Evaluation of a rainbow trout (Oncorhynchus mikyss) culture water recirculating system
Journal Title: Revista MVZ Cordoba - Year 2014, Vol 19, Issue 3
Abstract
Objective. To evaluate a water recirculation system for rainbow trout fish cultures at the recirculating laboratory of the Aquaculture Engineering Production Program of University of Nariño. Materials and Methods. 324 rainbow trout (Oncorhynchus mikyss) fries were cultured in 12 plastic tanks with a capacity of 250 L in an aquaculture recirculating system the treatment system of which was made up by a conventional sedimentation tank, a fixed stand upflow biofilter with recycled PVC tube pieces and a natural degassing system; the sedimentation unit effluent was pumped up to a reservoir tank using a 2 HP centrifugal pump after being subject to gravity through the biofilter and to be then distributed to the 12 culture units to which a constant amount of air from a blower was injected. Results. The water treatment system removed 31% of total suspended solids, 9.5% of total ammonia nitrogen, and increased dissolved oxygen to the final effluent in 6.5%. An increase of 305% in biomass was calculated during 75 days, the mortality percentage registered throughout the study period was 4.9%. Conclusions. The water treatment system maintained the physicochemical water quality parameters within the values recommended for the species. The increase in weight and size, food conversion, mortality and biomass production reported normal values for rainbow trout fish culture in recirculating systems.
Authors and Affiliations
Iván Sánchez O, M. Sc *| Universidad de Nariño, Faculty of Livestock Sciences, Department of Hydrobiological Resources, Aquaculture Production Engineering Program. Ciudad Universitaria, Barrio Torobajo Carrera 22#18-109. San Juan de Pasto, Nariño, Colombia.Correspondence: iaso@udenar.edu.co., Wilmer Sanguino O, IPA| Universidad de Nariño, Faculty of Livestock Sciences, Department of Hydrobiological Resources, Aquaculture Production Engineering Program. Ciudad Universitaria, Barrio Torobajo Carrera 22#18-109. San Juan de Pasto, Nariño, Colombia., Ariel Gómez C, Esp| Universidad de Nariño, Faculty of Livestock Sciences, Department of Hydrobiological Resources, Aquaculture Production Engineering Program. Ciudad Universitaria, Barrio Torobajo Carrera 22#18-109. San Juan de Pasto, Nariño, Colombia., Roberto García C, IPA| Universidad de Nariño, Faculty of Livestock Sciences, Department of Hydrobiological Resources, Aquaculture Production Engineering Program. Ciudad Universitaria, Barrio Torobajo Carrera 22#18-109. San Juan de Pasto, Nariño, Colombia.
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