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Seasonal stratification in fish culture and irrigation reservoirs: potential dangers for fish culture
Authors:A Milstein  M Zoran  H J Krambeck
Institution:(1) Fish and Aquaculture Research Station, 308290 Dor, M.P. Hof HaCarmel, Israel;(2) Max Planck Institute of Limnology, P.O. Box 165, D-2320 Ploen, Holstein, Germany
Abstract:Dual-purpose reservoirs for field irrigation and fish culture are characterized by the simultaneous (a) increase in standing crop biomass and feeds during the fish culture period and (b) decrease of water level due to irrigation. This management practice affects stratification, which in turn affects water quality and may affect the fish stocked. To study the limnology of dual-purpose reservoirs, an extensive sampling programme including automatic continuous recording and manual water sampling in deep and shallow reservoirs was carried out. This paper describes limnological changes during the week in which a 3 month long seasonal stratification ended and fish kills occurred. Management implications of stratification are also discussed. The data presented are the first continuous records of this process in this particular type of water body.
Keywords:Fish culture and irrigation reservoir  Stratification
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