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By Claude Boyd, Aaron McNevin

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The ability of governments to collect such data accurately and share the information with those wanting to study local, regional, continental, or global demographics has traditionally been quite limited. In fact many of the statistics such as birth and death rates were not defined until the nineteenth century. Thus, population statistics have improved in reliability over time, and of course, much more is known about the history of human population in some regions or countries than in others. The most reliable demographic data are from about 1850 to present, and certainly the reliability of these data is much better since the early 1950s when international organizations such as the United Nations (UN) began to work with member countries to obtain population data at frequent intervals and to maintain these data in accessible archives.

Because of high feed input, the phytoplankton bloom diminishes and is replaced by a bacterial suspension or floc. Feed input usually consists of regular aquaculture feed plus crushed grain, molasses, or other source of organic matter. Bacteria decompose the organic carbon source using ammonia from metabolic wastes of the culture species. The bacteria floc is rich in protein and serves as food for the culture species. Thus by combining feed and organic matter and using nitrogenous wastes from the feed to stimulate production of microbial protein, the crude protein input for production of the aquaculture species can be lessened considerably in comparison with normal feed-based aquaculture.

In the second millennium AD, the population increased at a greater rate, and a global population of 1 billion was attained soon after 1800. It had taken mankind tens of thousands of years to attain a population of 1 billion. Beginning about 1800, the growth of the global population exploded; it doubled again by the late 1920s—a period of around 120 years to gain the second billion. After the 1920s, the time necessary to add 1 billion people continued to decline: 3 billion by 1959 (32 years); 4 billion by 1974 (15 years); 5 billion by 1987 (13 years); 6 billion by 1999 (12 years).

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