CN106305539A - Method for spat culture of Vietnam mactra veneriformis - Google Patents

Abstract

The invention discloses a method for spat culture of Vietnam mactra veneriformis. The method comprises the following steps of (1) selecting parent shells of Vietnam mactra veneriformis with full gonads, drying in a shady area, stimulating, and inducing to lay spawns and sperms; (2) washing the spawns, and hatching; (3) culture of larva: after a zygote grows into a D type larva, setting the spat culture density to 5-8 spats per milliliter, and feeding isochrysis, wherein the feeding quantity is 30000 to 100000 isochrysis per milliliter, and 1/3 to 1.2 of water is replaced at morning and night each day; (4) after the D type larva enters the later larva phase, moving the D type larva into an outdoor water tank with bottom sand, wherein the water depth is 100cm, the water temperature is 25 to 32 DEG C, the salt content is 80 to 260%, and the sinking attaching density of larva is 10000 to 15000 larva per liter; (5) when the young shell density exceeds 120 young shells per square centimeter, loosening the spats. The method has the advantages that the spat culture density is increased, and the industrialized large-batch spat culture is realized; according to the mucus secretion habit of the Vietnam mactra veneriformis larva, the sand stone is fed into the culture tank to absorb the mucus, so as to avoid the death of Vietnam mactra veneriformis larva.

Description

A kind of Vietnam white clam method for culturing seedlings

Technical field

The present invention relates to technical field of shellfish culture, particularly relate to a kind of Vietnam white clam method for culturing seedlings.

Background technology

The white clam of Vietnam (Meretrix lyrata) also known as wrinkle rib Conch Meretricis seu Cyclinae, belongs to curtain clam mesh, Veneridae, is distributed mainly on Vietnam With regions such as China Guangxi, Taiwan.This kind delicious meat, nutritious, growth is fast, very joyous by consumer and raiser Meet, become the countries such as Vietnam, shellfish manager's breed variety in area.Its price was going up always in recent years, before cultivation Scape is a piece of good.The white clam of Vietnam belongs to wide temperature, eurysalinity shellfish, can carry out pond culture, mudflat aquaculture, shallow seabed sowing, is suitable for me Cultivation is promoted in the southern areas such as state Fujian, Zhejiang, Guangdong.

The white clam of Vietnam from parent, hasten parturition, larvae cultivation goes out pond to juvenile mollusk, through multinomial loaded down with trivial details process, owing to nursery is to water by shellfish Matter requirement is higher, technique is loaded down with trivial details, the cycle is long, is easily subject to the impact of bait, water quality, substrate, it is therefore desirable to have one conscientiously may be used The method of row, solves the nursery problem of the white clam of Vietnam.

Summary of the invention

For solving the problems referred to above present in prior art and practical situation, the invention provides the white clam nursery of a kind of Vietnam Method, comprises the following steps:

1) select the plentiful Vietnam of gonad white clam parent shellfish and carry out dry in the shade stimulation, at water temperature 28 DEG C-32 DEG C, water density 1.018-1.020, carrying out under conditions of pH value 7.6-8.2 heating up stimulates, and induces its row's essence of laying eggs, and the smart ovum of discharge is through fertilization After, form germ cell；

2) ovum and hatching are washed: use the sedimentation method to wash ovum 2-3 time, put into floor space 1 m², through hatching in the indoor pond of high 1m；

3) larvae cultivation: after development of fertilized ova to D type larva, seedling culture density is 5-8/ml, and Isochrysis galbana of throwing something and feeding is thrown something and fed Amount is 3 10 ten thousand/ml, and every day sooner or later changes water 1/3-1/2, add in water ENTA and penicillin with prevent in water metal weight from Son and the pathogenic microorganism impact on larval growth；

4), when D type larva enters later stage larval stage, D type larva moves on to put bed-sit, depth of water 100cm, water temperature 25 DEG C-32 DEG C, in the outdoor sink of salinity 8 ‰ 26 ‰, larva sinks attachment 1 1.5 ten thousand/l of density；The every 1.5m in pond²If a gas Head, sets mobile sky shade, below illumination 3200lux above pond；It is bait with Isochrysis galbana, the density of algae 13 ten thousand/ ml；After larva all adheres to, change water every day once, each quantity of exchanged water 1/2；

5) juvenile mollusk density is more than 120/cm²Shi Jinhang seedling thinning, is drained into juvenile mollusk from discharge outlet together with bed mud and uses 200 mesh sieves In the net cage that thin,tough silk is made, during after flushing, density further according to juvenile mollusk renders to put other pond of bed-sit；By 180 during water inlet Mesh sieve tulle filters, it is to avoid harmful organisms enters, and juvenile mollusk cultivation period is gently swept at the bottom of pond with bamboo broom every day, it is to avoid miscellaneous algae is attached Raw.

Preferably, in step 4), every day timing supplement nitrogen, phosphorus, silicon nutritive salt to concentration to 40 μm ol/L, 5 μm ol/L and 20μmol/L。

Present invention clam white to Vietnam parent shellfish carries out dry in the shade stimulation, promotees its row's essence of laying eggs, and methodological science is reasonable, each in nursery Stage to water Inversion phenomenon, water level, illumination, inflate, change water, cultivate density, bait feeding and prevent and kill off harmful organisms enter each Individual link has appropriate regulation, it is achieved that batch production high-volume nursery.Supplement nitrogen, phosphorus, silicon nutritive salt to concentration to 40 μm ol/L, 5 μm ol/L and 20 μm ol/L, Vietnam white clam larva grows best in such environment.

