Koi's feeding management matters needing attention
Koi is a relatively large fish with high ornamental value. As the level of consumption increases, the number of fish farmers in Koi increased year by year, and several points for attention are raised for the breeding and management of earthworms for reference. 1, water quality requirements Water temperature Koi life of the water temperature range of 2 ~ 30 °C, the optimal living water temperature is 20 ~ 25 °C. In this temperature of water, koi carp swims actively, has a strong appetite, and is physically strong and colorful. However, the water temperature cannot be changed suddenly, and the temperature difference during water exchange cannot exceed 3°C. Hardness Koi enjoys living in a low-quality water environment. Soft and hard water can keep Koi (usually tap water is soft water, spring water, well water is hard water), but should avoid sudden changes from soft water to soft water into the water, so as to avoid fish allergic reactions. pH (pH) Koi is required to live in slightly alkaline water, with a suitable pH of 7.2-7.5. Koi do not like sudden changes in water quality. Do not suddenly put water from low-pH water into high-pH water to avoid discomfort due to a large difference in pH. Koi long-term in weakly acidic water (about pH 6.5), not only body color deterioration, but also easy to get rot. Nitrite, ammonia, and other harmful substances in the excrement of fish dissolved in water through various ways to produce nitrite, ammonia and other harmful substances. When the concentration of harmful substances is too high, the fish's activity is weakened, it floats on the surface of the water, and its body color becomes lighter, which often causes the fish to die. It is possible to install a circulating filtration system or periodically sprinkling beneficial microorganisms such as photosynthetic bacteria and Bacillus subtilis to reduce nitrite and ammonia. The water quality required by Koi Pond: A) Water must be odorless and odorless; B) Colorless, with a transparency of about 2 meters; C) No abnormal blisters; D) Normal pool moss; E) Chemical measurement of pool water: pH 6.8-7.4 Hardness 15 or less; Iron ion concentration 0.3 mg/l or less; Sulfate ion 15 mg/l or less; Chloride 19 mg/l or less; No residual chlorine; dissolved oxygen 5 mg/l or more; Ammonia 0.1 mg/l The following; nitrite 0.1 mg / liter or less; nitrate 5.5 mg / liter; does not contain hydrogen sulfide; BOD between 2.5 ~ 7; turbidity below 5 degrees; transparency in more than 100 cm. 2. Feed requirements Koi carp is omnivorous fish, generally mollusks, higher aquatic plant debris, benthic animals and even small algae or artificial grain feed can be eaten. It is best to feed artificial synthetic particles, bean cakes, cakes, bread crumbs, fish worms, clams, crab meat, cocoons and so on. Note: Summer should be fed in the morning. Feeding of bait should not be excessive. It is possible to observe whether the feeding is excessive by the feces of the koi, and if the feces becomes hard, the feeding of the bait is excessive. 3, light requirements in summer, the weather is hot and hot, must be covered with plastic shading nets to prevent direct sunlight, so that sunlight from 8000 ~ 12000 lux down to 5500 ~ 5800 lux. 4. Disease prevention Koi fish disease mainly includes water mildew, gill disease, enteritis disease, and vertical scale disease. 5, 1 Saprolegniasis (bacterium mildew, white feather disease) Symptoms: The diseased fish is parasitized with gray cotton-like hyphae. Control methods: 1) Malachite Green 0.2~0.4 mg/L soak; 2) Formalin 0.5 mg/L soak; 3) Salt 400~500 mg/L and sodium bicarbonate 400~500 mg/L Mixture The diseased fish were concentrated in a small pool. 4, 2 gizzard disease symptoms: sick fish action is slow, body color and black head. In severe cases, the silk is rotted and there is a small transparent window over the lid. Control methods: 1) bleaching powder 1 g/m 3 soaking; 2) nitrofurazone 1.5~2 g/m 3 soaking; 3) erythromycin 0.3 g/m 3 soaking. 4, 3 enteritis symptoms: body black, anal swelling, abdominal enlargement, abdominal yellow mucus spills. Control methods: 1) furazolidone 0.1 ~ 0.7 g / m 3 soaking, with oxytetracycline mixed bait; 2) Furazolidone 1 ~ 2 g / 100 kg, oral 3 days; with a small amount of garlic gargle bait fed , continuous feeding for 3 days. 4, 4 squamous disease (Squamous disease, pine scales disease) Symptoms: sick fish surface roughness, systemic scales erected as a loose ball, scaly edema at the base, the inner product of exudate. Control methods: 1) Furacillin 1g/m 3 treatment; 2) Salt 5g/l water feeding, stop for 2 days, each day with sulfadiazine 0.6g feeding bait; 3) salt 20g/L aqueous solution dipping 10 minutes; 4) erythromycin 2.0 ~ 2.5 g / m 3 soak 30 to 50 minutes.