alexa In vivo humoral and cellular reactions, and fate of injected bacteria Aeromonas hydrophila in freshwater prawn Macrobrachium rosenbergii.
Agri and Aquaculture

Agri and Aquaculture

Fisheries and Aquaculture Journal

Author(s): Sahoo PK, Pillai BR, Mohanty J, Kumari J, Mohanty S,

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Abstract Live non-opsonized and opsonized Aeromonas hydrophila were injected into juveniles of freshwater prawn Macrobrachium rosenbergii to study the cells involved in phagocytosis, distribution of bacteria, cellular reactions and clearance of both forms of bacteria from the system. The bacteria were rapidly distributed to various tissues viz., gills, heart, hepatopancreas within 1h, and the tissues revealed haemocytic nodule formation after 3 h of injection. There was rapid clearance of both the forms of bacteria from the circulation. However, clearance efficiency was significantly (P < 0.05) faster in the case of opsonized bacteria at 12 h after injection. Similarly, the nodule formation, that was prominent in cardiac musculature, was rapidly eliminated from the tissues of the group injected with opsonized bacteria as compared to non-opsonized bacteria injected group, thus confirming the existence of opsonic factors in haemolymph of this prawn. In another experiment, various dose levels of bacteria were injected intramuscularly into prawns and haemolymph was collected after 1, 6, 24, 72 h and 7 days of injection to study various immune parameters. Although, no major alterations in the total and differential haemocyte counts were observed in bacteria injected prawns compared to control, there was a significant decline in phenoloxidase activity in the highest dose bacteria injected group at the earlier phase and a rise in agglutinin levels at the later phase of the experimental period in the higher dose groups. This article was published in Fish Shellfish Immunol and referenced in Fisheries and Aquaculture Journal

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