David Anderson is a former legal adviser to the Foreign and Commonwealth Office (1960-1996) and judge of the International Tribunal for the Law of the Sea (1996-2005).
Though less famous and romanticized than Atlantic or Caribbean pirates, corsairs in the Mediterranean equaled or outnumbered the former at any given point in history.  Mediterranean piracy was conducted almost entirely with galleys until the mid-17th century, when they were gradually replaced with highly maneuverable sailing vessels such as xebecs and brigantines . They were, however, of a smaller type than battle galleys, often referred to as galiots or fustas .  Pirate galleys were small, nimble, lightly armed, but often heavily manned in order to overwhelm the often minimal crews of merchant ships. In general, pirate craft were extremely difficult for patrolling craft to actually hunt down and capture. Anne Hilarion de Tourville , a French admiral of the 17th century, believed that the only way to run down raiders from the infamous corsair Moroccan port of Salé was by using a captured pirate vessel of the same type.  Using oared vessels to combat pirates was common, and was even practiced by the major powers in the Caribbean. Purpose-built galleys (or hybrid sailing vessels) were built by the English in Jamaica in 1683  and by the Spanish in the late 16th century.  Specially-built sailing frigates with oar-ports on the lower decks, like the James Galley and Charles Galley , and oar-equipped sloops proved highly useful for pirate hunting, though they were not built in sufficient numbers to check piracy until the 1720s. 
In both high-order and low-order salvage the amount of the salvage award is based first upon the value of the property saved. If nothing is saved, or if additional damage is done, there will be no award. The other factors to be considered are the skills of the salvor, the peril to which the salvaged property was exposed, the value of the property which was risked in effecting the salvage, the amount of time and money expended in the salvage operation etc.