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The aim of the present study is to compare the hematological parameters of two snow trout fish species, Schizopyge plagiostomus and Schizopyge niger, inhabiting two different habitats, to establish and compare baseline information about the hematological profile of the two species using standard methodology and light microscopy. Results showed significant (P < 0.05) differences in hematological parameters of the two species. Significantly higher hemoglobin (Hb), red blood cell count (RBC) and hematocrit (Hct) values were recorded in S. plagiostomus as compared to S. niger. Conversely, the values of thrombocyte count (TC), white blood cell count (WBC) and mean corpuscular volume (MCV) were higher in S. niger in comparison to S. plagiostomus. The erythrocyte dimensions of these two species were distinguished and characterized under light microscopy; different morphometric characteristics were observed, such as larger size and smaller number in S. niger as compared to S. plagiostomus. The variation in hematological parameters and morphometric characteristics of erythrocytes between the two species inhabiting different environments might be due to their divergent physiological activity level, movement, metabolic rate and feeding behavior. This study will provide essential tools for physiologists and pathologists in monitoring the health status of these fish species in particular and fish species in general.

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Length-relationship (LWR) estimation of fishes can provide important information in understanding the growth rates of fish population and their dynamics (Anderson et al., 1996; Al Nahdi et al., 2016). Length-weight relationship of fishes plays a vital role in fisheries and fish biology as it allows the assessment of the mean body weight of the fish in a particular length set by evaluating a mathematical relation between them (Beyer,

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