Further contribution related to identification of conditions for the use of river hopper barges as aquaculture facilities
2011
Škorić, S., Institute for Multidisciplinary Research, Belgrade (Serbia) | Mićković, B., Institute for Multidisciplinary Research, Belgrade (Serbia) | Višnjić-Jeftić, Ž., Institute for Multidisciplinary Research, Belgrade (Serbia) | Hegediš, A., Institute for Multidisciplinary Research, Belgrade (Serbia) | Regner, S., Institute for Multidisciplinary Research, Belgrade (Serbia)
The river hopper barge (59.9 x 6.65 m) used as aquaculture faciliti is located on the left bank of the Danube (km 1168 + 800, locality Krnjača), Serbia. The rearing unit is 40 m long, 4 m wide and 2 m deep (total volume 350 cubic meter), and can be separated in individual compartments at every 1.5 m. One compartment was established (V = 40 cubic meter, P = 29.4 square meter), and directly to it continuous water supply from Danube was applied by using submersible pump (10 – 20 cubic meter/h). The two air compressors, each of 170 l/min capacity, were used for aeration. Rearing compartment was stocked with 479.43 kg of carps (Cyprinus carpio) obtained from a commercial fish pond. In total 355 individuals of average weight of 1350.5 +/- 269.47 g were stocked on July 28th 2010. At the time of stocking a sample of 100 fish was taken and they were measured. The accomodation of the fish to the experimental conditions was monitored for 5 days and during this period fish were not fed. Fish feeding started on August 2nd 2010., and fish were fed with SOPROFISH 38/12 feed type. Two control samplings and total harvesting were performed on experimental days 42, 72 and 100, respectively. Sampled fish (n = 51 and n = 53) were anaesthesised (alchocol solution) and individual weight (+/- 1 g) and total lenght (+/- 1 mm) were measured; same procedure was applied for total harvesting. Mortality was observed daily. The feed conversion ratio (FCR) was calculated based on the consumed feed/weight gain ratio (died fish were not considered). Water temperature, pH and dissolved oxygen concentrations were measured daily while concentrations of ammonia, nitrites and nitrates were determined weekly. Rearing trial lasted 100 days, however, uptake of food was recorded on 67 days which had significant consequences on the final results. Respective to the initial values, final average weight showed an increase of 65.81%, while due to mortality (4.22%) weight gain amounted to 59.61% in total. On the other hand, feed conversion ratio was 1.52 representing satisfactory result.
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