Hematology and productive performance of nile tilapia (Oreochromis niloticus) naturally infected with Flavobacterium columnare

Abstract

Columnaris disease is one of the main causes of mortality in tilapia rearing and is responsible for large economic losses worldwide. Hematology is a tool that makes it possible to study organisms' physiological responses to pathogens. It may assist in making diagnoses and prognoses on diseases in fish populations. The hematological variables of nile tilapia were studied in specimens with a clinical diagnosis of columnaris disease and in specimens that were disease-free. The total erythrocyte count, hemoglobin rate, hematocrit percentage, mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), mean corpuscular volume (MCV), organic defense blood cell percentages (leukocytes and thrombocytes) and hepatosomatic and splenosomatic index were determined. The results showed that there were changes in the erythrocytic series and in organic defense blood cells, in the fish infected with the bacterium, with reductions in erythrocytic variables and significant increases in the numbers of circulating lymphocytes and neutrophils.

Dietary Aloe vera supplementation on growth performance, some haemato-biochemical parameters and disease resistance against Streptococcus iniae in tilapia (GIFT)

“…Sebastião et al [72] reported a neutrophilia response in Nile tilapia after Flavobacterium columinare challenge, similar to our study; they also simultaneously reported an increase in circulating lymphocyte counts, which contradict our findings. Moreover, Ali and Ansari [73] reported a synchronized neutrophilia and lymphopenia response in common carp after monogenean (flukes) challenge, which is in agreement with our findings.…”

Effects of feeding regimen of dietaryAspergillus oryzaeon the growth performance, intestinal morphometry and blood profile of Nile tilapia (Oreochromis niloticus)

“…In this study, growth rates were improved by ASP supplementation, and haematocrit, haemoglobin levels, RBC counts and WBC counts were also upregulated. It has been assumed that dietary probiotics can upregulate blood biomarkers in fish as indicators of improved health status (Panigrahi, Kiron, Satoh, & Watanabe, ; Serbastiao, Nomura, Sakabe, & Pilarski, ). Probiotics have a competitive ability against pathogenic bacteria in the GIT, by the production of peroxide, bacteriocin, siderophore and lysozyme enzymes which may result in improved immunity and health status (Fuller, ).…”

Aeromonas shuberti as a cause of multi‐organ necrosis in internal organs of Nile tilapia, Oreochromis niloticus

“…However, with the rapid development of the tilapia culture industry, various bacterial diseases frequently outbreak due to intensified culture and high stocking density conditions of intensive farming. Pathogens, such as streptococcosis (Anshary, Kurniawan, Sriwulan, Ramli, & Baxa, ; Verner‐Jeffreys et al., ), edwardsiellosis (Kwon, Nam, Kim, & Kim, ; Park & Jeong, ; Soto, Illanes, Revan, Griffin, & Riofrio, ; Soto et al., ), columnaris disease (Dong, Lafrentz, Pirarat, & Rodkhum, ; Sebastiao, Nomura, Sakabe, & Pilarski, ), francisellosis (Assis, Tavares, Pereira, Figueiredo, & Leal, ; Ortega et al., ; Sebastiao, Pilarski, Kearney, & Soto, ) and motile aeromonas septicaemia (Dong et al., ; Li & Cai, ; Soto‐Rodriguez, Cabanillas‐Ramos, Alcaraz, Gomez‐Gil, & Romalde, ), have resulted in substantial economic losses to the local aquaculture industries.…”