Effects of pyrene exposure on sheepshead minnow (Cyprinodon variegatus) reproduction.

摘要: Polycyclic aromatic hydrocarbons are known to adversely affect survival, growth, and reproduction in many aquatic species. Adult female sheepshead minnow, Cyprinodon varietagus (SHM), were exposed chronic, low levels of pyrene (12.5, 25, or 50 μg/L nominal concentrations) the impact on reproductive ability larval survival was assessed. Viable egg production significantly reduced a dose-dependent manner following 28-d exposure SHM pyrene, confirming dysfunction. Gonadosomatic index (GSI) values unchanged with exposure, but histological assessment ovarian development showed significant differences phases for 28 d, greater percentage prespawning nonspawning females observed two highest concentrations. The embryos successfully hatching varied among treatments, lowest hatch occurring at 25 μg/L, fish 14 d not different. These results suggest that chronic maternal concentrations has potential population structures by altering output as well embryo/larval rates.