排序方式: 共有5条查询结果,搜索用时 265 毫秒
1
1.
2.
Jochanan Aronowicz 《Marine Biology》2007,151(3):1137-1141
The “agitator”, a device designed for culturing lecithotrophic echinoderm larvae, is described. The unit consists of an open
system which is easily constructed and is made up of a base which holds the culturing baskets as well as a lid or manifold
carrying a tube which transports fresh seawater into each culture, gently stirring it and eliminating any decaying embryos.
The device is scalable and water flow can be adjusted for laminar flow or slow dripping. The method has been used to successfully
rear large numbers of lecithotrophic larvae of the starfish Solaster stimpsoni. The agitator could be used to culture any fragile planktonic organisms that require an extended rearing time. 相似文献
3.
Arash Massoudieh Erik LoboschefskyTed Sommer Timothy GinnKenneth Rose Frank Loge 《Ecological modelling》2011,222(19):3513-3523
Most models developed for the movement and fate of eggs and larvae of aquatic species are based on a particle tracking approach. Although this method has many advantages due to its high flexibility, particle tracking may become computationally intensive for complex geometries and when large numbers of particles are needed to simulate the population properly. In continuous models based on advection and dispersion mechanisms, the computational burden is independent of the size of the population. We developed a continuous fate and transport model for striped bass eggs and larvae in the San Francisco Bay-Delta. The model predicts the concentration of eggs and larvae at any location over time. The method of moments was used to account for the effect of temperature and age on the transition of eggs to larvae and larvae to juveniles. Egg and larval mortality were represented as functions of temperature, and eggs also experienced settling mortality. The fate and transport model used the same one-dimensional spatial grid as the existing Delta Simulation Model II (DSM2) hydrodynamics model. DSM2 output of flow rates, water depths, and cross-sectional areas were inputted into the fate and transport model to determine transport. The model was applied to striped bass eggs and larvae data collected during years 1990-1994; agreement between the modeled and the measured data was acceptable in most cases. Exploratory simulations were performed to demonstrate how the model could be used to evaluate the effects on egg and larval survival and total juvenile production of water diversions for supply and agricultural use and changes in the long-term mean water temperature. The model can be further used to examine the impact of various operation strategies in the San Francisco Bay-Delta, where diversion losses of early life stages of fishes remain a major management issue. 相似文献
4.
We characterized fluorescent silica nanoparticles (FNPs), which had been applied in many biological systems, in fish embryo rearing media (ERM) solution and evaluated the potential toxicity to the early development of Oryzias latipes embryos. Distribution of FNPs in embryos and larvae of O. latipes was studied by fluorescent and confocal laser scanning microscopic studies. Embryos exposed to three different concentrations of FNPs in stirred or sonicated ERM solutions were observed up to 2 d after hatching. FNPs had a negligible effect on the hatchability of O. latipes embryos; however, compared to controls, more than 30% of eggs were abnormal in 10 and 50 mg FNP L−1 solutions. We found that the toxic effect was increased in sonicated FNP solution, which seems to be related with the dissolution of FNPs in ERM solutions that could be accelerated by sonication. Further study found that the CaCl2 included in ERM solution might enhance the dissolution of the FNPs and the silicate ion released from FNPs partially contributed to larval toxicity. This study showed that some nanoparticles may not be stable in biological fluids even if they are stable in water. Dissolution factors such as sonication and cellular components should be considered in biological application of nanoparticles. 相似文献
5.
摇蚊幼虫的水生态毒理学研究进展 总被引:9,自引:0,他引:9
本文综述了国外对摇蚊幼虫的水生态毒理学研究的最新进展,包括生物检测、生物积累和遗传毒理研究等几方面.国外的研究表明摇蚊幼虫可以作为常用试验生物(鱼类和蚤类)的补充,用于有毒化学品的急、慢性毒性生物检测和遗传毒性研究,以及生物积累试验,以评价化学品的生态效应,并对污染物进行生物监测. 相似文献
1