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A method for preventing sudden changes in water quality in the process of raising crab seedlings in earthen ponds

A technology for river crabs and earth ponds, applied in chemical instruments and methods, neutralizing water/sewage treatment, climate change adaptation, etc., can solve problems such as low cost and sudden change in water quality, achieve low cost, prevent sudden change in water quality, and reduce pH adjustment. effect of times

Active Publication Date: 2021-06-04
PANJIN GUANGHE CRAB IND
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of water quality mutation caused by supersaturated deposition of calcium carbonate in the earthen pond of river crab in the prior art, the present invention provides a method for preventing water quality mutation in the process of raising crab earthen pond seedlings, which can effectively prevent water quality mutation during the earthen pond cultivation of river crab happen, low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In 2015, river crab ecological breeding was carried out in the delta area of ​​Panjin City, Liaoning Province. The implementation steps are as follows:

[0041] A. At the end of April, the pH of river crab nursery ponds was measured 3 days after bleaching powder disinfection. There were 20 ponds with pH values ​​in the range of 8.7 to 8.9. Sprinkle barreled industrial hydrochloric acid (mass concentration 31%) in the ponds, and the consumption was 20 liters per mu , When splashing, mix hydrochloric acid and water at a ratio of 1:3, splash the whole pool, measure the pH the next day, and it is in the range of 8.5 to 8.6.

[0042] B. At the beginning of May, put Artemia eggs in the nursery pond after the crabs are larvae, at a density of 20 grams per mu.

[0043] C, the whole nursery stage monitors the pH value of seedling ponds at noon every day. In the stage II of the zoan larvae of river crabs, the amount of phytoplankton in 8 seedling ponds is relatively large, and the ...

Embodiment 2

[0045] In 2015, river crab ecological breeding was carried out in the coastline area of ​​Panjin City, Liaoning Province. The implementation steps are as follows:

[0046] A. At the end of April, the river crab nursery ponds were measured for pH 3 days after bleaching powder disinfection. There were 15 ponds with pH values ​​in the range of 8.7-8.9. Sprinkle barreled industrial hydrochloric acid (mass concentration 36%) in the ponds, and the consumption was 20 liters per mu , When splashing, mix hydrochloric acid and water at a ratio of 1:3, splash the whole pool, measure the pH the next day, and it is in the range of 8.5 to 8.6.

[0047] B. At the beginning of May, put Artemia eggs in the nursery pond after the crabs are larvae, at a density of 20 grams per mu.

[0048] C, the whole nursery stage monitors the seedling pond pH value at noon every day, and at the stage V of the zoan larvae of river crab, the pH of 5 seedling ponds reaches more than 9.1. At this time, use barrel...

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Abstract

The invention relates to the technical field of river crab cultivation, and provides a method for preventing water quality mutations in the process of raising river crab seedlings in an earthen pond. Before raising river crab seedlings, the pH value of the water body in the river crab seedling pond is adjusted to below 8.6 with hydrochloric acid solution; Artemia eggs were inoculated in the pool, and crab seedlings were started; during the crab seedling period, the pH value of the water in the crab nursery pool was monitored, and when the pH value reached above 9.1, the pH value of the water body was adjusted to 8.5-8.9 with hydrochloric acid solution. In the method of the present invention, after the Artemia eggs are inoculated, the hatched Artemia will eat the phytoplankton in the river crab nursery pond, thereby delaying the rapid rise of the pH value of the water body caused by photosynthesis; using hydrochloric acid to adjust the pH value of the water body, the The effect of lowering the pH value is clear, fast and stable. The present invention combines the two, that is, the purpose of effectively reducing the pH value can be achieved without causing damage to young crabs.

Description

technical field [0001] The invention relates to the technical field of river crab cultivation, in particular to a method for preventing sudden changes in water quality in the process of raising river crab seedlings in earthen ponds. Background technique [0002] Chinese mitten crab (Eriocheirsinensis), also known as river crab, is an important characteristic aquatic economic species in my country. In recent years, ecological seedling breeding in earthen ponds has become the main way of breeding river crab seedlings. However, in recent years, a large number of crab seedlings have died every year in Panjin and Yingkou, the areas where crab seedlings are concentrated in Liaoning. This phenomenon also occurs in large numbers in river crab nursery farms near Shanghai in southern China. Ponds where a large number of crab seedlings die generally have darker colors. The dark green pool water quickly turned whitish and turbid, and yellow-white sediments were visible on the bottom of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14A01K61/59
CPCA01K61/59C02F1/66C02F3/32Y02A40/81
Inventor 孙娜雷衍之李晓东刘胥
Owner PANJIN GUANGHE CRAB IND
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