CN103250660A

CN103250660A - Method for breeding red green crabs in pond

Info

Publication number: CN103250660A
Application number: CN2013101400740A
Authority: CN
Inventors: 顾根生; 蔡春芳; 沈建明; 张震龙; 王国清; 张倩; 宋霖; 龚志; 吴韬; 张伟; 张伟业
Original assignee: Suzhou Yangcheng Lake National Modern Agriculture Demonstration Area Developing Co Ltd; Suzhou University
Current assignee: Suzhou Yangcheng Lake National Modern Agriculture Demonstration Area Developing Co Ltd; Suzhou University
Priority date: 2013-04-22
Filing date: 2013-04-22
Publication date: 2013-08-21
Anticipated expiration: 2033-04-22
Also published as: CN103250660B

Abstract

The invention discloses a method for breeding red green crabs in a pond. On-line monitoring of pond water dissolved oxygen amount is started in 30-60 days before the red green crabs come into the market, a critical value is set, and when the pond water dissolved oxygen amount is lower than the critical value, an aerator is started to ensure that the pond water resolved oxygen amount is higher than the critical value. The critical value is 3.5mg/L to 4.5mg/L. Food containing astaxanthin is fed to the red green crabs in 30-60 days before the red green crabs come into the market, and each crab is made to intake more than 11.5g of astaxanthin. By means of the method, sufficient dissolved oxygen in the crab pond can be guaranteed, negative effects on astaxanthin deposition from changes of environmental factors are weakened, the organoleptic quality and the taste of the crabs in ponds can be improved, and therefore economical benefits of breeding crabs in the pond are increased. The method is simple in operation, easy to implement and low in cost.

Description

The cultural method of the red cream crab in a kind of pond

Technical field

The invention belongs to technical field of aquaculture, be specifically related to the cultural method of the red cream crab in a kind of pond.

Background technology

River crab, the formal name used at school Eriocheir sinensia is the traditional fresh water aquatic products good merchantable brand of China, in recent years along with the improving constantly of living standards of the people, to river crab, the particularly continuous expansion of the consumption demand of red cream crab, culture of Chinese mitten crab output is above 59.3 ten thousand tons at present.

The lake depth of water is suitable, the pasture and water riotous growth, natural conditions are superior, be always river crab good fatten place and breeding spot, to enclose area excessive but owing to lack planning and the many lakes of control measures net, seriously cause resource to fall sharply to lake resource destruction, add artificially extremely to catch excessively and drag for, influenced the lake culture environment.For the needs of sustainable development and lake ecological improvement, the lake purse seine is supported the crab area and is just constantly reduced.At present, the river crab of pond culture can compare favourably with the river crab of lake culture aspect specification, the output, and is that have even bigger than the river crab specification of lake culture in enclosure, output is high.

But because the restriction of pond ecotope, the red cream crab that imitative natural, ecological technology is cultured still is inferior to the red cream crab of lake culture in enclosure aspect organoleptic quality, red cream crab cream (hepatopancrease) color that mainly shows pond culture is bright-coloured inadequately, it is also dim relatively to boil back crab shell color, and it is so red to be not so good as the lake river crab; The mouthfeel aspect is also so bright, sweet not as the red cream crab of lake culture, and the red cream crab market price determines that by its quality and specification simultaneously, along with growth in the living standard, people are increasing to the demand of high-quality red cream crab.

Therefore to support the industry development of crab necessary to improving the pond with effective organoleptic quality of improving the red cream crab of pond culture to seek a kind of new cultural method.

Summary of the invention

The cultural method that the purpose of this invention is to provide the red cream crab in a kind of pond to improve the quality of the red cream crab of pond culture, improves culture benefit.

To achieve the above object of the invention, the technical solution used in the present invention is:

The cultural method of the red cream crab in a kind of pond in preceding 30～60 days of red cream crab listing, begins on-line monitoring pond water-soluble oxygen amount, sets a critical value, starts aerator when pond water-soluble oxygen amount is lower than this critical value, guarantees that pond water-soluble oxygen amount is at this more than critical value; Described critical value is 3.5mg/L～4.5mg/L;

In preceding 30～60 days of red cream crab listing, begin to feed and contain the food of astaxanthin, make every to become crab to take in more than astaxanthin 11.5 grams.

In the technique scheme, described critical value is preferably 4.0mg/L.

In the technique scheme, described astaxanthin derives from spiral shell, the freshwater mussel after spirulina, haematococcus pluvialis or astaxanthin are strengthened; The method that described astaxanthin is strengthened spiral shell and freshwater mussel is it to be supported be rich in the water body of little algae more than 4 days; This water body that is rich in little algae is haematococcus pluvialis algae liquid, spirulina algae liquid or the breed tail water of having inoculated photosynthetic bacteria, useful little algae.

