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Betanoda virus is one of the most important and emerging groups of viruses known to infect around 40 species found to be worldwide in distribution. The most common and virulent target of infection for this virus is (Lates Calcarifer) (barramundi). It is found that the expression of MX protein is found to be the more susceptible reason for this viral infection. Considering this current study including characterization to structure prediction revolves around the MX protein as a target. The progression of this study describes the amino acid sequence of MX protein was retrieved from UniProt database in Fasta format and further primary structure analysis and characterization including nature of amino acids, instability index reading, GRAVY, determination of phosphorylation as well as signal peptide cleavage sites was done with the help of various tools. Secondary structure prediction has proceeded through SOPMA server analysis revealed that MX protein has mixed secondary structure, i.e., mostly alpha-helix and beta-turn. The progression of this work prediction of a 3D structure along with functional site prediction of MX protein of Fish (Lates Calcarifer) is done through standard modeling tools. The 3D structure of this protein of (Lates Calcarifer) as documented in this study may provide a valuable aid for designing an inhibitor or better ligand against viral nervous necrosis disease and could play a vital role in drug design.

The present study was conducted to investigate the bacterial pathogens involved in the mortality of cultured Pangasianodon hypophthalmus. Diseased fish samples were collected from Maharashtra, India for the isolation of pathogenic bacteria. The pathogenic bacterial isolates were identified using 16S rRNA gene sequencing analysis which revealed that they were 99% identical with Aeromonas jandaei. The bacterial isolates were further characterized using biochemical methods. The lowest bacterial dose which caused 50% cumulative mortality (LD50) in Pangasianodon hypophthalmus was 8.84 X 105 CFU per fish. This was achieved by injecting the fish intraperitoneally with pure culture of A.jandaei isolated from diseased fish. Histopathogical studies revealed necrosis hemorrhaging, and other cellular alterations of different tissues of collected organs viz. gill, liver, and kidney of P. hypophthalmus, observed with the diseased conditions.

The study was performed over a period of 60 days to evaluate the effect of dietary carrageenan on growth, hematology, biochemistry, and innate immunity in rohu Labeo rohita. A basal diet supplemented with iota (i)Carrageenan at 5, 10 and 20g/kg was fed to three different groups of fish for 60 days. The fish were examined 15, 30, 45, and 60 days after commencement of the study. Parameters for growth (absolute growth, specific growth rate, and percentage weight gain), hematology (total erythrocyte count, total leucocyte count, thrombocyte count and hemoglobin value), biochemistry (total serum protein, albumin, globulin and albuminglobulin ratio), and innate immunity (nitroblue tetrazolium NBT, and myeloperoxidase MPO, activity) were monitored to assess the effect of the iCarrageenan based diet in L. rohita. All the parameters examined (growth, hematology, biochemistry, and innate immunity) increased significantly (P<0.05) in carrageenan-fed groups compared to the control group. However, the highest values for those parameters were found on the 60th day in the group which was fed a 10 g/kg i-Carrageenan diet. The study suggests that a 10 g/kg diet of i-carrageenan enhances immunity and the overall health status in L. rohita.