Oxygen tolerance of Cetobacterium somerae isolated from the gut of freshwater fish and their environments

Article Type:
Research/Original Article (دارای رتبه معتبر)

Cetobacterium someraeis a predominant bacterium found in the gut of freshwater fish. However, being an anaerobic bacterium, its survival is believed to be prevented in oxygen-rich environments. Therefore, in this study, we investigated the oxygen tolerance of 83 C. someraestrains collected from the guts of freshwater fish, rearing water, and sediment of culture ponds and tanks. When placed in sterile bottles containing common carp-and goldfish-rearing water, C. someraeshowed a 1-log decrease after 24 hours, suggesting that this organism faces challenges in growing in rearing water. Subsequently, we inoculated the bacterial strains onto agar plates and exposed them to air for 12 hours to measure the oxygen inhibition index (OII). The OII values ranged from 0.01 to 4.65 among different strains, indicating significant variation in oxygen tolerance within the bacterium. Furthermore, the OII values varied considerably depending on the isolation source, with sediment, rearing water, and gut samples showing increasing values in thatorder. This suggests that oxygen tolerance plays a substantial role in the ecological behavior ofC. somerae.

International Journal of Aquatic Biology, Volume:11 Issue: 4, Aug 2023
301 to 304
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