CN101978822A

CN101978822A - Method for incubating tilapias

Info

Publication number: CN101978822A
Application number: CN2010105675787A
Authority: CN
Inventors: 李瑞伟; 王辉; 彭俊; 梁华盛; 黄华明; 王海贞
Original assignee: MAOMING MAONAN SANGAO FISHERY CO Ltd
Current assignee: MAOMING MAONAN SANGAO FISHERY CO Ltd
Priority date: 2010-12-01
Filing date: 2010-12-01
Publication date: 2011-02-23

Abstract

The invention relates to a method for incubating tilapias. In the method, fertilized eggs are put into an incubation barrel (1) containing water, wherein a water inlet pipe (2) of the incubation barrel extends inside from top to bottom, a water outlet pipe (3) is positioned on the upper part of the incubation barrel, a 1.5 to 2.5 cm gap is formed between an end face (5) of a water inlet and the inner surface (4) of the bottom of the barrel, the inner diameter of the barrel mouth is 18.5 to 22.5 cm, the inner diameter of the barrel bottom is 7 to 11 cm, the inner diameter of the water inlet pipe is 2.6 cm, the inner diameter of the water outlet pipe is 2.75 cm, the depth from the inner end pipe opening center of the water outlet pipe to the inner surface of the barrel bottom is 20 cm, the water inlet pipe is impacted by water flow, the incubation is performed for 2 to 6 days to obtain initially incubated fish fries, and the thrown-in density of the fertilized eggs is 10,000 to 20,000 per each liter of water; when the fertilized eggs are just put into the incubation barrel, the water flow rate is controlled to be 8 L/min, and after 24 hours, the flow is gradually decreased each three hours, and the decreased amount of each time is 3 percent of the previous flow; and when more than 90 percent of the fertilized eggs are incubated out of membranes, the water flow rate is gradually increased each 2 hours, and the increased amount of each time is 3 percent of the previous flow. The method is favorable for rapid development of the fertilized eggs, shortens the natural incubation time, and has a high survival rate.

Description

The hatching m of Tilapia mossambica

Technical field

The invention belongs to the aquatic fry growing technical field, specifically the hatching m of a kind of Tilapia mossambica.

Background technology

Tilapia mossambica is that Perciformes Callichthyidae Tilapia mossambica belongs to, and belongs to the tropical fish, has kind more than 100, and majority originates in Africa.Tilapia mossambica has grow fast, characteristics such as feeding habits are wide, fertility is strong, disease is few, meat is good, output height.Tilapia mossambica is for mouthful incubating property fish, and when water temperature reached more than 22 ℃, sexually matured female, milter began the mating fertilization, and after forming fertilization and incubating, raun sucks fertilized egg in the oral cavity rapidly and hatches.An about week, just hatch fry, fry spues from female lymphogranuloma inguinale, and beginning is ingested in water, is grown.

The nature hatching pattern has following some shortcomings: the female lymphogranuloma inguinale time of incubating is grown, the fertilized egg hatching rate is low, survival rate is low, and the specification of emerging is irregular.Problems such as China ubiquity Tilapia mossambica parent germplasm is degenerated at present, fertility descends, the seasonal weather restriction is obvious, batch production production degree Tilapia mossambica breeding coverage rate not high, high-quality is low have restricted the development of Tilapia mossambica industrialization; Even in the enterprise that batch production is produced,, cause Tilapia mossambica artificial incubation rate to exceed seldom than hatching naturally owing to aborning the factor of some artificial incubation is held inaccurate (as to the density of ovum and the control of current).It is regional wide that the suitable Tilapia mossambica in coastal areas of southern China area is cultured, and Tilapia mossambica is cultured has huge potentiality to be exploited and advantage.And seed is restricting the development of Tilapia mossambica industry constantly.

Summary of the invention

The object of the invention provides a kind of quick growth that helps fertilized egg, can improve the hatching m of the Tilapia mossambica of hatchability of fertile eggs and survival rate.

The hatching m of a kind of Tilapia mossambica, fertilized egg putting into filled in the hatching pail of water, the water inlet pipe of this hatching pail stretches into from top to bottom, and water inlet mouth end face has 1.5～2.5 centimetres gap with inner surface at the bottom of bucket, wherein, bung internal diameter 18.5～22.5cm, bucket end internal diameter 7～11cm, the water inlet pipe internal diameter is 2.6cm, the outlet pipe internal diameter is 2.75cm, mouth of pipe center, outlet pipe inner end inner surface degree of depth at the bottom of bucket is 20cm, adopts water impact by water inlet pipe, hatches promptly to get in 2～6 days just to incubate the fish son; It is 1～20,000/premium on currency that described fertilized egg is thrown in density; When just putting into fertilized egg, water velocity is controlled at 8L/min, after 24 hours, reduces gradually every 3 hours flows, each amplitude that reduces be last time flow 3%; Treat to increase gradually every 2 hours water velocities behind the 90% above incubating oosperm membrane, each amplitude that increases be last time flow 3%.

