期刊
JOURNAL OF FISH BIOLOGY
卷 74, 期 4, 页码 891-905出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1095-8649.2008.02176.x
关键词
barium chloride toxicity; larval dispersal; larval marking; otolith microchemistry; Plectropomus leopardus; population connectivity
资金
- Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University (JCU)
- Marine and Tropical Sciences Research Facility (MTSRF)
- Oak Foundation
- National Science Foundation [OCE-0215905, OCE-0424688]
This study examined the toxicological and physiological responses of a commercially important coral-reef grouper, Plectropomus leopardus (Serranidae), to injection of enriched stable-isotope barium chloride (BaCl(2)) solution. Thirty adult P. leopardus were subject to one of two (138)BaCl(2) injection treatment groups (corresponding to dosage rates of 2 and 4 mg (138)Ba kg(-1) body mass), and a control group in which fish were injected with 0.9% sodium chloride (NaCl) solution. Fish from each group were sampled at post-injection intervals of 48 h and 1, 3, 5 and 8 weeks, at which time blood and tissue samples were removed from each fish. Residual concentrations of Ba and (138)Ba:(137)Ba ratios were measured in muscle, gonad, liver and bone tissues of each experimental fish. Elevated Ba concentrations were detected in all treatment fish tissue samples within 48 h post injection. Residual Ba concentrations decreased throughout the remainder of the 8 week experimental period in all tissues except bone. The BaCl(2) injection had no significant effects on measured whole blood variables or on the plasma concentrations of steroid hormones. Enriched Ba stable isotopes can therefore be used at low dosages to mark larvae of commercially important marine fishes, without adverse effects on the health of the fishes or on humans who may consume them.
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