Blood valves of some helminth-infected aquaculture fishes

Lopez, N.C. . Inst. of Biology

Blood valves of some helminth-infected aquaculture fishes

1990

Lopez, N.C. (Philippines Univ., Diliman, Quezon City (Philippines). Inst. of Biology)

Erythrocytes, thrombocytes, lymphocytes and neutrophils were the principal blood cell types found in the blood of Clarias batrachus, Ophicephalus striatus, Oreochromis mossambicus and Oreochromis niloticus. Eosinophids and basophils were observed in O. striatus but were absent in C. batrachus. Eosinophils but no basophils were seen in O. mossambicus and O. niloticus. Along with mature erythrocytes, immature, dividing, senile, and disintegrated erythrocytes were also observed from the circulating blood of the four fish species. From C. batrachus, eight species of helminths were recovered, namely, Cichlidogyrus sclerosus, Actinocleidus sp., Phyllodistomum sp., Opegaster minima, Gauhatiana batrachii, Bovienia serialis, Procamaleanus clarius, and Philometra sp. The parasites recovered from O. striatus were Diplostomulum sp., Camallamus ophicephali, Arqulus indicus, and Lernaea cyprinacea. C. sclerosus and Transversotrema larvae were collected from O. mossambicus and O. niloticus; from the latter, Gyrodactylus medius was also recovered. The average parasite burden was generally low. Parasitized and unparasitized fishes were active and appeared healthy. Blood valves of parasitized fishes showed few significant differences from those of unparasitized fish groups. No parasitized fishes showed few significant differences from those of unparasitized fish groups. No parasitized fish group showed significant reduction in mean hematocrit and RBC [red blood cell] count or significant increase in mean WBC [white blood cell] count and mean % neutrophils in comparison with unparasitized group of the same fish species.

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