By altering their body position and synchronizing movements with the eddies they encounter, says New Scientist, trout save so much energy that they do not have to use their main swimming muscles.
इसका सबसे ज़्यादा प्रकोप अफ्रीका के दक्षिणी सहारा इलाकों में है, जहाँ 2.5 करोड़ एड्‌स के मरीज़ हैं ।