Effects on the Growth and Survival of Eggs and Embryos of the California Grunion (Leuresthes tenuis) Exposed to Trace Levels of Tributyltin.
Interim technical rept. Jan 84-Mar 85,
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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This experiment was conducted to determine the effects of various dose levels of tributyltin TBT on the eggs, embryos, and larvae of the California grunion Leuresthes tenuis. Both pre- and postfertilization effects were examined. The study demonstrated that the presence, during embryonic development, of tributyltin cation derived from antifouling coating leachates at concentrations from 0.14 to 1.72 micrograms TBTL had no adverse effects on either the hatch success or growth of embryonic fish. Continuous exposure to water concentrations of TBT at and below 1.72 microgramsL had no adverse effects on embryonic development and, in fact, significantly enhanced hatch success and stimulated growth suggesting a hormestic effect. Exposure of hatched larvae to similar concentrations of TBT for 7 days did not significantly affect survival. High dosing of TBT 74 microgramsL during fertilizing fertilization, representing possible chemically available interstitial concentrations, reduced hatching success by about 50 percent over controls. Similar dosing at 10 microgramsL showed no significant reduction in hatching success.
- Anatomy and Physiology