Abstract
Results obtained from a step by step approach to the biomanipulation of a natural lacustrine environment (Lago di Candia, Northern Italy) are presented. Since the diversion of the municipal sewage of the small town of Candia, runoff and precipitation have been the sole contributors of nutrient to the lake. Fish population is mainly characterized by rudd (Scardinius erythrophthalmus) overstocking and by a low density of large-mouth-bass (Micropterus salmoides) and pike (Esox lucius). During 1986 about 12 t of rudd (1–2 year old) were removed from the lake. Considering 1986 as ‘control year’, average Secchi disc transparency improved from 2.3 m in 1986 to 3.3 m in 1988; phytoplankton biovolume decreased from 114 to 58 mm3 1−1 but zooplankton biovolume increased from 8 to 11.5 mm3 1−1. The results achieved show that a grodual biomanipulation treatment can have a satisfactory outcome, and has the advantage of not producing catastrophic situations either in the biotic or in the abiotic compartments of the lake.
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Giussani, G., de Bernardi, R., Ruffoni, T. (1990). Three years of experience in biomanipulating a small eutrophic lake: Lago di Candia (Northern Italy). In: Gulati, R.D., Lammens, E.H.R.R., Meijer, ML., van Donk, E. (eds) Biomanipulation Tool for Water Management. Developments in Hydrobiology, vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0924-8_30
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DOI: https://doi.org/10.1007/978-94-017-0924-8_30
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