当前位置： SCI文献检索 > ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY期刊下所有文献 > Single and joint action toxicity of heavy metals on early developmental stages of Chinese rare minnow (Gobiocypris rarus).

Single and joint action toxicity of heavy metals on early developmental stages of Chinese rare minnow (Gobiocypris rarus).

Abstract：

:In this work, acute toxicities of heavy metals (Cu, Zn and Cd) were evaluated singly or in mixtures on Chinese rare minnow (Gobiocypris rarus) in its early stages of development (embryos, larvae). Normal embryos not later than 3 h post-fertilization and newly hatched larvae were selected for the tests. The embryos were exposed to the metal solutions studied until developing to the stages of somite formation (15 h), tail detachment (25 h 10 min), heart-beat visible (34 h 10 min), pectoral fin bud appearance (47 h 40 min) and hatching (75 h), respectively. Exposures of the larvae were continued for 24 h. Results from the single toxicity tests revealed that the mortality of embryos increases obviously with increasing exposure duration. G. rarus appears to be more sensitive to heavy metal exposures at larval stage than at embryonic stage. The toxicity order of the tested metals was Cu>Cd>Zn for the embryos and Cu>Zn>Cd for the larvae with LC₅₀ as the toxicity criterion. These data suggest that the sensitivity of G. rarus to heavy metals (Cu, Zn and Cd) is different and it depends on the exposition duration and the stages of fish development. Among the metals tested, Cu is the one most toxic to G. rarus at its early development stages. In addition, results of the mixture experiments showed that binary combinations of Cu-Zn and Cu-Cd had strictly synergistic lethal effects on the larvae. The enhanced toxicity suggested inclusion of mixture considerations in the risk assessment of heavy metals might be recommended.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Zhu B,Wu ZF,Li J,Wang GX

doi

10.1016/j.ecoenv.2011.07.033

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

2193-202

issue

8

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(11)00220-X

journal_volume

74

pub_type

杂志文章

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