Operation principle of the present invention is: under the pond condition, because the plantation of a large amount of pasture and water, river crab growing environment amplitude of variation is very big, dissolved oxygen 2 left and right sides Ke Da 18mg/L in the afternoon for example, and dissolved oxygen has only 2mg/L during 8 left and right sides in the morning.This violent variation round the clock of envirment factor makes river crab be in stress situation, produces a large amount of free radicals, and metabolism has a significant impact to taste compound in the existence of a large amount of free radicals.In addition, carotenoid is as a kind of antioxidant, can be used to remove free radical and consumes, and river crab can not self synthetic class carrot, relies on to obtain from food, and carotenoid is rich owes to have a strong impact on river crab hepatopancrease and body colour.If but supplemented with exogenous carotenoid and do not eliminate the influence of envirment factor only, the hyperchromic effect of supplemented with exogenous carotenoid will be not obvious or unstable.By determining the dose-effect relationship between dissolved oxygen and the hyperchromic effect of carotenoid, drop into outer source carotenoid simultaneously, improve dissolved oxygen, can reduce and lose flavor substance, thereby to river crab liver pancreas and body colour and local flavor generation positive impact, produce so-called red cream crab.

Because technique scheme is used, the present invention compared with prior art has following advantage:

1. cultural method of the present invention can keep the dissolved oxygen of crab pond abundance, slackened the variation of envirment factor to the negative effect of carotenoid deposition, improved the color of river crab liver pancreas, sexual gland and crust, improve organoleptic quality, the taste flavor of river crab, thereby improved the economic benefit that crab is supported in the pond.

2. cultural method of the present invention is simple to operate, and is easy to implement, and cost is lower.

Embodiment

Be further described below in conjunction with the present invention of embodiment:

Embodiment one

The cultural method of the red cream crab in a kind of pond, on-line monitoring pond dissolved oxygen was passed through in preceding 30 days in listing in the river crab pond under the normal condition, opened oxygen increasing pump when dissolved oxygen is lower than 4mg/L.Throwing something and feeding in transparency is the spiral shell of strengthening in the spirulina liquid of 15cm 4 days, and the spiral shell feeding volume decide on contained carotenoid in its body, but needs to guarantee that every river crab takes in 11.5 and restrain above astaxanthin.This section in the period other feedstuff feeding amount suitably reduce.Through 30 days raising, river crab organoleptic quality and Yangcheng Lake high-quality river crab did not have significant difference during listing.

Embodiment two

The cultural method of the red cream crab in a kind of pond was passed through on-line monitoring pond dissolved oxygen in preceding 60 days in listing, opened oxygen increasing pump when dissolved oxygen is lower than 3.5mg/L.The reinforcement spiral shell of throwing something and feeding; Addition is taken in the above astaxanthin of 11.5 grams and is as the criterion to guarantee each river crab.This section in the period other feedstuff feeding amount suitably reduce.Through 60 days raising, river crab organoleptic quality and Yangcheng Lake high-quality river crab did not have significant difference during listing.

The intensifying method of spiral shell is: inoculation haematococcus pluvialis and photosynthetic bacteria in culturing tail water, the inoculum concentration first day is 1L/667m ³Water body; Reseed according to transparency and water colour later on, make transparency below 30cm; Spiral shell strengthen 7 after fish for use.

Embodiment three

The cultural method of the red cream crab in a kind of pond was passed through on-line monitoring pond dissolved oxygen in preceding 45 days in listing, opened oxygen increasing pump when dissolved oxygen is lower than 4.5mg/L.The high-quality mixed feed of throwing something and feeding and containing 3% spirulina; Addition is taken in the above astaxanthin of 11.5 grams and is as the criterion to guarantee each river crab.Through 45 days raising, river crab organoleptic quality and Yangcheng Lake high-quality river crab did not have significant difference during listing.

Embodiment four

The cultural method of the red cream crab in a kind of pond was passed through on-line monitoring pond dissolved oxygen in preceding 30 days in listing, opened oxygen increasing pump when dissolved oxygen is lower than 4.0mg/L.The high-quality mixed feed of throwing something and feeding and containing 0.6% haematococcus pluvialis; Addition is taken in the above astaxanthin of 11.5 grams and is as the criterion to guarantee each river crab.Through 30 days raising, river crab organoleptic quality and Yangcheng Lake high-quality river crab did not have significant difference during listing.

Claims

1. the cultural method of the red cream crab in pond is characterized in that:

In preceding 30～60 days of red cream crab listing, beginning on-line monitoring pond water-soluble oxygen amount is set a critical value, starts aerator when pond water-soluble oxygen amount is lower than this critical value, makes pond water-soluble oxygen amount remain on this more than critical value; Described critical value is selected from 3.5mg/L～4.5mg/L;

2. cultural method according to claim 1, it is characterized in that: described critical value is 4.0mg/L.

3. cultural method according to claim 1 is characterized in that: described astaxanthin derives from spiral shell, the freshwater mussel after spirulina, haematococcus pluvialis or astaxanthin are strengthened.

4. cultural method according to claim 3 is characterized in that: the method that described astaxanthin is strengthened spiral shell, freshwater mussel is spiral shell, freshwater mussel to be supported be rich in the water body of little algae more than 4 days.

5. cultural method according to claim 4 is characterized in that: the described water body that is rich in little algae is haematococcus pluvialis algae liquid, spirulina algae liquid or the breed tail water of having inoculated photosynthetic bacteria, useful little algae.