Rainbow Trout Haematology Coinciding with Metabolic Requirement

Ghulam Nabi LONE; Qaiser Jahan SHAMMI; Shaukath Ali MIR; Imtiyaz Ahmed SHEIKH; Salman Rauoof CHALKOO

Authors

Ghulam Nabi LONE Department of Zoology, Govt. N. M. V College, Hoshangabad, MP
Qaiser Jahan SHAMMI Department of Zoology, Govt. N. M. V College, Hoshangabad, MP
Shaukath Ali MIR Department of Fisheries, Government of Jammu and Kashmir
Imtiyaz Ahmed SHEIKH Department of Zoology, Government of MVM College, Hoshangabad
Salman Rauoof CHALKOO Research and Analysis Wing, NHPC Funded Research Projects, Department of Fisheries, Government of Jammu and Kashmir

Keywords:

Age, fish, hematology, plasma chemistry, rainbow trout

Abstract

Rainbow trout (Onchorhynchus mykiss) are an important aquaculture species yet there are few diagnostic tools available to assess their health. There is little published information regarding age-related changes in blood values of juvenile fish. It is important to evaluate juvenile fish, as this is the time they are raised in aquaculture settings. Determining age-related changes in the blood values of fishes would further develop clinical pathology as a diagnostic tool, enhancing both fish medicine and the aquaculture industry. The results of standard hematology and clinical chemistry analysis were evaluated in juvenile rainbow trout at 4, 6, 9, 15 and 19 months of age. Values for PCV and RBC indices were significantly lower, and plasma protein concentration was significantly higher in younger fish. Total WBC and lymphocyte counts were significantly higher in fish at 6 and 9 months of age, while neutrophil and monocyte counts were higher at 6, 9 and 15 months. Eosinophil counts were significantly higher in 9 month old fish. The majority of hematologic values fell within previously established reference intervals, indicating that only slight modification to the intervals is necessary for evaluating hematologic results of rainbow trout at different ages. The following analytes deviated sufficiently from adult reference intervals to warrant separate reference values: plasma protein concentration at 4 months, WBC and lymphocyte counts at 15 and 19 months, and thrombocyte-like-cells at 9 months of age. Values for most biochemical analytes were significantly different among age groups except for creatinine and potassium concentrations. Comparisons with reference intervals were not made for biochemical analytes, because established reference intervals were not available.

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Author Biography

Salman Rauoof CHALKOO, Research and Analysis Wing, NHPC Funded Research Projects, Department of Fisheries, Government of Jammu and Kashmir

Working as Research Scientist, NHPC Funded Research Project (Fisheries)

Govt. of J&K

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