| Summary: | In this study, local environmental condition (impact) of rainbow trout
(Oncorhynchus mykiss Walbaum,1792) cage farm with nearly 274 tons of total
production capacity using the B-investigation of the MOM (Modelling-Ongrowing
fish farms- Monitoring) system in Karaova Dam Lake (Kırsehir) was
determined. For this purpose, sediment
samples, which were taken from cage bottom in October (2015) and April (2016),
were evaluated based on three groups of parameters -biological (macrofauna
presence: Group 1), chemical (pH and redox potential: Group 2) and sensory
(outgassing, colour, odour, consistency, thickness of deposits : Group 3).
Moreover holding capacity of the cages was estimated using two different
oxygen-based models. Benthic macrofauna were not found in all sediment samples
for cage farm. The result suggested that benthic environment of the cage farm
is an "unacceptable" condition. The sediment conditions according to
the chemical parameters were detemined as "transition area".
According to sensory parameters, the local environmental condition of cage farm
was evaluated as "partially acceptable". Therefore, it is concluded
that the possible negative effects of the cage culture activities on the
benthic environment will increase over the long-term because of the results of
environmental quality parameters of sediment. Holding capacity in the cage farm
was assessed as 0.64 kg m-3 in October (2015) and 3.71 kg m-3 in April (2016)
according to Beveridge (1984) Model. In addition, using Tookwinas et al.
Model (2004), holding capacity was found
as 10.91 kg m-3 and 72.47 kg m-3 in October (2015) and April (2016),
respectively. As a result, oxygen-based models did not indicate appropriate
results for the orientation of cage culture activities. However, the fast and
easily applicable parameters, proposed in the scope of present research, are
thought to be used effectively in management of cage farms with different
capacities and monitoring of the environmental impacts of fish farming in
inland waters.
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