This is the beautifully designed KS1620TROUT knife from Kershaw knives. Called the Scallion, by Ken Onion, its a beautiful design with a 2.25 inch 420HC grade stainless steel blade which curves inwards, giving increased cutting ability when cutting towards you, such as when skinning, gutting, slicing etc.
The Speed safe assisted blade folds inside the locking liner via the thumb studs you can use to manipulate the blade. When closed it is just 3.5 inches in length, and weighs just 2.3 oz