Download e-book for kindle: Aquaculture Engineering by Odd-Ivar Lekang

By Odd-Ivar Lekang

ISBN-10: 0470995939

ISBN-13: 9780470995938

ISBN-10: 1405126108

ISBN-13: 9781405126106

Around the globe, aquaculture has elevated at a standard of 9.2% for the previous 30 years, in comparison with purely 2.8% annual elevate for terrestrial farming. creation from fish (and shellfish and algae) farms now includes 30% of the complete of the World's nutrition from our waters and this progress is anticipated to proceed until eventually at the very least 2025.Aquaculture engineering is a key zone for all aquatic construction amenities and this complete ebook covers all facets of aquaculture engineering with chapters protecting water shipping and teatment, construction devices (e.g. tanks and cages), feeding platforms, fish shipping and grading, egg dealing with, instrumentation and tracking, slaughtering, cleansing and waste dealing with, development and layout, making plans and quality controls.

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The effluent discharged from a fish farm can contain three classes of pollutant (Fig. 1 Every fish farm, whether it is on land or in the sea, will discharge effluent. 2 Local anaerobic decomposition may occur in the recipient water body if the point discharge is excessive. The nutrient content in the feed must be optimal for the fish, and as much as possible must be available to and taken up by the fish. The amount of feed supplied must be optimal in relation to appetite, so that feed loss is avoided.

11 m). 030. 47 m V = average water velocity d = internal pipe diameter n = kinematic viscosity. Kinematic viscosity is the absolute viscosity divided by the density of the liquid; the unit is m2/s (formerly the stoke was used: 1 St = 16−4 m2/s). The kinematic viscosity tells us something about how easily the liquid flows: for instance, oil will flow out slowly when drops are allowed to fall onto a horizontal plate, while water will be distributed much faster. 05 m2/s at 20°C. 1238 m). 9 Principle of the Moody diagram showing the relation between relative roughness and Reynolds number.

2 mg/l. The water ought to be fully saturated or supersaturated with oxygen gas. It is very important that the oxygen content of the rearing water is high enough: for instance, 7 mg/l (70% saturation) is the typical value for the outlet water in salmonid farming, 30% having been consumed by the fish. Of the other gases dissolved in the water, the concentrations of nitrogen (N2) and carbon dioxide (CO2) must not be too high. 5% saturation. For carbon dioxide, levels are not only dependent upon the inlet concentration, they also increase in the tank as a result of fish metabolism which releases CO2 into the water; the outlet concentration must not therefore be too high.

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Aquaculture Engineering by Odd-Ivar Lekang


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