| cumulative impacts assessment along a large river, using brown bullhead catfish (ameiurus nebulosus) populations. | the effects of point-source and diffuse discharges on resident populations of brown bullhead catfish (ameiurus nebulosus (lesueur, 1819)) in the waikato river (new zealand) were assessed at sites both upstream and downstream of point-source discharges. at each site, the population parameters, relative abundance, age structure, and individual indices, such as condition factor, organ (gonad, liver, and spleen) to somatic weight ratios, and number and size of follicles per female, were assessed. ph ... | 2006 | 16833150 |