Influence of salinity and dietary composition on blood parameter values of hybrid red tilapia, Oreochromis niloticus (Linnaeus) ×O. mossambicus (Peters) |
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| Authors: | M C J Verdegem A D Hilbrands J H Boon |
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| Institution: | Department of Fish Culture and Fisheries, Wageningen Agricultural University, Wageningen, the Netherlands |
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| Abstract: | The influence of salinity and dietary composition on blood parameter values (haematocrit, leucocrit, immature lymphocytes, mature lymphocytes, granulocytes, plasma osmolarity and total plasma protein) of red hybrid tilapia, Oreochromis niloticus (Linnaeus) x O. mossambicus (Peters), was studied. Two groups of tilapia were fed a high-protein diet while kept in fresh or brackish water, respectively, and compared with two groups fed a low-protein diet under similar environmental conditions. Treatments were executed in duplo. Results show that salinity influenced all cellular blood parameters except the haematocrit. Dietary composition influenced the total plasma protein and haematocrit, while all parameters changed as time progressed during the experiment. It was concluded that the environmental parameters investigated in the present study should be considered when estimating fish health based on blood parameter values. |
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