填空题 There is an increasing need for more food worldwide. According to the projections by the United Nations Population Division, the world population will increase from 6.8 billion today to 9 billion 1 . Sixty-five to ninety percent of the inland capture fish production 2 in the developing and low-income food-deficit countries. 3 for 2020 suggests that 826 million people, or 12. 8 percent, of developing country citizens 4 US $1.25 a day or less and that there will be almost 2 billion poor people living at or below the US $2 a day 5 . The growing population will need significant increase in food production 6 .
More land, including wetlands will be used, and some will be used 7 , as agricultural food production expands during decades. This will 8 increased use of agrochemicals with serious negative consequences for inland fisheries.
9 for both irrigation and domestic purposes will continue to increase, leading to 10 of water for fisheries, especially during the dry season. There will be attempts to 11 water between separate basins, with unpredictable consequences for biodiversity. There are also already plans 12 and transform them into shipping lanes 13 , provinces and countries in areas with poorly developed rail and road infrastructure. There is expected to be increased demand for energy, including hydropower— 14 further damming of rivers.
The need for animal protein, including fish, 15 . Most marine fish stocks are already exploited. 16 increases in aquaculture production, 17 will increase on inland fish stocks, and there will probably be a rise in unsustainable fishing methods, such as the use of 18 , electrofishing and dry pumping of 19 . These methods are all capable of killing 20 indiscriminately.