Author/Authors :
محمدي زاده م نويسنده Aquaculture Department, Faculty of Agriculture and Natural Resource, Islamic Azad University, Science and Research Branch of Tehran, Tehran, Iran Mohamadizadeh Kh M , شمسايي م نويسنده Aquaculture Department, Faculty of Agriculture and Natural Resource, Islamic Azad University, Science and Research Branch of Tehran, Tehran, Iran Shamsaie M m , عبداله تبار ي نويسنده Aquaculture Department, Faculty of Agriculture and Natural Resource, Islamic Azad University, Science and Research Branch of Tehran, Tehran, Iran Abdollahtabar Y , سلطاني الف نويسنده Department of Irrigation and Reclamation engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Iran Soltani A
Abstract :
The effects of water current increment on rainbow
trout (Oncorhynchus mykiss) culture were investigated
during a 35 day experiment. Fish weighing
5.5 g were stocked in aquarium tanks. Four different
water speeds (0, 3.5, 7, 10.5 cm/s) were provided for
each treatment in three replicates. These different
currents water were provided by reusing outlet water
of each culture unit. Length, weight, daily growth
rate (DGR), specific growth rate (SGR), condition
factor (CF) and survival rate (SR) were evaluated
in each treatment. Also, the changes of NO2, NO3,
NH3, NH4+, total hardness and pH were measured.
The data variance analysis showed significant differences
among all treatments during the first week
(P < 0.01). However, these results were not observed
in following days. Based on Duncan’s test results,
the best survival rate (97%), daily growth rate (1),
SGR (6%) and average weight (24g) were achieved
in 10.5 cm/s.
