Abstract: | The quantity of organic seston resulted from faeces and unconsumed nutriments from intensive fish farming, can often exceed the capacity of sediment assimilation, determining the intensification of anaerobic processes of bacterial decomposition, guiding to increased H2S and NH4 concentrations with important perturbations in the benthic community structure (Growen et al. 1988); the amplitude of these modifications depends on lake limnological type and size (Koricka & Zdanowski 1981). In Izvorul Muntelui – Bicaz reservoir, the aquaculture of rainbow trout in floating cages experimentally began in 1972, arising nowadays at an industrial production of approximately 70 mt/year. Previous research on the reservoir was not orientated to illuminate the relation between aquaculture and biotic components of the ecosystem (Miron et al., 1983). Our investigation, run in 2004, identified some changes in the structure of benthic macroinvertebrate community, in the aquaculture area, compared to control situations. In this study we present a first synthesis of our observations, to serve like a reference for next research. |