The control of above-mentioned water velocity can freely be swum out of hatching pail substantially with the fry that guarantees incubation of membrane.Fertilized egg is fully rolled, and water velocity is regulated, favourable growing environment can be provided, fertilized egg is grown fast, and guarantee that the fry quality is higher according to the developmental state of fertilized egg.

The temperature of hatching water is controlled at 28～30 ℃, and salinity is controlled at 4～6 ‰, pH6.5～8.3, oxygen content 4～6mg/L.

Hatching pail soaked 30 minutes with 30ppm～50ppm liquor potassic permanganate before use.

The present invention helps the quick growth of fertilized egg, has shortened natural brooding time, and the survival rate height.

In the present invention, fertilized egg can obtain according to a conventional method.

Description of drawings

Fig. 1 is the structural representation of hatching pail of the present invention.

Embodiment

Embodiment:

Fertilized egg obtains according to a conventional method.

See Fig. 1, hatching pail 1 soaked 30 minutes with the 40ppm liquor potassic permanganate before use, fertilized egg putting into filled 1 li of the hatching pail of water, the water inlet pipe 2 of this hatching pail stretches into from top to bottom, outlet pipe 3 is positioned at hatching pail 1 top, wherein, water inlet mouth end face 5 has 2 centimetres gap with inner surface 4 at the bottom of bucket, bung internal diameter 20.5cm, bucket end internal diameter 9cm, water inlet pipe 2 internal diameters are 2.6cm, outlet pipe 3 internal diameters are 2.75cm, outlet pipe 3 inner end mouth of pipe center b inner surface 4 degree of depth at the bottom of bucket are 20cm, adopt water impact by water inlet pipe 5; It is 1～20,000/premium on currency that described fertilized egg is thrown in density; When just putting into fertilized egg, water velocity is controlled at 8L/min, after 24 hours, reduces gradually every 3 hours flows, each amplitude that reduces be last time flow 3%; By observing, treat to increase gradually every 2 hours water velocities behind the 90% above incubating oosperm membrane, the amplitude of each increase be last time flow 3%.After 5 days (water velocity surpass 9.5L/min), incubating oosperm becomes just to incubate the fish son and enters collecting pit from hatching pail 1 upper end outlet pipe 3 with current and finally hatch and grow seedlings.In above-mentioned, the temperature of hatching water is controlled between 28～30 ℃, and salinity is controlled between 4～6 ‰, between pH6.5～8.3, between oxygen content 4～6mg/L.

Once tested in the high breedings breeding of Maoming City luxuriant southern three bases as stated above, fertilized egg is about 56000～60000, hatches fry and is about 50000 tails, and survival rate is near 90%.

Claims

1. the hatching m of a Tilapia mossambica, it is characterized in that being, fertilized egg putting into filled hatching pail (1) lining of water, the water inlet pipe of this hatching pail (2) stretches into from top to bottom, outlet pipe (3) is positioned at hatching pail (1) top, wherein, water inlet mouth end face (5) has 1.5～2.5 centimetres gap with inner surface (4) at the bottom of bucket, bung internal diameter 18.5～22.5cm, bucket end internal diameter 7～11cm, water inlet pipe (2) internal diameter is 2.6cm, outlet pipe (3) internal diameter is 2.75cm, mouth of pipe center, outlet pipe (3) inner end inner surface (4) degree of depth at the bottom of bucket is 20cm, adopts water impact by water inlet pipe (2), hatches promptly to get in 2～6 days just to incubate the fish son; It is 1～20,000/premium on currency that described fertilized egg is thrown in density; When just putting into fertilized egg, water velocity is controlled at 8L/min, after 24 hours, reduces gradually every 3 hours flows, each amplitude that reduces be last time flow 3%; Treat to increase gradually every 2 hours water velocities behind the 90% above incubating oosperm membrane, each amplitude that increases be last time flow 3%.

2. the hatching m of Tilapia mossambica according to claim 1 is characterized in that being, the temperature of hatching water is controlled at 28～30 ℃, and salinity is controlled at 4～6 ‰, pH6.5～8.3, oxygen content 4～6mg/L.

3. the hatching m of Tilapia mossambica according to claim 1 is characterized in that being, hatching pail soaked 30 minutes with 30ppm～50ppm liquor potassic permanganate before use.

4. the hatching m of Tilapia mossambica according to claim 1 is characterized in that being, hatching pail is a Plastic Drum.