Effects of ammonia and nitrite on survival, growth and moulting in juvenile tiger crab, Orithyia sinica (Linnaeus) |
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| Authors: | Ja-Geun Koo Seong-Gil Kim Jung-Hoon Jee Jong-Man Kim Sungchul C Bai & Ju-Chan Kang |
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| Institution: | Incheon Fisheries Hatchery Research Institute, Incheon, Korea; National Fisheries Research and Development Institute, Busan, Korea; Department of Aquatic Life Medicine, Pukyong National University, Busan, Korea; Department of Aquaculture, Feeds and Foods Nutrition Research Center, Pukyong National University, Busan, Korea |
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| Abstract: | The effects of ammonia and nitrite on survival, growth and moulting were investigated in juvenile tiger crab, Orithyia sinica (carapace length 3.91±0.15 mm, carapace width 3.84±0.23 mm, n=440), after 30 days exposure to ammonia‐N (0, 20, 50, 100 and 150 mg L?1) and nitrite‐N (0, 50, 100, 150, 200 and 250 mg L?1) using a continuous flow system. Survival rates of tiger crab exposed to ammonia and nitrite decreased linearly with the exposure time and concentration. The growth rate of tiger crab exposed to 50, 100 and 150 mg L?1 ammonia was significantly lower than that of control crabs. The growth rate of tiger crab exposed to nitrite decreased at 150, 200 and 250 mg L?1 nitrite. During the ammonia and nitrite exposure, the intermoult period of the juveniles of tiger crab O. sinica was shortened between the first and second moult, and the number of moulting of crabs exposed to a higher concentration were significantly higher than that of control crabs. |
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| Keywords: | ammonia nitrite Orithyia sinica survival rate growth rate moulting |
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