| gonadosomatic index and testis morphology of common carp (cyprinus carpio) in rivers contaminated with estrogenic chemicals. | to study the effect of estrogenic chemicals on fish, the gonadosomatic index (gsi = [testis weight/body weight] x 100) and testis histology of mature common carp (cyprinus carpio) from 2 contaminated sites (ishizu and wada rivers, osaka) and a control site were examined between june 1998 and march 2001. the concentration of nonylphenol, bisphenol a and 17beta-estradiol in the ishizu river was 3-4 times higher than in the wada river. in the pre-breeding and breeding seasons, there were no signifi ... | 2002 | 12419869 |
| the life cycle and molecular phylogeny of a gorgoderid trematode recorded from the mussel nodularia douglasiae in the yodo river, japan. | in 2009, a novel larval trematode of the family gorgoderidae was found in the gonads of nodularia douglasiae (unionidae) from the lower reaches of the yodo river, osaka prefecture, japan. this is the first collection of trematodes in a unionid mussel in japan. we investigated the morphology and life cycle of the trematode, and conducted a molecular phylogenetic analysis with other gorgoderid species, both those collected in the yodo river water system and those reported in the literature. immatu ... | 2015 | 25220581 |