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- Title
Responses of Takifugu obscurus fertilized eggs and larvae to increased ammonia exposure.
- Authors
Wang, Jun; Li, Jiajia; Xu, Nuo; Li, Jing; Li, Ziheng; Chen, Yafen; Yang, Zhou
- Abstract
Ammonia is a common toxicant in aquatic systems; this substance has become a critical threat to fish, especially in early life stages. This study aimed to evaluate the effects of unionized ammonia (NH-N: 0, 0.068, 0.138, 0.206, 0.275, 0.343, 0.412, and 0.481 mg L) on fertilized eggs and larvae of obscure puffer Takifugu obscurus, a fish species with potential economic value. Results showed that hatch time was significantly retarded and hatch rate was significantly decreased as NH-N concentrations increased; newly hatched larvae exhibited high rate of abnormalities and low viability. The survival rate of larvae also decreased significantly as NH-N concentrations increased; larvae could tolerate NH-N to a less extent than embryos. NH-N also caused a significant decrease in superoxide dismutase (SOD) and Na/K ATPase activities but not in malondialdehyde (MDA) levels of larvae. Two-way ANOVA indicated that there was a statistically significant interaction between NH-N concentrations and exposure times on SOD activity but not on Na/K ATPase activity. Such responses indicated that an increase in ammonia concentration in surface water may negatively affect the early development of T. obscurus and thus likely impair population recruitment and persistence of this fish species.
- Subjects
AMMONIA poisoning; SUPEROXIDE dismutase; OXIDATION of ammonia; NITROGEN compounds; MALONDIALDEHYDE
- Publication
Environmental Science & Pollution Research, 2015, Vol 22, Issue 20, p15976
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-015-4815-x