采用传统的细菌培养方法,对大菱鲆(Scophthalmus maximus)育苗生产过程中不同发育时期仔稚鱼的消化道、投喂饵料和养殖水源中的可培养细菌进行了菌群结构分析和优势菌株的16S r DNA同源性比较,揭示其形成过程和演替规律。结果显示,在大...采用传统的细菌培养方法,对大菱鲆(Scophthalmus maximus)育苗生产过程中不同发育时期仔稚鱼的消化道、投喂饵料和养殖水源中的可培养细菌进行了菌群结构分析和优势菌株的16S r DNA同源性比较,揭示其形成过程和演替规律。结果显示,在大菱鲆仔稚鱼5-36日龄的不同发育时期,消化道中的细菌数量呈现了先升高后降低的变化趋势,在17-26日龄期间,仔稚鱼消化道可培养细菌数量级在105-106 CFU/g以上,并且与其他时期存在极显著差异(P<0.01)。弧菌总量呈现先升高后稳定的变化趋势,17日龄之前与之后存在显著差异(P<0.05)。至投喂颗粒饵料期,细菌总量和弧菌总量均稳定在104 CFU/g数量级,弧菌成为大菱鲆仔稚鱼消化道中的优势菌种。本研究发现,大菱鲆仔稚鱼发育早期消化道中的优势菌群变化明显,并且生物饵料中的细菌对消化道中的菌群结构影响较大,其中的Vibrio ichthyoenteri最终成为仔稚鱼消化道中的优势菌种。展开更多
This paper deals with breeding and propagation techniques for Matepenaeus ensis. Some issues of spawning, hatchery techniques, larval rearing etc. are discussed. The methods to control the important ecological factors...This paper deals with breeding and propagation techniques for Matepenaeus ensis. Some issues of spawning, hatchery techniques, larval rearing etc. are discussed. The methods to control the important ecological factors such as water temperature, and salinity are introduced. The results show larvae of Matepenaeus ensis can be reared under different combination of temperature (28 30 ℃)and salinity (24 35).展开更多
The present study describes the habitats, life cycle, larvae growth, burrowing behavior and terrestrial adaptation of Spadefoot toads in Israel based on observations and data collected during more than 30 years in nor...The present study describes the habitats, life cycle, larvae growth, burrowing behavior and terrestrial adaptation of Spadefoot toads in Israel based on observations and data collected during more than 30 years in northern Israel. The distribution area in Israel is from the north in the Upper Galilee and Golan Heights (annual rainfall range of 500 - 1000 mm) to the southern coastal plain (annual rainfall of about 250 mm). Among the 51 different breeding places of amphibians, only ponds where water was available for a few months were used by Spadefoot toads and metamorphosed populations were found around these ponds. The larvae underwent metamorphosis during the summer and autumn in northern Israel, and during the spring in central and southern Israel. A negative correlation exists between the percentage of toads burrowing and soil moisture levels, with greater burrowing behavior occurring under dry conditions. The plasma concentration increased during burrowing by electrolytes and urea accumulations. The burrowing behavior helped Spadefoot toads survive in this area at the southern border of its distribution.展开更多
[Objective] The aim was to explore key technology to cultivate Holotdchia diomphalia larvae with Agaricus bisporus residues and to provide, technologicar sup- ports for processing of Agaricus bisporus residues. [Metho...[Objective] The aim was to explore key technology to cultivate Holotdchia diomphalia larvae with Agaricus bisporus residues and to provide, technologicar sup- ports for processing of Agaricus bisporus residues. [Method] In the research, fodder thickness, population density and residues under different treatments were set to re- search effects on Holotrichia diomphalia larvae. [Result] The optimal thickness of fodder was 25 cm and the optimal feeding density was 44-56 larvae per hectare. The dry residues were more suitable, compared with decomposed residues and corn bran powders, for cultivation of Holotrichia diomphalia larvae. [Conclusion] Cultivation of Holotrichia diomphalia larvae with Agaricus bisporus residues is a new method to make use of Agaricus bisporus residues and of significance for extension of agricul- tural circulation chain, increase of economic benefits and ecological benefits.展开更多
文摘This paper deals with breeding and propagation techniques for Matepenaeus ensis. Some issues of spawning, hatchery techniques, larval rearing etc. are discussed. The methods to control the important ecological factors such as water temperature, and salinity are introduced. The results show larvae of Matepenaeus ensis can be reared under different combination of temperature (28 30 ℃)and salinity (24 35).
文摘The present study describes the habitats, life cycle, larvae growth, burrowing behavior and terrestrial adaptation of Spadefoot toads in Israel based on observations and data collected during more than 30 years in northern Israel. The distribution area in Israel is from the north in the Upper Galilee and Golan Heights (annual rainfall range of 500 - 1000 mm) to the southern coastal plain (annual rainfall of about 250 mm). Among the 51 different breeding places of amphibians, only ponds where water was available for a few months were used by Spadefoot toads and metamorphosed populations were found around these ponds. The larvae underwent metamorphosis during the summer and autumn in northern Israel, and during the spring in central and southern Israel. A negative correlation exists between the percentage of toads burrowing and soil moisture levels, with greater burrowing behavior occurring under dry conditions. The plasma concentration increased during burrowing by electrolytes and urea accumulations. The burrowing behavior helped Spadefoot toads survive in this area at the southern border of its distribution.
基金Supported by the National Key Technology R&D Program (2007BAD89B09-10)National Public Service Project (200803033-A0903)~~
文摘[Objective] The aim was to explore key technology to cultivate Holotdchia diomphalia larvae with Agaricus bisporus residues and to provide, technologicar sup- ports for processing of Agaricus bisporus residues. [Method] In the research, fodder thickness, population density and residues under different treatments were set to re- search effects on Holotrichia diomphalia larvae. [Result] The optimal thickness of fodder was 25 cm and the optimal feeding density was 44-56 larvae per hectare. The dry residues were more suitable, compared with decomposed residues and corn bran powders, for cultivation of Holotrichia diomphalia larvae. [Conclusion] Cultivation of Holotrichia diomphalia larvae with Agaricus bisporus residues is a new method to make use of Agaricus bisporus residues and of significance for extension of agricul- tural circulation chain, increase of economic benefits and ecological benefits.
