CN109006588A - The method for helping advanced fry of yellow catfish to effectively improve survival rate quickly through sensitive periods - Google Patents

Abstract

The invention discloses a kind of methods that help advanced fry of yellow catfish effectively improves survival rate quickly through sensitive periods, belong to aquaculture field.This aquaculture management method is: 1. pond prepares and Conyza canadensis is launched；2. fry pond-inputting and tame and docile food；3. pond ecological is maintained to stablize.The present invention has following advantages and good effect: 1. attracting fry to float on water body surface layer using the sufficient bait in the Conyza canadensis grass bundle region of water body surface layer and ingests, help fry quickly through sensitive periods, effectively improve survival rate of fish fry；2. effectively evading fry feeding habits converts pond bottom food organisms bring pest and disease risk of ingesting；3. improving fry immunity, resistance of the enhancing fry to disease；4. operating method is simple and clear, material is easily obtained, and has the prospect easily promoted that can demonstrate；5. being a kind of environmentally friendly technological development, there is good safety records, without potential environmental risk.

Description

The method for helping advanced fry of yellow catfish to effectively improve survival rate quickly through sensitive periods

Technical field

The present invention relates to aquaculture technologies more particularly to a kind of help advanced fry of yellow catfish effectively to mention quickly through sensitive periods The method of high-survival rate.

Background technique

Pelteobagrus fulvidraco be under the jurisdiction of siluriformes (Silurformes), Chang section (Bagride), Pelteobagrus (Pelteobagrus), It is peculiar for East Asia, it is that bottom common in China's rivers and lakes is dwelt predacious fish.Its fine and tender taste, delicious flavour and without between flesh Thorn firmly gets the favor of consumer, has been developed into the higher famous-brand and high-quality freshwater aquiculture kind of economic value in recent years.However, yellow at present During forehead fish artificial breeding, the fry death rate is high, and seed breeding factory is to increase number of eggs laid to improve parent's quantity, Overcome the problems, such as high mortality, this not only adds the labor intensity of breeding worker, waste incubation equipment, increase simultaneously The spending for breeding cost becomes the bottleneck for restricting the development of Pelteobagrus fulvidraco aquaculture industryization at this stage.

Fry early development stage is period most sensitive to external environment in the entire life process of fish, this " sensitive Phase " has generality.Wherein, fry feeding habits transformation and habitat in fry food supply be the key that determine its can survive.It is yellow Forehead fish sensitive periods, has feeding habits transformation twice to switch to zoobenthos by zooplankter for the first time in emergence 9~13 days；Exist for the second time Emergence 18~22 days, the Omnivora based on animal bait is switched to by zoobenthos.This stage advanced fry of yellow catfish habitat and food Sex reversal is violent, causes its death rate high, and pond bottom food organisms source is unreliable, unstable, even more exacerbates fish The pest and disease risk of seedling sensitive periods.

Conyza canadensis be under the jurisdiction of chrysanthemum mesh (Asterales), composite family (Asteraceae), Conyza (Conyza), originate in north America, the present each provinces and regions in China north and south are distributed, and are born on soil dry, on the sunny side, in roadside, field and pond side shape more At large stretch of thick grass, 70~130 centimetres of stem length before blooming have the advantages that growth is rapid, easily obtains and conveniently ties up.In addition, small Contain the β~cedrene with anti-inflammatory activity effect and antibiotic effective ingredient vanillic acid and syringic acid in fluffy grass plant extracts, It is a kind of natural plants antibacterial agent.

Summary of the invention

The object of the invention is that overcoming shortcoming and defect of the existing technology, a kind of help advanced fry of yellow catfish is provided The method for effectively improving survival rate quickly through sensitive periods.

The object of the present invention is achieved like this:

Start with from advanced fry of yellow catfish sensitive periods aquaculture management, is attracted using the sufficient bait in the Conyza canadensis grass bundle region of water body surface layer Fry floats on water body surface layer and ingests, and looks for food consumption at this point, taming and dociling the food dedicated powder of Pelteobagrus fulvidraco and can reduce fry, avoids fry downlink and eat Sex reversal helps fry quickly through sensitive periods, effectively improves survival rate of fish fry；Meanwhile effectively evading the conversion of fry feeding habits and taking the photograph Eat pond bottom food organisms bring pest and disease risk；In addition, the effective component that Conyza canadensis is discharged as natural plants antibacterial agent, Fry immunity, resistance of the enhancing fry to disease can be improved.

