Comparative studies were conducted on the integration of multiple technologies into the same breeding system and the traditional breeding model, so as to construct ecological breeding model in the ponds. Two experimental ponds and two control ponds were arranged with identical breeding species and proportion. In the experimental ponds, a number of single technologies, such as regulation of water quality by biofloc technology, pond bottom discharge, combination of micro-pore oxygenation and traditional oxygenation, oxygenation in feeding area and 360° air feeding, were integrated into the same breeding system. The control ponds applied traditional breeding ways, including feeding by ordinary bait casting machine and oxygenation by impeller aerator. The result showed that the ammonia nitrogen, nitrite nitrogen and nitrate nitrogen showed a trend of first rising and then falling in the experimental ponds and the control ponds, but the increase rate in the experimental ponds was lower than that in the control ponds, and the average values of the experimental ponds were lower than those of the control ponds respectively by 33.9 %, 69.1% and 40.3% at the end of the experiment. With the addition of carbon source, the pH of the experimental ponds showed a downward trend, fell to the minimum value of 7.18 at 40d and 45d respectively, and then gradually rose to 7.35 and 7.43 at the end of the experiment. However, the pH of the control ponds has been slightly increased since the beginning of the experiment, rose to the maximum value of 8.55 and 8.51 respectively, and then dropped slightly to 8.36 and 8.39 at the end of the experiment, with the mean of the experimental ponds 11.8% lower than that of the control ponds at the end of the experiment. Compared with the control ponds, the average survival rate of the main breed carp and crucian carp in the experimental ponds was respectively increased by 11.0% and 25.6%, the total production was increased by 21.5% on average, the feed coefficient decreased by 9.8% on average, the water consumption was reduce by 53.3%, and the growth discrete was reduced. The experiment integrated a number of single technologies into the same breeding system to effectively regulate the water quality of breeding ponds, improve the bottom quality, reduce toxic and harmful substances, reduce the occurrence of diseases, and achieve the purpose of saving water, green, ecological and environmental protection.
LIU Yanhui
,
LI Gaijuan
,
LIU Tiegang
,
YANG Bingkun
,
GAO Na
,
ZU Xiujie
. Experiment on comparison between ecological breeding and traditional breeding of large quantities of freshwater fish#br#[J]. Fishery Modernization, 2020
, 47(5)
: 32
.
DOI: 10.3969/j.issn.1007-9580.2020.05.005