WATER QUALITY maria hayward
tosai, which were fed once a day with a sinking pellet food, were kept in this pond.
Mud pond 4: Horinouchi
The Horinouchi region is home to 14 mud ponds belonging to Marudo Koi Farm. The test pond had a size of around 25m by 20m, with an average depth of 0.7m. Due to the amount of mud ponds in this region, there is not always fresh mountain water available. Every three or four days the water supply was switched between adjacent ponds. At the time of testing there were 750 tosai in this pond.
Marudo’s indoor ponds Marudo Koi Farm has six different koi houses
in different areas. These houses have mountain, ground and/or tap water as a supply. During summer the nisai which were not good enough to put in a mud pond were kept in inside ponds.
Mud pond 1: Shiditar
Marudo owns ten mud ponds in the Shiditar region. The dimensions of the pond where the water samples were taken were around 25m by 25m, with an average depth of 0.6m. The mud ponds of this complex only get fresh water during rainfall. In the period in which the water was analysed, this pond contained around 1,000 tosai. Once a day these tosai were fed with sinking pellets.
Mud pond 2: Okaado
The Okaado region houses four mud ponds. The one in which the water was analysed was 45m by 45m, with an average depth of 1.5m. This pond had a continuous supply of mountain water. Table 1 shows the data of the water supply per pond. During the research period, around 2,500 tosai were in this pond, and they were fed once a day with meal feed.
Mud pond 3: Myokeyama Marudo owns 12 mud ponds in the Myokeyama region. The mud pond from which I took a weekly water sample had a dimension of 20m by 25m, with an average depth of 0.7m. This pond also has a continuous supply of mountain water. Unfortunately the data of this supply water is not known. In the research period around 900
Concrete pond 5: Nigoro Gars This koi house contains eight ponds. Four of them were equal in size and also combined as one system. The size of one of these ponds was 4m by 4m by 1.5m, with a total content of 24,000 litres. This makes a total of 96,000 litres.
The filtration consisted of a big, concrete two-chamber filter, filled with matala matting and smooth substrate (average diameter of 4cm). This system was supported by a 40,000 litres per hour pump and a continuous supply of mountain water. Around 4,000 litres a day was supplied.
Next to this, the sediment chamber was rinsed every day. In these four ponds around 1,800 nisai measuring 20-40cm were swimming. These were fed once a day with a floating pellet.
Concrete pond 6: Muikaichi Muikaichi contains 14 ponds. There are six equally sized ponds with a dimension of 6.85m by 2.85m by 1.3m, with a total content of 25,000 litres. The filtration of each pond consisted of a multi-chamber filter from 10.25m by 1.0m by 1.3m, with a volume of 13,000 litres. This brings the total volume of one pond to 38,000 litres. The filtration had four separated
…the nisai which were not good enough to put in a
mud pond were kept in inside ponds
26 KOI CARP
Table 1: Composition of the water supply to the different ponds Pond
1 Shiditar 2 Okaado
3 Myokeyama 4 Horinouchi 5 Nigoro Gars 6 Muikaichi
Rain
Mountain Mountain
(°C) (ppt) –
13.3 x
15.0 (mg/l) –
0.02 x
0.09
Type of Temp TDS pH NH3 NO2 NO3 water
Mountain 23.1 0.08 6.1 0 Mountain 15.4 0.15 7.1 0 Tap
7 Sanbusho A-house Ground 14.8 0.07 5.8 0 8 Sanbusho B-house Ground 14.8 0.07 5.8 0
KH GH
– – – – – – 6.6 0 0 0 2.0
x x x x x x 0 0
10 2.0 0 4.0
7.2 0 0 0 2.0 0 0
13 1.5 13 1.5
4.0 3.0 3.0 3.0
(mg/l) (mg/l) (°dH) (°dH) 2.0 2.0
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