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Title: Parasitic, fungal, and bacterial pathogens involved in health problems of Siberian sturgeon (Acipenser baerii Brandt 1869) reared in Iran: clinical and pathological findings

Biography:

Dr. Hooman Rahmati-Holasoo completed his Ph.D. at the age of 28 years from the University of Tehran. He is an associate professor of aquatic animal health. He has published more than 50 international papers in reputed journals and has been serving as a reviewer of many international journals. His main research is on ornamental and sturgeon fish diseases.

Abstract

Sturgeons have been referred to as ‘primitive fishes’ among the bony fishes because their morphological characters have remained relatively unchanged. Farming sturgeons is an economically important profession in a number of countries in the world. Based on the nutritional value and demand for caviar and meat production, sturgeons are considered one of the most high-valued food fish. Siberian sturgeon (Acipenser baerii Brandt 1869) is a marine acipenseriform food fish, which has been classified into the Acipenseridae family. Due to the interest of several fish farms in culturing sturgeon in Iran and the lack of sufficient relevant data, this study investigated parasite, fungus, and bacteria-related health problems of an acipenseriform food fish species, the Siberian sturgeon (Acipenser baerii) from five fish farms between November 2018 and November 2021 in central Iran. Mortality of Siberian fish was reported in 5 sturgeon farms. The different types of pathogens found in these fish were investigated until the fish reached about 3 kg of weight (2+ years). A number of parasitic disease pathogens (monogenean Diclybothrium armatum and protozoan Trichodina sp.), fungus Saprolegnia sp., and bacteria Aeromonas sp. were identified in the moribound fish. Samples for histopathology were taken and studied under light microscopy. Then treatment of alive fish was performed according to the identified pathogens. And mortalities were stopped. In conclusion, due to the relatively large variety of these pathogens, consideration of few applied measures including full observance of the quarantine period, setting up an appropriate filtration and ventilation system, periodic use of efficient disinfectant compounds, and use of cement and fiberglass ponds as an ideal alternative for the earth ponds, are recommended to promote the fish health condition and prevent the development of infectious diseases in sturgeon fish farms.