Sap activity, which transforms excess ingested sugar into long-chain oligosaccharides." A much larger set of animals do however consume phloem sap by proxy, either "through feeding on the honeydew of phloem-feeding hemipterans. Honeydew is physiologically less extreme than phloem sap, with a higher essential:non-essential amino acid ratio and lower osmotic pressure," or by feeding on the biomass of insects that have grown on more direct ingestion of phloem sap. Maple syrup is made from reduced sugar maple xylem sap. The sap often is harvested from the Sugar Maple, "Acer saccharum". In some countries (e.g., Lithuania, Latvia, Estonia, Finland, Belarus, Russia) harvesting
Tonlé Sap the Khmer Rouge took over from 1975 to 1979. We had to flee to Vietnam, [but] afterwards we came back and have been fishing on the Tonlé Sap ever since." Thousands of peasants follow this lifestyle. Catching Tonle Sap fish is simple. Later, the real work begins. Because of the drop in the water level, the Tonlé Sap naturally carries away thousands of fish. Fishers place cone-shaped nets into the water from their floating houses and then lift the net as soon as seconds later. Using this technique, two or three tons of fish are trapped each time and more