A kind of method for cultivating large barb fry
A method for cultivating chinensis and a technology for chinensis are applied in the field of artificial cultivation of chinensis fry, which can solve the problems of low survival rate and insufficient cultivating technology of chinensis fry, etc., so as to improve the survival rate of seedlings, improve the survival rate of larvae, and improve the survival rate of larvae. The survival rate of the pond, the effect of improving the survival rate and the survival rate of the lower pond
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Embodiment 1
[0019] Example 1: Effects of different opening baits on the growth of 7-day-old giant barb larvae
[0020] Prepare 12 flat tanks, the water temperature in the tank is 25±1°C, the pH is 6.5-7.5, and the ammonia nitrogen is less than 0.01 mg L -1 , water exchange volume 2 L min -1 , the dissolved oxygen is greater than 6 mg L -1 . Pour the filmed giant barb fry (including part of the fish embryos that have not been filmed) on the mesh in the plane tank, and put 50,000 fish in each tank. Four bait treatment groups were set up, namely soybean milk group, egg yolk group, rotifer group cultivated by chlorella, and egg yolk+rotifer group. There are 3 parallels for each open bait group, and each parallel is a random plane groove. The experimental period is 7 days, and the feeding starts from the 4th day, and is fed once a day at 6:00, 10:00, 14:00, and 18:00 for 3 days, and the test fish in the egg yolk + rotifer group Feed egg yolks only. Change the water once a day, and change...
Embodiment 2
[0024] Embodiment 2: Effects of different opening baits on the growth of 14-day-old giant barb larvae
[0025] Prepare 12 circular tanks, the water temperature in the tank is 25±1°C, the pH is 6.5-7.5, and the ammonia nitrogen is less than 0.01 mg L -1 , water exchange capacity 2L min -1 , the dissolved oxygen is greater than 6 mg L -1 . The giant barb larvae cultivated in the plane tank for 7 days were transferred into the round tank, and each plane tank was randomly corresponding to a round tank. The experimental period was 7 days, the bait of other experimental groups was unchanged, and the larvae of egg yolk+rotifer group were fed with rotifers instead. Change the water once a day, clean up dead experimental fish in time, and remove feces and residual bait. After the experiment, the survival rate was calculated, and 100 test fish were randomly selected from each circular tank to measure the total length and body weight. The experimental results are as follows:
[002...
Embodiment 3
[0030] Embodiment 3: Determination of growth status of 3-month-old giant barb fish
[0031] The 4 experimental fishes of the bait treatment group that had been cultivated indoors for 14 days and the 3-5 day-old giant barb larvae that had just emerged from the membrane and had not been cultivated indoors were transferred to outdoor earthen ponds for cultivation. When going down to the pond, put them in at a density of 100,000 tails per mu, and set up 3 parallel earthen ponds for each treatment group, with a total of 15 earthen ponds, and control the water environment conditions of the ponds to be the same. After 3 months, 100 fish were randomly sampled from each pond, and the growth indicators were measured: the average body weight of large barb in the egg yolk + rotifer group was 27.13 g, the total length was 16.95 cm, and the survival rate of seedlings was 89.4%, which was significantly higher than other test groups.
[0032] Table 3 Growth status of 3-month-old giant barb ...
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