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Feeding method for reducing nitrogen and phosphorus load of Litopenaeus Vannamei cultivation

A technology of L. vannamei and prawns, which is applied in the fields of aquaculture and marine environmental protection. It can solve the problems of reducing the survival rate of aquaculture and not knowing the discharge of nitrogen and phosphorus, so as to improve the efficiency of food conversion, reduce labor costs, and increase growth speed. Effect

Inactive Publication Date: 2008-08-27
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitrogen and phosphorus discharge of the above-mentioned shrimps during starvation and feeding is still unknown, and the principle of compensatory growth has not been applied to actual production, and the report of using periodic fasting and feeding methods to reduce nitrogen and phosphorus pollution in the breeding process
On the other hand, during the fasting period, general carnivorous animals will cause cannibalism and reduce the survival rate of breeding, so this feeding method is only designed for the docile and weak aggressive Litopenaeus vannamei

Method used

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  • Feeding method for reducing nitrogen and phosphorus load of Litopenaeus Vannamei cultivation
  • Feeding method for reducing nitrogen and phosphorus load of Litopenaeus Vannamei cultivation
  • Feeding method for reducing nitrogen and phosphorus load of Litopenaeus Vannamei cultivation

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Experimental program
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Effect test

Embodiment 1

[0029] Using juvenile Litopenaeus vannamei with a wet weight of 0.5g (dry weight 0.142g) as research materials, a starvation-feeding group (S1F3 group) was set up to be starved for 1 day and fed for 3 days, and a total of 9 cycles of 36 days were carried out. . The control group (S0 group) was fed every day. Each group set up 4 aquariums with prawns in parallel, and each box stocked with 8 tails of prawns. No feeding at all during the starvation period, and the compound feed was fed every day during the feeding period (Zhanjiang Yuehai Feed Factory, protein 43%, fat 7%, energy value 19.3kJ g -1 )3 times. The feeding time during the feeding period is 8:00, 14:00, and 19:00 every day. 1.5 hours after each feeding, the residual bait and feces were collected by siphon method, dried and weighed to determine the content of nitrogen and phosphorus. The nitrogen and phosphorus excretion rates of the prawns in each group were measured 3 times a day by running water method. During ...

Embodiment 2

[0035] With the same experimental materials as in Example 1, the starvation-feeding group (S3F9 group) was set to be starved for 3 days and fed for 9 days, and a total of 3 cycles of 36 days were carried out, and other methods were the same as in Example 1. The results of the study showed that compared with the control group (S0 group), there was no difference in the growth and body composition of the prawns (S3F9 group) treated with starvation for 3 days-feeding for 9 days, while the food conversion efficiency increased by 25.0% (see Table 2). The nitrogen load caused by shrimp defecation in the treatment group was reduced by 44.5% (see image 3 ), the phosphorus load was reduced by 46.0% (see Figure 4 ); 12.0% reduction in nitrogen load caused by shrimp excretion (see image 3 ), the phosphorus load was reduced by 9.1% (see Figure 4 ). In addition, 25% of the days in the treatment group were not fed, so there was no residual bait at all.

[0036] The growth situation ...

Embodiment 3

[0039] Using juvenile Litopenaeus vannamei with a wet weight of 0.6g as research materials, a starvation-feeding group (S2F5 group) was set up for 2 days and fed for 5 days, and a total of 6 cycles of 42 days were carried out. The control group (S0 group) was fed every day. Each group has 3 glass fiber reinforced plastic drums (bottom diameter 70cm, water volume 0.3m 3 ) in parallel with prawns, and 50 prawns are stocked in each bucket. The treatment group did not feed at all during the starvation period, and fed 3 times a day during the feeding period, and the feeding time was 8:00, 14:00, and 19:00 every day. During the experiment, 1 / 3 of the water was changed every day, and the ammonia nitrogen and phosphate in the water were measured once every 7 days, before changing the water. Each bucket is continuously inflated, the dissolved oxygen is kept above 5.0mg / L, the water temperature is 28-30°C, and the salinity is 27-29.

[0040] The results of the study showed that compa...

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Abstract

The invention discloses a feeding method of reducing nitrogen and phosphorus load of the lieopenaeus vannamei culture environment as follows: feeding and culturing the lieopenaeus vannamei in a periodic manner of a plurality of continuous periods including hungering for one day or a plurality of days, feeding for a plurality of days, hungering again for one day or a plurality of days and feeding again for a plurality of days. Compared with the prior method of day-by-day continuous feeding, the inventive feeding method can remarkably reduce nitrogen and phosphorus pollution caused by remain bait, dejecta and egesta during the culture on the basis of remaining the growth speed and the lieopenaeus vannamei nutritional ingredient, save the feed cost on account of the improved food conversion efficiency and save the labor cost because some days of the culture time are excluded from feeding time.

Description

technical field [0001] The invention relates to the field of aquaculture, and at the same time relates to the field of marine environment protection, in particular to a feeding method capable of significantly reducing nitrogen and phosphorus pollution caused to the environment during the culture process of Litopenaeus vannamei. Background technique [0002] Intensive shrimp farming aims to improve the utilization rate of land resources, greatly increase the yield per unit area and the efficiency of farming production. Due to its high stocking density, almost all the food needed for shrimp is provided by artificial feeding of compound feed. At present, in general prawn farming, the nitrogen input into the shrimp pond by artificial feeding accounts for about 90% of the total input nitrogen, of which only 19% is converted into the nitrogen in the shrimp body and finally harvested as prawn products. It enters the aquaculture environment in the form of nitrogen, accumulates in th...

Claims

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Application Information

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IPC IPC(8): A01K61/00
CPCY02A40/81
Inventor 林小涛潘剑雄许忠能孙军
Owner JINAN UNIVERSITY
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