Specifically, this method the following steps are included:

1. pond prepares and Conyza canadensis is launched:

A, selection is had abundant water resources, water quality is good, pollution-free and into convenient pond is drained, and prepares pond, fertilizing water quality in advance；

B, pond is thrown before seedling 1~2 day, the Conyza canadensis on pond side is cut down, and be bundled into the grass bundle of 1~3kg/ handle；

2. fry pond-inputting and tame and docile food:

A, after the flat trip of advanced fry of yellow catfish membrane, timely pond-inputting supplements grass bundle as needed；

B, stablize after fry pond-inputting 3~5 days, be gathered in Conyza canadensis grass bundle region, start to tame and docile the dedicated powder of ichthyophagy seedling Pelteobagrus fulvidraco, And gradually food dedicated No. 0 expanded pellet feed of Pelteobagrus fulvidraco is tamed and dociled in transition；

Dedicated No. 0 expanded pellet feed of the Pelteobagrus fulvidraco is a kind of well known feed, can be obtained from commercial channel；

3. pond ecological is maintained to stablize:

I, after taming and dociling and eat successfully, grass bundle in the timely cleaning pool avoids grass bundle stack retting from ruining water quality；

II carries out disinfection, bait throwing in and moisturizing work according to the actual situation.

Working mechanism:

Well-grown Conyza canadensis is cut down, and is bundled into grass bundle and uniformly launches on pond surface, combines in algae and Enrichment by Microorganisms Under grass bundle, sufficient food is provided for zooplankter, while zooplankter being promoted largely to be gathered in grass bundle；Since Pelteobagrus fulvidraco has There is the habit for liking to inhabit in water plant area, sufficient bait attracts in addition, and Pelteobagrus fulvidraco seedling floats on water body surface layer grass whithin a period of time In region, looks for food consumption at this point, taming and dociling the food dedicated powder of Pelteobagrus fulvidraco and can reduce fry, makes its manually reliable feed of ingesting early, Avoid the transformation of fry downlink feeding habits, helps fry quickly through sensitive periods, effectively improve survival rate of fish fry；Meanwhile effectively evading Because pond bottom food organisms source it is unreliable and unstable caused by pest and disease risk；In addition, Conyza canadensis is anti-as natural plants Fry immunity, resistance of the enhancing fry to disease can be improved in the effective component of microbial inoculum release.

The present invention has following advantages and good effect:

1. attracting fry to float on water body surface layer using the sufficient bait in the Conyza canadensis grass bundle region of water body surface layer to ingest, at this point, taming and dociling The food dedicated powder of Pelteobagrus fulvidraco can reduce fry and look for food consumption, avoid the transformation of fry downlink feeding habits, help fry is quickly through sensitivity Phase effectively improves survival rate of fish fry；

2. effectively evading fry feeding habits converts pond bottom food organisms bring pest and disease risk of ingesting；

3. fry immunity can be improved in the effective component that Conyza canadensis is discharged as natural plants antibacterial agent, enhance fry to disease The resistance of disease；

4. operating method is simple and clear, material is easily obtained, and has the prospect easily promoted that can demonstrate；

5. being a kind of environmentally friendly technological development, there is good safety records, without potential environmental risk.

Specific embodiment

It is described in detail below with reference to embodiment:

One, embodiment

1, embodiment 1

On May 15th, 2016 selects 3.8 mu of advanced fry of yellow catfish culture ponds, dry method of guicklime in the Jiangsu Huaian Huaiyin District township Ling Qiao It cleans up the pond；After cleaning up the pond 7 days, the muck hair pool that application fermentation disinfects is then injected into 80 mesh silk cover filtering water, reaches depth of water 45cm；After a week, the Conyza canadensis on pond side is cut down, is bundled into the grass bundle of 2kg/ handle, grass bundle uniformly launched on pond surface, thrown It is high-volume 15 handle/mus；It is put into 1,000,000 tail of fry after flat trip on June 2nd, 2016；After fry enters the pool, grass bundle is supplemented as needed About 5；It after fry stablizes 3 days, is gathered in Conyza canadensis grass bundle region, starts to tame and docile the dedicated powder of ichthyophagy seedling Pelteobagrus fulvidraco, and gradually Food dedicated No. 0 expanded pellet diet of Pelteobagrus fulvidraco is tamed and dociled in transition；It tames and dociles after eating successfully, clears up grass bundle in the pool in time；During fry rearing, under water level New water is replenished in time when drop, water inlet principle is multiple on a small quantity；On June 27th, 2016, fry body length reach 3cm or more, this time-division pool Raising；It is 86.12 ten thousand tails that seine, which takes exercise and counts cun piece Pelteobagrus fulvidraco, and survival rate reaches 86.12%.

