Due to the low water temperature in winter, the activity of fish digestive enzymes is relatively weak, so the requirements for feed quality are relatively high. Generally, it is better to feed powdered peanut bran, bean cake or compound feed, and the protein requirement content reaches 28% to 30%. The amount of feeding depends on the temperature of the water. When the water temperature is above 8°C, it is fed once every 2 to 3 days. The fed amount accounts for 1% to 2% of the total weight of the fish. When the water temperature rises continuously above 10°C on a continuous sunny day, the fish Increased activity should increase the amount of feeding. The feed can be concentrated in the middle of the fishing pond or in the water depth. The feeding rate is based on the size of the fish pond and the density of the fish. The daily requirement is more than 2%. At the same time, organic fertilizers with a leaven of 200-300 kg per acre should be added, once a day for 10 days, to maintain the best water quality for the winter, provide sufficient food organisms for the wintering of fish, and increase photosynthesis, so as to keep the water higher The amount of dissolved oxygen to promote fish growth and increase production and income.
This 50m distance measuring meter is made of two parts: the laser distance outside unit and the sole part laser measure module. Great distance range is from 3cm to 50 meters with ±1.5mm high accuracy. Digital distance measuring device is quick and reliable measure with one hand pushing the button. It is designed for hand helding, very convenient to put in your jacket pocket or trouser pocket.
1>. Easy to Use. It is very easy to learn how to use a Laser Distance Meter, it can measure distance with pressing a single button.
2>. Safety. Using a laser distance meter to measure is much safer than using a measure tape, for users do not need to climb up and down.
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Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserrangfinder.com