The effects of dietary lysozyme on growth performance and haematological indices of rainbow trout (Oncorhynchus mykiss) fingerling

Meysam Shakoori; Seyed Hossein Hoseinifar; Hamed Paknejad; Valiollah Jafari; Roghieh Safari

doi:10.22034/ijab.v6i1.432

Authors

Meysam Shakoori Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
Seyed Hossein Hoseinifar
[email protected]
Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. http://orcid.org/0000-0002-0210-9013
Hamed Paknejad Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
Valiollah Jafari Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
Roghieh Safari Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

Vol. 6 No. 1 (2018): February

Articles

February 25, 2018

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The present study investigates the effects of dietary lysozyme on growth performance and haematological indices of rainbow trout (Oncorhynchus mykiss) fingerlings. One hundred and twenty Juvenile rainbow trout fish (initial average weight 5.46±0.05 g) were fed on varying levels of dietary lysozyme (0, 0.5, 1 and 1.5 g kg^-1) for 8 weeks. Thereafter, growth performance as well as haematological indices including WBC, RBC and Hct were measured. Evaluation of growth performance showed no significant increase in fishes fed on different levels of dietary lysozyme (P>0.05). Also, feeding on dietary lysozyme significantly increased WBC compared control (P<0.05); the highest level was detected in 1.5 g kg^-1 treatment. Furthermore, RBC of fish fed 1 or 1.5 g kg^-1lysozyme were significantly higher than other treatments. The same results were noticed in case of Hct which was higher in fish fed treated diet. These results indicated that dietary lysozyme affect haematological parameters rather than growth performance.

Shakoori, M., Hoseinifar, S. H., Paknejad, H., Jafari, V., & Safari, R. (2018). The effects of dietary lysozyme on growth performance and haematological indices of rainbow trout (Oncorhynchus mykiss) fingerling. International Journal of Aquatic Biology, 6(1), 31–36. https://doi.org/10.22034/ijab.v6i1.432

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