Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae) with Argulus sp. (Crustacea, Branchiura) infestation and treatment with organophosphate

Abstract

Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura) and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05) and special granulocitic cells (P<0.01) in the peripheric blood than the unparasitized (control) fish. Parasitized fish showed lower number of thrombocytes (P>0.05). Organophosphate treatment presented significantly reduction (P>0.05) in red blood cells (RBC) and hemoglobin

Acute toxicity of diazinon and its effects on hematological parameters in the Indian carp, Cirrhinus mrigala (Hamilton)

“…A commercial diazinon, Basudin 60 EC brand, with the active ingredient diazinon [0,0-diethyl-0-(2-isopropyl-6-methyl-4-pyrimidyl) phosphorothioate], with purity of 60% and dissolved in 40% acetone, purchased from Syngenta Ltd., Pakistan, was used to prepare test solutions of diazinon. Juveniles of C. mrigala were exposed to 6 different concentrations (5,10,15,20,25, and 30 mg/L) of diazinon to determine 1, 24, 48, 72, and 96 h lethal concentration values for the test fish. For the acute toxicity test, 20 fish were transferred to 40 L aquaria containing dechlorinated tap water.…”

Hematological changes in Eleginops maclovinus during an experimental Caligus rogercresseyi infestation

“…Sea louse cause a local inflammatory response and blood loss at the site of attachment but do not appear to suppress host defense mechanisms during the early stages of infestation (TAVARES-DIAS et al, 2007;WAGNER et al, 2008). Parasitic infestations can influence blood parameters, such as anemia and white cells count unbalances in other host fishes (HORTON;OKAMURA, 2003;MARTINS et al, 2004;SILVA-SOUZA et al, 2000;TAVARES-DIAS et al, 1999, 2002WAGNER et al, 2008).…”

Haematological characteristics associated with parasitism in bream, Abramis brama orientalis

“…The damage caused on the host depends on parasite species, type of spoliation of host tissue, number of parasites and the health status of the host (Tavares-Dias et al 1999). Pathological conditions in fish are manifested in the form of changes in the behavior (symptoms) and/or in the integrity of the tissues (lesions), leading to a decrease in weight gain and often, death (Roberts 1981).…”

“…Parasites may often cause anemia, which is characterized by reduced haemoglobin and hematocrit concentrations and erythrocyte number. Studies on haematological alterations fish has been performed on some species such as Cyprinus carpio (Ranzani-Paiva et al 1987) and Piaractus mesopotamicus (Tavares-Dias et al 1999) infected with Argulus sp. ; Mugil platanus infected with Trypanosoma, Hemogregarina, Trichodina, Monogenoidea, copepods and Hirudinea (Ranzani-Paiva et al 1997) and Oreochromis niloticus infected with I. multifiliis (Tavares-Dias et al 2002).…”