In Austria, pearl fisheries are most important in the province of Bohemia, where they are prosecuted in the headwaters of the Moldau from Krumau, a few miles above Budweis, to below Turenberg, and to a much less extent in its tributary, the Wottawa, on the northeastern slopes of the Böhmer Wald or Bohemian Forest mountains. From very early times the right of fishery belonged to those domains and estates through which the streams flow, as for example, the cloister of Hohenfurth, the domain of Rosenberg, of Krumau, etc. The Schwarzenberg family formerly drew a considerable revenue therefrom. Over a hundred years ago the fishery was actively prosecuted by Count Adolph Schwarzenberg, who exhibited at the Bohemian Exposition, held in Prague in 1791, an interesting collection of shells, apparatus employed in the fishery, and many beautiful pearls obtained from his domains. The fisheries of the Wottawa were noted in 1560 by the Swiss naturalist Konrad von Gesner,[221] and again in 1582 by the district treasurer, Wolf Huber von Purgstall. In 1679, Balbinus referred to the excellent qualities of the pearls, estimating the value of many of them at twenty, thirty, and even one hundred golden florins each. He described the methods by which they were taken, and also complained of the destruction of the reefs by depredations of poachers.[222] The Wottawa or Otawa River has long had linked with its name the epithet “the gold- and pearl-bearing brook.” Formerly, along its shores gold washing was more or less carried on, as well as the fresh-water pearl-mussel industry. At the present time, every third or fourth year, these mussels are gathered, by means of small, fine-woven nets, from the bed of the river, and a goodly number of pearls are collected. The reefs in the Moldau from Hohenfurth to Krumau were almost entirely ruined in 1620 by the troops who were cantoned there when the Bohemian Protestants were overthrown near the beginning of the Thirty Years’ War, and they never regained the reputation they formerly enjoyed. According to the Vienna “Handels- und Börsenzeitung,” the output of the pearls fifty years ago in the upper Moldau, in the Wottawa, and in the Chrudimka—a tributary of the Elbe—reached in some years the sum of one million florins in value, and as much as eighty and sometimes even one hundred and twenty florins were paid for an individual specimen.[223] These pearls closely resemble those from Passau in Bavaria, and some approach the oriental gems in luster.