Open AccessAcute and chronic toxicity of nitrate to fat greenling ( Hexagrammos otakii ) juveniles
Author(s) -
Yang Xiaohan,
Peng Lei,
Hu Fawen,
Guo Wen,
Hallerman Eric,
Huang Zhitao
Publication year - 2019
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/jwas.12603
Subject(s) - nitrate , biology , toxicity , chronic toxicity , hemoglobin , zoology , juvenile , acute toxicity , medicine , biochemistry , ecology
We evaluated the acute and chronic toxicity of nitrate to juvenile fat greenling Hexagrammos otakii . The 24‐, 48‐, 72‐, and 96‐hr LC 50 s of nitrate to 1.91 ± 0.7 g greenlings were 2,741, 2,413.5, 2,357.6, or 2,339.2 mg/L nitrate‐N, respectively. Greenlings (6.55 ± 1.83 g) were exposed to 5 mg/L (control) and 157 mg/L for 4 weeks in a recirculating aquaculture system. After 4 weeks, length, weight, feed conversion ratio, and specific growth rate were significantly ( p < 0.05) lower for nitrate‐exposed fish than for control fish. Elevated nitrate exposure was associated with decreased plasma hemoglobin concentration and red blood cell count. Our results demonstrate that nitrate poses a threat to greenlings and provide information that is useful for establishing water quality criteria for early life stages of this cultured fish. The sensitivity of greenlings to elevated NO 3 − should be evaluated at other life stages to determine how chronic exposure might impact survival, growth, health, reproductive success, and harvest quality.