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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 1 pptx
... Organization of the United Nations Rome, 1996 The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the ... Applications for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to the Director, Information Division, Food and Agriculture Organization of the ... based 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...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 2 doc
... inoculation hood (right). A common source of contamination is the condensation in the airlines which harbor ciliates. For this reason, airlines should be kept dry and both the air and the carbon ... vary considerably according to the culture conditions. For example the effect of the composition of the culture medium on the proximate composition of various species of micro-algae is demonstrated ... corresponds with the volume of the preceding stage in the upscaling process, amounts to 2-10% of the final culture volume. An inoculation schedule for the continuous production according to the...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 3 ppt
... 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 concentrations ... the overhead tank only contains water the flow rate can be adjusted without danger of clogging. The dimensions of the tank should be made as such that the complete content of the food tank is ... common method of rotifer production in marine fish hatcheries. The culture strategy consists of either the maintenance of a constant culture volume with an increasing rotifer density or the...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 4 pptx
... However, with the expansion of aquaculture production in the 1970’s, the demand for Artemia cysts soon exceeded the offer and prices rose exponentially, turning Artemia into a bottleneck for the ... parthenogenetic Artemia. Age at first reproduction is a key factor determining the population growth rate, and the rate of colonisation of new environments with limited nutrient resources. Consequently, ... solution of 3 g in 100 ml deionised water· heat the starch solution until it becomes clear · dissolve in the mean time the KI · stock the two labelled bottles in the refrigerator · to check the...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 5 docx
... solution. During overnight dehydration (with aeration to maintain a homogeneous suspension) cysts usually release over 80% of their cellular water, and upon interruption of the aeration, the ... below expectation, the dose should be modified (raised or lowered) by altering the concentration and/or the incubation time; solutions in the range 1 to 10% and incubation times in the range 1 ... Data on the hatching rate allow the calculation of the optimal incubation period so as to harvest nauplii containing the highest energy content (Fig. 4.3.4.). It is important that the T90...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 6 docx
... composition of Artemia nauplii, even if they are enriched by the same person or by various persons (Table 4.3.4.). For example, there was no reduction in variability when only one person handled the ... boosting with DHA during the early larval stages has to be considered with extreme care since the requirements of the larvae may not only depend upon their ontogenetic stage but also on their ... positive effect on the growth of catfish larvae one week after first-feeding; the evaluation of the physiological condition of the larvae showing significantly higher resistance with increasing...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 7 pptx
... 4.5. Pond production 4.5.1. Description of the different Artemia habitats 4.5.2. Site selection 4.5.3. Pond adaptation 4.5.4. Pond preparation 4.5.5. Artemia inoculation 4.5.6. Monitoring ... 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 detailed information concerning ... easily be achieved by strongly aerating the feed suspension with airstones for 1-2 h and then allowing the feed particles to settle by cutting off the aeration for another half an hour. Dissolved...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 8 pptx
... is concentrated in one pond. All other ponds are re-filled with sea water, which once again is evaporated and concentrated in a second pond. This process is repeated until a series of ponds ... 4.5. Pond production 4.5.1. Description of the different Artemia habitats 4.5.2. Site selection 4.5.3. Pond adaptation 4.5.4. Pond preparation 4.5.5. Artemia inoculation 4.5.6. Monitoring ... as the water flow into the ponds is much higher than the outflow (usually ponds are only drained at the end of the culture season). Making use of gravity or tidal currents to fill the ponds,...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 9 pptx
... transport the harvested zooplankton in 50 l containers. Under these conditions the survival of the zooplankton depends on the amount of oxygen dissolved in the remaining water. At a concentration ... considerably with the survival of these fragile organisms. If it is impossible to convey the material continuously along distribution pipes to the place of consumption, the normal practise is to concentrate ... 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...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 10 pptx
... extinguished population after unfavourable seasonal conditions. 6.1.2. Nutritional value of Daphnia The nutritional value of Daphnia depends strongly on the chemical composition of their food source. ... from the incubation suspension by pouring the content of the incubation tank on a submerged 35 µm sieve. After washing with pure preheated seawater the trochophora larvae can be fed to the fish ... material, the content of the container is brought onto a sieve, which is provided with a continuous circular water flow. The unfed particles, exuviae and faeces will collect in the centre on the...
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