||Vertebral Abnormalities in Juvenile Inland Silversides 'Menidia beryllina' Exposed to Terbufos during Embryogenesis.
Middaugh, D. P. ;
Fournie, J. W. ;
Hemmer, M. J. ;
||Environmental Research Lab., Gulf Breeze, FL.
||c4 Oct 90
Marine biology ;
Menidia beryllina ;
Vertebral abnormalities ;
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Embryos of the inland silverside, Menidia beryllina, were exposed to a nominal concentration of 50 micrograms terbufos/1 during the first five days of embryogenesis. Silversides were maintained in clean dilute seawater until 37 days after hatching. Radiographs revealed compressed and fused vertebrae and dorsal-ventral misalignment of pre- and postzygapophyseal processes. Histopathological examination of individuals exposed to terbufos during embryogenesis revealed various vertebral lesions ranging from small hyperostoses to almost complete fusion of some vertebrae.