Detailed description of the invention

The invention discloses a kind of Vietnam white clam method for culturing seedlings, comprise the following steps:

1) select the plentiful Vietnam of gonad white clam parent shellfish and carry out dry in the shade stimulation, at water temperature 28 DEG C-32 DEG C, water density 1.018-1.020, carrying out under conditions of pH value 7.6-8.2 heating up stimulates, and induces its row's essence of laying eggs, and the smart ovum of discharge is through fertilization After, form germ cell；

2) ovum and hatching are washed: use the sedimentation method to wash ovum 2-3 time, put into floor space 1 m², through hatching in the indoor pond of high 1m；

3) larvae cultivation: after development of fertilized ova to D type larva, seedling culture density is 5-8/ml, and Isochrysis galbana of throwing something and feeding is thrown something and fed Amount is 3 10 ten thousand/ml, and every day sooner or later changes water 1/3-1/2, add in water ENTA and penicillin with prevent in water metal weight from Son and the pathogenic microorganism impact on larval growth；

4), when D type larva enters later stage larval stage, D type larva moves on to put bed-sit, depth of water 100cm, water temperature 25 DEG C-32 DEG C, in the outdoor sink of salinity 8 ‰ 26 ‰, larva sinks attachment 1 1.5 ten thousand/l of density；The every 1.5m in pond²If a gas Head, sets mobile sky shade, below illumination 3200lux above pond；It is bait with Isochrysis galbana, the density of algae 13 ten thousand/ ml；After larva all adheres to, change water every day once, each quantity of exchanged water 1/2；

5) juvenile mollusk density is more than 120/cm²Shi Jinhang seedling thinning, is drained into juvenile mollusk from discharge outlet together with bed mud and uses 200 mesh sieves In the net cage that thin,tough silk is made, during after flushing, density further according to juvenile mollusk renders to put other pond of bed-sit；By 180 during water inlet Mesh sieve tulle filters, it is to avoid harmful organisms enters, and juvenile mollusk cultivation period is gently swept at the bottom of pond with bamboo broom every day, it is to avoid miscellaneous algae is attached Raw.

In step 4), every day, timing supplemented nitrogen, phosphorus, silicon nutritive salt to concentration to 40 μm ol/L, 5 μm ol/L and 20 μm ol/ L。

The nursery growth selection phase of the present invention is 2-3 age, 3.0 cm≤shell length≤4.0cm, coefficient of condition >=30% of gonad The white clam of Vietnam, this kind of method is greatly improved cultivation density, and the growth of clam Seedling is fast, improves the efficiency of nursery, reduces the white clam of Vietnam The mortality rate of seedling.

Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention, Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent. All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's Within protection domain.

Claims (2)

1. Vietnam's white clam method for culturing seedlings, it is characterised in that comprise the following steps:

1) select the plentiful Vietnam of gonad white clam parent shellfish and carry out dry in the shade stimulation, at water temperature 28 DEG C-32 DEG C, water density 1.018-1.020, carrying out under conditions of pH value 7.6-8.2 heating up stimulates, and induces its row's essence of laying eggs, and the smart ovum of discharge is through fertilization After, form germ cell；

2) ovum and hatching are washed: use the sedimentation method to wash ovum 2-3 time, put into floor space 1 m², through hatching in the indoor pond of high 1m；

3) larvae cultivation: after development of fertilized ova to D type larva, seedling culture density is 5-8/ml, and Isochrysis galbana of throwing something and feeding is thrown something and fed Amount is 3 10 ten thousand/ml, and every day sooner or later changes water 1/3-1/2, add in water ENTA and penicillin with prevent in water metal weight from Son and the pathogenic microorganism impact on larval growth；

4), when D type larva enters later stage larval stage, D type larva moves on to put bed-sit, depth of water 100cm, water temperature 25 DEG C-32 DEG C, in the outdoor sink of salinity 8 ‰ 26 ‰, larva sinks attachment 1 1.5 ten thousand/l of density；The every 1.5m in pond²If a gas Head, sets mobile sky shade, below illumination 3200lux above pond；It is bait with Isochrysis galbana, the density of algae 13 ten thousand/ ml；After larva all adheres to, change water every day once, each quantity of exchanged water 1/2；

5) juvenile mollusk density is more than 120/cm²Shi Jinhang seedling thinning, is drained into juvenile mollusk from discharge outlet together with bed mud and uses 200 mesh sieves In the net cage that thin,tough silk is made, during after flushing, density further according to juvenile mollusk renders to put other pond of bed-sit；By 180 during water inlet Mesh sieve tulle filters, it is to avoid harmful organisms enters, and juvenile mollusk cultivation period is gently swept at the bottom of pond with bamboo broom every day, it is to avoid miscellaneous algae is attached Raw.

Vietnam the most according to claim 1 white clam method for culturing seedlings, it is characterised in that in step 4), the supplementary nitrogen of timing every day, Phosphorus, silicon nutritive salt to concentration are to 40 μm ol/L, 5 μm ol/L and 20 μm ol/L.