Back to Search
Start Over
Hatching rate of Chinese sucker ( Myxocyprinus asiaticus Bleeker) eggs exposed to total dissolved gas (TDG) supersaturation and the tolerance of juveniles to the interaction of TDG supersaturation and suspended sediment
- Source :
- Aquaculture Research. 50:1876-1884
- Publication Year :
- 2019
- Publisher :
- Hindawi Limited, 2019.
-
Abstract
- Flood discharge containing excessive suspended sediments (SS) can result in total dissolved gas (TDG) supersaturation downstream of dams. It has been confirmed that high TDG levels and excessive SS cause serious threats to fish survival. To explore the effects of TDG supersaturation on the hatchability of Chinese sucker (Myxocyprinus asiaticus Bleeker) eggs, eggs were exposed to 100%, 125%, 130% and 135% TDG supersaturated water. The results showed that the hatching rates were 78.25%, 75.35%, 71.30% and 67.50% at the 100%, 125%, 130% and 135% TDG respectively. The hatching rate decreased with increasing TDG levels. Furthermore, acute lethality experiments were carried out to investigate the interaction of TDG supersaturation and SS on Chinese sucker. Half‐year‐old juveniles were exposed to TDG supersaturated water with SS concentrations of 0, 200, 600 and 1,000 mg/L, and the TDG levels were 125%, 130%, 135% and 140% respectively. The fish exhibited abnormal behaviours and signs of gas bubble disease. Mortality increased with increasing TDG levels and SS concentrations. The Chinese suckers only survived for 2.5 hr at 140% TDG and 1,000 mg/L SS. Moreover, an increase in SS in TDG supersaturated water could cause a decrease in the median lethal time (LT₅₀). When the TDG level reached 140%, the LT₅₀ declines significantly at 600 and 1,000 mg/L SS. The interaction of TDG supersaturation and SS was significant at LT₅₀ (F = 22.81, df = 9, p
- Subjects :
- 0303 health sciences
Supersaturation
biology
Hatching
Sediment
04 agricultural and veterinary sciences
Aquatic Science
biology.organism_classification
03 medical and health sciences
Flood discharge
Animal science
Myxocyprinus asiaticus
040102 fisheries
Sucker
0401 agriculture, forestry, and fisheries
Fish
Gas bubble disease
030304 developmental biology
Subjects
Details
- ISSN :
- 13652109 and 1355557X
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Aquaculture Research
- Accession number :
- edsair.doi...........b60b78d54f57e5e7a7f6c601976fbaf4