The impact of level of the stocking density on the haematological parameters of rainbow trout (Oncorhynchus mykiss) reared in recirculating aquaculture system
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 4
Abstract
Hematological indices are important parameters for the evaluation of fish physiological status. The purpose of this experiment was to evaluate how level of the stocking density influence the blood physiology of of juvenile rainbow trout (Oncorhynchus mykiss) reared in a recirculating system. The experiment was conducted over a period of 33 days. A number of 254 rainbow trout with an average weight of 29.51 ± 1.32 g were divided into four rearing units in order to create different stocking densities: in B1-2.64 kg/m[sup]3[/sup], with an average weight of 31.68 g/ex, B2 – 5.16 kg/m[sup]3[/sup]with an average weight of 30.39 g/ex, B3 – 7.12 kg/m[sup]3 [/sup]with an average weight of 28.52 g/ex and B4- 9.42 kg/m[sup]3 [/sup]with an average weight of 27.46 g. The sampling of O. mykiss blood from the four variants before and after the experimental trial allowed determination of hematological indices. Red blood cell counts (RBCc), haematocrit values (Ht), haemoglobin concentration (Hb), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) were measured and analyzed, with routine methods used in fish hematology (Blaxhall & Daisley 1973;Svobodova 2001). Some hematological indicators (Hb, MCV, MCH) had been influenced by the stocking density. The results of our research provide a contribution to the knowledge of the hematological parameters of the rainbow trout reared in different level of stocking densities, under the recirculating systems condition.
Authors and Affiliations
Angelica Docan, Victor Cristea, Lorena Dediu, Mirela Mocanu (Creţu), Iulia Grecu
Keywords
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