from T2 and T3. Overall, the highest growth, survival and benefit of fish were obtained at a density of 40 000 fingerlings ha^?1. Hence, of the three stocking densities, 40 000 fingerlings ha^?1 appears to be the most suitable stocking density for culturing of Indian butter catfish in grow‐out system.     

云南板栗二斑象甲研究

云南省板栗二斑栗象（ＣｕｒｃｕｌｉｏｂｉｍａｃｕｌａｔｕｓＦａｕｓｔ）的系统研究。文中报道二斑象甲在云南各地的分布，为害情况，不同地理位置的翅斑变型及主要生物生态学特性。以物候学方法预测预报成虫的发生期。提出秋后翻犁栗林空地，施用球孢白僵菌（Ｂｅａｔｖｅｒｉａｂａｓｓｉａｎａ（Ｂａｌｓａｍｏ）Ｖｎｉｌｅｍｉｎ），保护利用捕食性、寄生性天敌的系统综合防治措施。     

双斑东方鲀网箱养殖试验

本文报道了双斑东方(鱼屯)网箱养殖试验。其结果:在水温13-30℃,盐度23.4-27.3条件下,平均全长4.3cm,平均体重2.8g鱼苗,经11个月试养,平均全长达17.0cm,平均体重达130.4g,成活率为42％。此外,本文还探讨了水温对双斑东方(鱼屯)生长及成活率的影响。     

Is the use of turmeric in the diet safe for fish?

With this study, we aimed to assess the safety of using Curcuma longa in fish feed. Juvenile Astyanax aff. bimaculatus (0.83 ± 0.04 g) were kept in 24 80‐L aquaria, at a density of 0.5 fish L^?1 for 60 days. Six diets supplemented with 0.0, 20.0, 40.0, 60.0, 80.0 and 100.0 g kg^?1 were evaluated. Histopathological analysis of the gills showed that there was an increasing linear effect of turmeric on the frequency of lamellar aneurysm, hypertrophy of mucous cells, oedema and necrosis. There was a quadratic effect of turmeric supplementation on the frequency of fusion and disruption of secondary lamellae, vacuolation and hypertrophy of the epithelial cells, and the estimated values to minimize these variables were 4.63, 25.93 and 24.46 g kg^?1 respectively. There was a quadratic effect of turmeric on the gills index (I_BRA), and the estimated value to minimize this index was 30.23 g kg^?1. No effect of turmeric on the frequency of histopathological changes and organ index in fish liver was observed. Thus, we conclude that turmeric is not hepatotoxic for A. aff. bimaculatus; however, its use is safe at concentrations up to 30.23 g kg^?1 diet as a function of its gill toxic effect at higher doses.     

双斑东方鲀全人工繁殖试验

对野生双斑东方鲀(Takifugu bimaculatus)人工繁殖的子一代进行人工培育,雌鱼须经三年性腺成熟,成熟系数为17.55%,雄鱼性腺成熟为两年。产卵前一个月,雌亲鱼经强化培育、催熟后,成熟系数可达到25.00%。对7组亲鱼注射LRH-A_2激素,共获鱼苗1.2048×10~6尾,其中全人工繁殖鱼苗9.592×10~5尾,对照组获鱼苗2.456×10~5尾。并就双斑东方鲀性成熟年龄等进行讨论。