The present investigation attempted to evaluate the existence and survival of spoilage
microorganisms in four common sea fishes (Poma, Rupchanda, Koral and Tuna) available
in Bangladesh and to determine the effects of cooking temperature to optimize the growth
of fish microflora. Moreover, the status of fish in frozen condition after cooking was also
studied. A total 4 categories of sea fishes were collected from the local shops in Dhaka
city. Raw, cooked and frozen fish samples were analyzed for the existence of pathogenic
bacteria through the conventional cultural techniques and the confirmative biochemical
identification procedures. Total viable bacteria were present in all four fish samples in
raw, cooked and frozen condition up to 6 log CFU/mL. Most of the raw fish samples were
found to harbor a huge population of microorganisms up to 5 log CFU/mL including the
fecal coliforms. Several specific bacterial species like E. coli, Klebsiella spp., Salmonella
spp., Shigella spp., Staphylococcus spp., Pseudomonas spp. and Vibrio spp. were present
in raw samples. However, the microbial load reduced from the fish after cooking and the
status was static in frozen condition. Thus, the incidence of fecal coliforms in raw fish
may be considered as a serious threat to the public health upon consumption of such
fishes.
Globally, the ornamental fish business has a high demand for its popularity as well as for its profitability. However, microbial contamination, nutrient depletion and accumulation of organic materials are the major factors in an aquafarming system which can cause death of aquatic animal and causes financial losses. This study aimed to determine the physicochemical and microbiological quality of fish aquarium water. Water of different time interval after treatment (7 days, 20 days, 30 days, 60 days, 90 days) were taken from the different aquariums. A set of physicochemical parameters such as temperature, transparency, pH, conductivity, dissolved oxygen, total dissolved solids, alkalinity, total hardness, conductivity were found within the approved standard concentration for fish. The present study also reveals the microbiological status of the aquaculture water where the total viable count ranging from 2.20×104 to 4.20×104 cfu/ml. Escherichia coli, Staphylococcus spp., and Pseudomonas spp. were present in all samples. Antimicrobial susceptibility tests were also done to determine the antibiotic resistance pattern of microbes isolated from aquarium water.
Stamford Journal of Microbiology, Vol.11 (1) 2021: 20-23
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