Osprey are the only raptor that plunges into the water to catch its prey. The fact that they can then take off, let alone with a large struggling fish is impressive. Some of us can't always hold a fish long enough to take out the hook! Osprey have special adaptations which allow this unique fishing style.
"The Osprey is particularly well adapted to this diet, with reversible outer toes, sharp spicules on the underside of the toes, closable nostrils to keep out water during dives, and backwards-facing scales on the talons which act as barbs to help hold its catch." (Wikipedia)Last fall, Mike Kromrey pointed out an Osprey flying over Valley Water Mill. Never common breeders in Missouri, their numbers were apparently reduced even before DDT took a toll on their population. Like other species at the top of their respective food chain, they are vulnerable to toxins accumulated in fish. We are seeing more Osprey in recent decades due to the reduction of pesticides and the development of reservoirs. (MDC)
More general information on Osprey can be found at this natural history site.