Detailed management to improve the efficiency of fish culture

The two-year downturn has had a big impact on raw fish farmers. The author visited the first line to understand that the culture cost of fish produced before last year was about 4.8-5.5 yuan / jin, while during this period, when there were more big fish in raw fish ponds, the price was only about 6 yuan / jin. For some farmers whose breeding level is not high, there is no profit or even loss. Therefore, this year, many raw fish farmers have switched to California perch, Pelteobagrus fulvidraco and so on. The industry estimates that raw fish culture in Shunde will decrease by nearly 30% this year.

The sluggish industry makes raw fish farming unprofitable? This is not the case. Even in the case of low fish prices last year, some farmers still achieved better economic benefits. Ashun, a farmer in Guanghua Village, Xingtan Town, Shunde, is one of them.

Pond area: 12 mu; water depth 2.0-2.8 m; culture time: 2010-5-10-20-20-20-12: 28.

The results showed that there were 80, 000 Korean fish (black sesame 250000 was bred in this specification and then went to the pond on April 24), and there were about 5000 poor seedlings, 2000 big head (6-7cm/) and 5000 crucian carp (7-Korean fry).

Harvest: raw fish 145000 jin, about 1.8 jin / tail, head fish 3.5jin / tail; big head 3300 jin (> 1 jin / tail); no crucian carp (eaten by raw fish).

Investment: pond rent, electricity, medicine, fish fry, fish paste, feed (the whole process uses "Qunfeng" brand expanded raw fish), a total of 699500.

Income: the price of raw fish is 6.1yuan / jin, and the big head is 3.3yuan / jin, totaling 895390 yuan.

Economic benefit: 195890 yuan, about 16325 yuan / mu.

Feed coefficient 4000 × 40) / 145 000 × 1.1.

The survival rate is 145000 pounds 1.8) / 85000 pounds 94.7%.

Daily management and matters needing attention in raw fish culture

Daily management of aquaculture density in ponds, daily feeding time, frequency and amount of feeding, precautions for disease prevention

Black sesame → 7 facing the seedling pond noodles: all sizes, mostly 5-10 mu water level: at the beginning, the water depth is about 1m, slowly increase to 1.6m-1.8m, in the later stage, it can reach 2.2m-2.5m raw fish fry more than 12) 10000-12000 / mu big head (silver carp): 40-60 / mu, it is recommended that more than 3 taels of crucian carp: 150200 / mu It is suggested that more than two herring and silver carp: put 10-20 herring and silver carp each: too much miscellaneous fish will affect the feed coefficient, fertilize and cultivate water before fry go into the pond, reproduce plankton, and sufficient bait can avoid killing each other. Zooplankton (water spider) dead water spider + fish pulp 5-6 days 2-3 days about 5 meals a week, a small number of times, according to the fish fry specifications to adjust the bait should be sufficient, every 3 days or so with fish sieve classification culture, to avoid killing each other, improve the survival rate; small size can be fed 1-2 meals to promote its growth. Mainly killing insects, especially rotifers, especially rotifers

8-9g water injection by stages is beneficial to improve the survival rate, usually once in 5-7 days, about 10cm each time. No. 0 material + fish paste 5-7 days 5 meals shall be eaten in one hour

Attention should be paid to gastrointestinal diseases when feeding chilled fish paste with 9-12g No. 1 feed + fish paste for 8-10 days.

5-10g No.2 material + fish paste for about 15 days. It is recommended to use fish paste until it is more than 3 taels on average. It is best to feed 7-8 full, eat less and eat more.

10-25g No. 3 + fish paste 15-18 days 2 meals to eat half an hour to enter the high temperature season to prevent bacterial hemorrhagic disease

The nitrite is high in the later stage of 50-150g, so it is recommended to turn on the aerator at noon. When the nitrite is on the high side, it is recommended to transfer water or change water No. 4 + fish paste for about 20 days.

Feed 150g-250g No. 5 for two meals above 23 ℃ in 20-30 days. When the water temperature is low (below 15 ℃), you must control the feeding amount and feed only when there is sun. Pay attention to liver diseases (such as hepatomegaly, discoloration, etc.)

Feed 2 meals for more than 250g and no. 6 to 23 ℃ of fish, whichever is finished in 15-20 minutes

15-22 ℃ feeding 1 meal

Feed 1 meal under 15 ℃ for 5-7 days