Chronic effects of dietary selenium on juvenile Sacramento splittail (Pogonichthys macrolepidotus)

Swee J. Teh, Xin Deng, Dong Fang Deng, Foo Ching Teh, Silas S.O. Hung, Teresa W.M. Fan, Jee Liu, Richard M. Higashi

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


The chronic effects of dietary selenium (Se) exposure in juvenile Sacramento splittail (Pogonichthys macrolepidotus) were investigated in the laboratory. A total of 960 (40 fish per tank, 3 tanks per diet) 7-month-old juvenile splittail were fed one of eight Purified-Casein diets supplemented with selenized yeast for 9 months in a flow-through system. These diets contained the following: 0.4 (control), 0.7, 1.4, 2.7, 6.6, 12.6, 26.0, and 57.6 mg of Se kg-1 dry weight. Survival, Se tissue concentration, growth, gross morphology, and liver histopathology were assessed at 5-and 9-month of exposure. Mortalities occurred only in the two highest Se treatments and were accounted for 8.3 and 18.3% at 5-month and 10.0 and 34.3% at 9-month, respectively. Liver and muscle Se concentration were significantly correlated with dietary Se concentration. Fish exposed to 0.4-12.6 mg of Se kg-1 diets had reached equilibrium in liver Se concentration by 5 month. Splittail fed diets at concentrations ≥26.0 mg of Se kg-1 had not reached equilibrium in liver, and muscle Se concentrations and grew significantly slower (p < 0.05) at 5- and 9-month exposure. Se-induced deformities were observed in fish fed ≥2.7 mg of Se kg-1 diets at 5-month and in fish fed ≥0.7 mg of Se kg-1 diets at 9-month. Fish fed 26.0 and 57.6 mg of Se kg -1 diets had higher liver lesion scores at 5-month while fish fed 6.6 and 57.6 mg of Se kg-1 diet had higher liver lesion scores at 9-month. Results indicate that survivals, growth, changes of tissue Se concentrations, and histopathology of juvenile splittail were dose-dependent, but their response thresholds to dietary Se concentrations differed and depended on treatment concentrations and duration of exposure. Chronic exposure to 6.6 mg of Se kg-1 diet induced deleterious health effects that can potentially impact survival of juvenile splittail.

Original languageEnglish
Pages (from-to)6085-6093
Number of pages9
JournalEnvironmental Science and Technology
Issue number22
StatePublished - Nov 8 2004

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry


Dive into the research topics of 'Chronic effects of dietary selenium on juvenile Sacramento splittail (Pogonichthys macrolepidotus)'. Together they form a unique fingerprint.

Cite this