2, embodiment 2

On May 23rd, 2016 selects 5.2 mu of advanced fry of yellow catfish culture ponds, dry method of guicklime in the Jiangsu Huaian Huaiyin District township Ling Qiao It cleans up the pond；After cleaning up the pond 7 days, the muck hair pool that application fermentation disinfects is then injected into 80 mesh silk cover filtering water, reaches depth of water 50cm；After a week, the Conyza canadensis on pond side is cut down, is bundled into the grass bundle of 2.5kg/ handle, grass bundle uniformly launched on pond surface, Injected volume is 13 handle/mus；It is put into 1,000,000 tail of fry after flat trip on June 9th, 2016；After fry enters the pool, supplement is careless as needed About 10；It after fry stablizes 5 days, is gathered in Conyza canadensis grass bundle region, starts to tame and docile the dedicated powder of ichthyophagy seedling Pelteobagrus fulvidraco, hereafter Gradually food dedicated No. 0 expanded pellet diet of Pelteobagrus fulvidraco is tamed and dociled in transition；It tames and dociles after eating successfully, clears up grass bundle in the pool in time；During fry rearing, water New water is replenished in time when the decline of position, water inlet principle is multiple on a small quantity；On July 8th, 2016, fry body length reach 3cm or more, this time-division Pool raising；It is 88.57 ten thousand tails that seine, which takes exercise and counts cun piece Pelteobagrus fulvidraco, and survival rate reaches 88.57%.

3, embodiment 3

On May 18th, 2017 selects 4.5 mu of advanced fry of yellow catfish culture ponds, dry method of guicklime in the Jiangsu Huaian Huaiyin District township Ling Qiao It cleans up the pond；After cleaning up the pond 7 days, the pool is sent out using certain producer's rich water product, 80 mesh silk cover filtering water is then injected into, reaches depth of water 50cm；After a week, the Conyza canadensis on pond side is cut down, is bundled into the grass bundle of 3kg/ handle, grass bundle uniformly launched on pond surface, thrown It is high-volume 10 handle/mus；It is put into 1,200,000 tail of fry after flat trip on June 5th, 2017；After fry enters the pool, grass bundle is supplemented as needed About 8；After fry stablizes 3 days, start to tame and docile the dedicated powder of ichthyophagy seedling Pelteobagrus fulvidraco, hereafter gradually food Pelteobagrus fulvidraco dedicated No. 0 is tamed and dociled in transition Expanded pellet diet；It tames and dociles after eating successfully, clears up grass bundle in the pool in time；During fry rearing, new water is replenished in time in when water level decreasing, is intake Principle is multiple on a small quantity；On July 1st, 2017, fry body length reach 3cm or more, the raising of this time-division pool；Seine, which is taken exercise, counts a cun piece Huang Forehead fish is 106.85 ten thousand tails, and survival rate reaches 89.04%.

Two, interpretation of result

Examples 1 to 3 cultivating condition and advanced fry of yellow catfish cultivate effect are summarized:

The present invention enters according to the life habit and environmental demand in advanced fry of yellow catfish stage from advanced fry of yellow catfish sensitive periods aquaculture management Hand attracts fry to float on water body surface layer and ingests using the sufficient bait in the Conyza canadensis grass bundle region of water body surface layer, at this point, it is yellow to tame and docile food The dedicated powder of forehead fish can reduce fry and look for food consumption, avoid the transformation of fry downlink feeding habits, help fry quickly through sensitive periods, have Effect improves survival rate of fish fry；Meanwhile effectively evading fry feeding habits and converting pond bottom food organisms bring pest and disease risk of ingesting； In addition, the effective component that Conyza canadensis is discharged as natural plants antibacterial agent, can be improved fry immunity, enhance fry to disease Resistance；The advanced fry of yellow catfish cultivated using aquaculture management method of the present invention, very little piece survival rate are stablized 85% or more, are met Large-scale production demand.

Claims (1)

1. a kind of method for helping advanced fry of yellow catfish to effectively improve survival rate quickly through sensitive periods, it is characterised in that including following Step:

1. pond prepares and Conyza canadensis is launched

A, selection is had abundant water resources, water quality is good, pollution-free and into convenient pond is drained, and prepares pond, fertilizing water quality in advance；

B, pond is thrown before seedling 1~2 day, the Conyza canadensis on pond side is cut down, and be bundled into the grass bundle of 1~3kg/ handle；

2. fry pond-inputting and tame and docile food

A, after the flat trip of advanced fry of yellow catfish membrane, timely pond-inputting supplements grass bundle as needed；

B, stablize after fry pond-inputting 3~5 days, be gathered in Conyza canadensis grass bundle region, start to tame and docile the dedicated powder of ichthyophagy seedling Pelteobagrus fulvidraco, And gradually food dedicated No. 0 expanded pellet feed of Pelteobagrus fulvidraco is tamed and dociled in transition；

3. pond ecological is maintained to stablize

I, after taming and dociling and eat successfully, grass bundle in the timely cleaning pool avoids grass bundle stack retting from ruining water quality；

II carries out disinfection, bait throwing in and moisturizing work according to the actual situation.