Abstract
The use and validation of fish health monitoring tools have become increasingly evident due to aquaculture expansion. This study investigated the hematology and blood morphometrics of Piaractus mesopotamicus, Brycon orbignyanus, Oreochromis niloticus and Rhamdia quelen. The fish were kept for 30 days in 300-liter aquariums, after which they were anesthetized with benzocaine and blood was collected from caudal vessels. In comparison to other species, B. orbignyanus presented the highest hematocrit (Ht), RBC averages and Mean Corpuscular Volume (MCV) with a particular range of data. B. orbignyanus presented lower Ht, Hb, RBC averages and values, and Mean Corpuscular Hemoglobin Concentration (MCHC). Oreochromis niloticus presented lower Ht, Hb, RBC averages and values, and Mean Corpuscular Hemoglobin Concentration (MCHC). Rhamdia quelen and O. niloticus presented higher variation of White Blood Cells (WBC), neutrophils (Nf), lymphocytes (Lf), monocytes (Mf) and thrombocytes (Trb). Data of large axes (LA), minor axes (MA), surface (SF) and volume (VL) are in the same variance range. This study has demonstrated that hematological variances can occur between animals of different species as well as of the same species.
Highlights
Aquaculture has become one of the most important activities of the Brazilian agribusiness industry
Brycon orbignyanus presented the highest means of Ht, red blood cells (RBC) and mean cell volume (MCV) in comparison to other species
Hemoglobin levels tend to be relatively constant within the same species, but may considerably differ between different species (Cameron, 1969; Larsson et al, 1976)
Summary
Aquaculture has become one of the most important activities of the Brazilian agribusiness industry. The use and validation of standardized non-lethal and inexpensive methods to monitor fish health are being considered as a major issue to ensure the expansion of fish production (Hrubec et al, 2000). The establishing of hematological values should be adopted as a reference to evaluate fish health status (Tavares-Dias et al, 2002). Hematology is considered as one of the key tools to assess the health status index of different species because it is provide a reliable evaluation via non-lethal means (Satheeshkumar et al, 2012). There are few references regarding fish health status using such methodologies
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