Estrogenic pollutants: impacts on reproductive health of fish in Laguna de Bay [Philippines]
2018
Paraso, M.G.V.
Laguna de Bay receives a complex mixture of industrial effluents, agricultural runoff, and municipal wastewaters from its extensive watershed. Recent studies detected significant levels of the hormone 17 betha-estrodoil (E2) in lake water samples that confirm its contamination with human and/or animal excreta. Moreover, increased estrogen biomarker responses in collected fish were observed. Both caged and feral male common carp (Cyprinus carpio) demonstrated testicular abnormalities and vitellogenin synthesis that are indicative of exposure not only to E2 but also to potential estrogen-mimicking compounds. Although no obvious signs of illness were seen in fish, exposure to estrogenic pollutants could decrease fish fecundity, which might have negative implications on the sustainability of fish populations.
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