• Korean Journal of Environmental Biology
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• v.41 no.2
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• pp.101-108
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• 2023

Recently, in relation to climate change, many studies have been conducted to predict the potential habitat area and distribution range of tilapia and the suitability of habitat for each species. Most tilapia are tropical fish that cannot survive at water temperatures below 10 to 12℃, although some tilapia can survive at 6 to 8℃. This study predicted habitable areas and the possibility of spreading of habitat ranges of tilapia (Oreochromis niloticus and Oreochromis aureus) known to inhabit domestic streams. Due to climate change, it was found that habitats in the Geum River, Mangyeong River, Dongjin River, Seomjin River, Taehwa River, Hyeongsan River, and the flowing in East Sea were possible by 2050. In addition, it was confirmed that tilapia could inhabit the preferred lentic ecosystem such as Tamjin Lake, Naju Lake, Juam Lake, Sangsa Lake, Jinyang Lake, Junam Reservoir, and Hoedong Reservoir. In particular, in the case of tilapia, which lives in tributaries of the Geumho River, Dalseo Stream, and the Nakdong River, its range of habitat is expected to expand to the middle and lower of the Nakdong River system. Therefore, it is judged that it is necessary to prepare physical and institutional management measures to prevent the spread of the local population where tilapia currently inhabits and to prevent introduction to new habitats.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1995.06a
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• pp.278-279
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• 1995

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1996.06a
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• pp.398-401
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• 1996

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1997.06a
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• pp.123-125
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• 1997

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1995.06a
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• pp.219-220
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• 1995

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1998.06a
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• pp.129.2-130
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• 1998

• Journal of fish pathology
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• v.10 no.1
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• pp.45-52
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• 1997

A protein-bound polysaccharide preparation, PS-K, isolated from Coriolus versicolor was evaluated for its ability to enhance resistance against Edwardsiella tarda, causal agent of classical edwardsiellosis in tilapia, Oreochromis niloticus. Fish treated with a dose rate of 0.1 mg PS-K $g^{-1}$ body weight were challenged by intraperitoneal injection of E. tarda with different concentrations. Against low burdens of injections($1.2{\times}10^7$ and $1.2{\times}10^8$ cfu/fish), PS-K treated fish did not show any mortality compared to 50% and 100% mortality of control groups, respectively. However there was no increase of resistance against challenge with high concentrations of E. tarda ($1.2{\times}10^9$ and $1.2{\times}10^{10}$cfu /fish) except few days delaying of death. Tilapia injected with PS-K one day after intraperitoneal inoculation of E tarda($1.2{\times}10^7$ cfu/fish) showed 100% survival rate compared to control group of 50% survival rate. The result indicates the potential of PS-K as a prophylactic agent in aquaculture. The increased antibody response in fish received PS-K one week prior to FKC administration suggested the influence of PS-K on the specific humoral immunity and increased resistance against bacterial infection.

• Journal of fish pathology
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• v.2 no.2
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• pp.91-98
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• 1989

The effects of Miyairi (Clostridium butyricum) on blood constituents and growth of cultured freshwater fishes, such as carp, tilapia and israeli carp were studied and then the following results were obtained : 1) All fishes produced the most efficient growth in 0.1% Miyairi-treated group. 2) Blood constituents of Miyairitreated group compared with those of contrul gruop showed no changes in RBCs. hemoglobin and hemato crit. and the increase in plasma protein and glucose. and the decrease in plasma cholesterol. 3) GOT level and GPT level in blood of Miyairi-treated group were almost equal to those in blood of control group.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.23 no.4
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• pp.334-338
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• 1990

The approximate compositions and the taste compounds of tilapia, Oreochromis nitoticus, cultured in freshwater and seawater for six months, were analyzed. As for the approximate compositions, there were little differences in moisture and protein contents of tilapia cultured in seawater and freshwater, but somewhat higher lipids and ash than that cultured in freshwater. Also, no significant differences in the content of free amino acids, nucleoli-des, betaine, TMAO, and total creatinine were observed between both groups.

• Journal of Aquaculture
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• v.7 no.3
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• pp.165-175
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• 1994

Attempts were made to find out nitrogen and phosphorus loads to aquatic environment resulting from feeding Nile tilapia (Oreochromis niloticus). Two different size groups, small and large, were used. The average sizes of small and large tilapia were 65.2 g and 389.2 g respectively, and three kinds of commercial diets were used for each size. The 3 kinds of commercial diets for tilapia contained in average 33.8% crude protein ($5.4\%$ nitrogen) and $1.4\%$ total phosphorus. The load of nitrogen and phosphorus were measured by subtracting the amounts of nutrients retained in the body of fish from consumed nutrients. Sixty, five percentage of total feces was excreted within 24 hours after feeding at $23^{\circ}C$. Nitrogen content in the feces was higher in large fish than small ones. The apparent digestibility of dietary protein for small and large tilapia was $90.0\%$ and $89.7\%$, respectively. Availability of dietary phosphorus for small and large tilapia was $44.7\%\;and\;51.4\%$, respectively. The total load of nitrogen and phosphorus per 1 metric ton of tilapia production was 49.5kg and 6.3kg, respectively, for small ones with feed conversion ratio (FCR) of 1.4, and 61.3 kg and 13.4kg, respectively, for large ones with the FCR of 1.8. Nitorgen balance appeared that small and large tilapia excreted $7.1\%\;and\;9.9\%$ of consumed nitrogen through fecal-nitrogen and $55.5\%\;and\;62.3\%$ through urine and gills, retaining $37.4\%\;and\;27.8\%$ in the body, respectively. These results show that small fish pollute less than large fish, excreting less and retaining more nutrients in the body.