An integrated recirculating aquaculture system (IRAS) is considered as an alternative solution for efficient utilization of available resources, nutrient recycling and maintaining ecological balance. The effects of using magnetized water on the growth performance of common carp (Cyprinus carpio L.) and water quality parameters were investigated in an IRAS.Six independent IRASs were designed; each system consisted of three tanks: a fish rearing tank, a waste-collection tank and a biological filter tank. An additional crop of macrophyte (Lemna minor) was used as a medium in the biological filter tanks in order to qualify as an IRAS. Two treatments with three replicates were set up in a randomized design. The experimental treatment was supplied with the magnetic field device, while there was no device in the control treatment.The fish growth, feeding efficiency and water quality parameters were measured in all systems. The results revealed that the use of magnetized water in the IRASs increased the specific growth rate of common carp and the growth rate of plants; while, decreased the feed conversion ratio. However, the magnetized water had no effects on the concentrations of ammonium nitrogen, nitrite nitrogen and nitrate nitrogen. The study suggested that the use of magnetized water in the IRASs could be beneficial as a cost-effective technique to increase the profitability of the system.

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In this study, we cloned and sequenced the complete mitochondrial genome of Perca fluviatilis. It was a circular double-stranded DNA molecule of 16,537 base pairs (bp) in length and consists of 13 protein-coding genes, 22 tRNA genes, two ribosomal RNA genes and two main non-coding regions (the control region and the origin of the light strand replication). The mitogenome of shared common features with those of other toleosts in terms of gene order and base composition. All protein-coding genes were initiated with ATG except for COX 1, which began with GTG instead. However, the termination codons of 13 protein-coding genes are varied with TAG, TAA or T. This mitogenome sequence data would contribute to better understanding phylogenetic relationships and population genetics of the family Percidae.