Several diagnostic tools are available for veterinarians and fish health professionals to evaluate fish health and their abnormalities. However, reference data regarding the character and size of fish blood cells are limited. The purpose of this study was to analyze the morphology and morphometry of normal blood cells in zebrafish (Danio rerio), common carp (Cyprinuscarpio carpio), and tilapia (Oreochromis niloticus). To get a representative sample, we took blood from ten 6-mo old healthyfish from each species. Fish were purchased from an ornamental fish market and the local government fish breeding centerin Yogyakarta, Indonesia. A total of 100 erythrocytes and a maximum of 30 leukocytes (neutrophils, eosinophils, basophils,lymphocytes and monocytes) were randomly sampled and analyzed qualitatively and quantitatively, including morphometricanalysis of both the long axis (LA) and short axis (SA) of these cells. All data obtained were analyzed using ANOVA statisticaltests to compare the blood cells in each species with SPSS software. The findings revealed distinct differences in bothmorphology and morphometry of the blood cells among the species. Basic knowledge obtained from this research will aidin the development of biomarkers and other ancillary diagnostic tools for further hematology research, conservation, andclinical diagnosis in these 3 fish species.

The phytochemical components of avocado seeds (Persea americana Mill) consist of alkaloids, flavonoids, tannins and saponins, so that they have the potential as antibacterials. The aim of this study was to determine the ability of Persea americana Mill extract to inhibit the growth of Staphylococcus aureus through inhibition zone observation and the ability to accelerate wound healing infected by S. aureus through observation of wound closure and cytopathology.  Persea americana Mill were extracted using maceration method with 70% ethanol. The activities of this extract were tested by diffusion disc agar method. Biomedical tests were carried out on anaestetic Wistar rats whose were S. aureus infected wounds  and treated with Persea Americana Mill extract. Based on the results of the antimicrobial test, avocado seed extract has a inhibitory effect on the growth of S. aureus at a concentration of 6.25% and best at a concentration of 100% compared to the control. Tests in experimental rats showed the effect of wound healing on the 2rd day after giving the extract Persea americana Mill ointment, faster than the control, which was need 4 days of wound closure. Cytopathology results showed that leukocyte activity was more prominent in rats treated with avocado seed extract compared to control rats. Avocado seeds as byproducts have the potential to be new herbal medicines that can be used as antimicrobials of S. aureus which have been confirmed to be resistant to various antibiotics.

Staphylococcus aureus is often the cause of various diseases and food poisoning in animals and humans. Avocado seeds (Persea americana, Mill) contain important compounds that have antimicrobial activity. This study aimed to observe the hematological dynamics of mice (Mus musculus domesticus) infected with S. aureus and induced by P. americana extract. BALB/c male mice aged 12 weeks were divided into 6 groups of 5 in each group, named K-1, K-2, K-3, K-4, K-5, and K-6. All groups were infected with S. aureus 1x108 CFU cell/mL intraperitoneally (IP) on day 0. After the blood sample was taken, then K-1 was given a single dose of tetracyclin 130 mg/kg BW, K-2 was given 130 mg/kb BW oferythromycin, K-3 was given aquabidest (placebo), K-4 was given P. americana extract 300 mg/kg BW, K-5 at a dose 600 mg/kg BW and K-6 at a dose 1200 mg/kg BW. The treatment was given for 7 consecutive days, then a second blood sample was taken and analyzed with the VetScan-HM5 analyzer and interpreted. It was concluded that S. aureus infection caused leukopenia and was potentially followed by lymphopenia, neutrophilia, and monocytosis. The occurrence of microcytosis can lead to anemia, which can be categorized as microcytic hypochromic or normocytic normochromic. Administration of P. americana extract at a dose 300 mg/kg BW (K-4) for 7 days after S. aureus infection was found to be effective in improving hematological values in mice back to normal.