Tài liệu thinking networks the large and small of it potx

Ngày tải lên: 24/02/2014, 04:20

... on a number of criteria (Fig. 1.5.). Most of the criteria as identified from the viewpoint of the larva have already been discussed above with the exception of the criterion ‘purity’. One should ... the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. ABSTRACT The culti...

Ngày tải lên: 15/12/2013, 00:15

... diets either as a supplement or as the main food source. These various aspects of the production, use and substitution of micro-algae in aquaculture will be treated within the limits of this ... drawback of the system is the large diameter of the bags (60 cm) which results in self- shading and hence relatively low algal densities. The disadvantages of the...

Ngày tải lên: 15/12/2013, 00:15

... the intestinal tract of the rotifers are killed as well. The concentration of the disinfection products differs according to their toxicity and the initial condition of the rotifers. Orientating ... facilitates on one hand the possibilities for automatic feeding but on the other hand requires the use of aeration and cold storage. The following standard cult...

Ngày tải lên: 15/12/2013, 00:15

... from these few sources in North America and seemed to be unlimited. However, with the expansion of aquaculture production in the 1970’s, the demand for Artemia cysts soon exceeded the offer and ... unsaturated fatty acids in the brine shrimp metanauplii, the nutritional quality of the Artemia can be further tailored to suit the predators’ requirements. Application...

Ngày tải lên: 15/12/2013, 00:15

... place, the incubation salinity will interfere with the amount of glycerol that needs to be built up to reach the critical osmotic pressure within the outer cuticular membrane of the cysts. The ... for the culture of carp larvae during the first two weeks, the use of decapsulated cysts constitutes a saving of over one third in the amount of Artemia cysts used...

Ngày tải lên: 15/12/2013, 00:15

... much smaller quantities has proven to be more effective and safer for the environment. In this respect the possibility of loading Artemia nauplii with doses of up to 300 µg.g -1 DW of the therapeutic ... variability in fish hatchery production. The latter is particularly important since it was the missing link in the development of commercial production. Furthermo...

Ngày tải lên: 15/12/2013, 00:15

... affecting the filtration rate, ingestion rate and/ or assimilation: including the quality and quantity of the food offered, the developmental stage of the larvae, and the culture conditions. More ... consequence the nutritional composition of the diet does not play the most critical role in the selection of diets suitable for high density culture of brine s...

Ngày tải lên: 15/12/2013, 00:15

... oxygen depletion and mortality of the cultured species. Increased bacterial activity also increases the acidity of the bottom. The use of organic fertilizers increases the risk of infections. ... tolerance ranges and characteristics for use in aquaculture. Therefore, the selection of the strain best adapted to the particular ecological conditions of the sit...

Ngày tải lên: 15/12/2013, 00:15

... aware that the greater the surface area of the net the more effective and rapid the filtration. Hence, the upper limit of the dimensions of the nets depends on the ease of handling rather than ... anything else. The effectiveness of filtering is also influenced by the mesh size of the net: the denser the net the faster it will clog, hence, th...

Ngày tải lên: 15/12/2013, 00:15