CN102640718A

CN102640718A - Method utilizing small pond net cage to culture polyodon spathula fry and net cage

Info

Publication number: CN102640718A
Application number: CN2012101329996A
Authority: CN
Inventors: 董宏伟; 邹作宇; 袁美云
Original assignee: Harbin Academy of Agricultural Sciences
Current assignee: Harbin Academy of Agricultural Sciences
Priority date: 2012-04-20
Filing date: 2012-04-20
Publication date: 2012-08-22

Abstract

A method utilizing a small pond net cage to culture polyodon spathula fry and the net cage belong to aquaculture technologies. The culture method comprises: (1) casting the fry, casting 40-50 polyodon spathula juvenile fry of over 5cm in each cubic meter of water body, and when the fry enters the cage, the water temperature difference is within +/-2 DEG C; (2) feeding baits, feeding fresh biological baits which are large cladocerans for 4 times in the daytime respectively at 5, 10, 14 and 16, enabling the optimal feeding amount in each milliliter of water body to be 10 large cladocerans, and opening a trap lamp to lure zooplankton to feed the fry from 19 in the evening to 5 next day; and (3) using an instrument to detect oxygen dissolving quantity of the pond water body at least once each day, and enabling the oxygen dissolving quantity to be larger than 6mg/L. The specifications of the net cage are 4m*2m*1.5m, and the mesh is 3mm. The method and the net cage structure are simple, the culture survival rate is high, the growing speed is quick, the culture cost and the fry cost are low, and polyodon spathula can be caught easily.

Description

The pond small-sized net cage is cultured paddlefish seed method and net cage

Technical field

The invention belongs to aquaculture technology, relate generally to breeding method and the cage structure of a kind of paddlefish seed.

Background technology

Paddlefish is subordinate to Gadiformes, Polyodontidae, originates in North America, is a kind of large-scale economic freshwater fish; It is strong to have adaptability, and growth is rapid, and feed source is extensive; Advantage such as be easy to fish for, habit is similar with the bighead of China, and its nutritive value and economic worth are higher than bighead far away; And be food with the zooplankton throughout one's life, water environment is had protective effect.But,, generally need 7-12 because the paddlefish age at sexual maturity is longer; And majority has just reached commercial specification and has promptly fished for sale; Cause paddlefish parent population quantity few, the fish-egg price is high, and the culturist is many to be placed on the breed of indoor or outdoors cement pit to seed rearing; Therefore, cultured area is little, the breed survival rate is low, aquaculture cost is high, seed costs an arm and a leg.

Summary of the invention

The object of the invention is exactly the problem that exists to above-mentioned prior art, and research provides a kind of pond small-sized net cage to culture paddlefish seed method and net cage, reaches to improve the purpose of culturing survival rate, reducing aquaculture cost and seed price.

The objective of the invention is to realize like this:

1., the putting in a suitable place to breed of fry the pond small-sized net cage is cultured paddlefish seed method, and: in every cubic metre of water body, throw in the paddlefish postlarva fry 40-50 tail more than 5 centimetres, water temperature difference is in ± 2 ℃ during the fry inlet; 2., throwing something and feeding of bait: the large-scale cladocera of the fresh and alive biological feed of throwing something and feeding daytime 4 times; Time is respectively at 5 o'clock, 10 o'clock, 14 o'clock and 16 o'clock; It is good that feeding volume contains 10 large-scale cladoceras by every milliliter of water body, and opened light trap up to 5 o'clock next day and lure zooplankton to feed to raise night 19; 3., with instrument at least detection cell pool every day water body dissolved oxygen amount, pond waters dissolved oxygen amount＞6mg/L.

A kind of pond small-sized net cage is cultured paddlefish seed net cage, and cage size length * wide * height is 4 meters * 2 meters * 1.5 meters; The net cage mesh is 3 millimeters.

The invention solves paddlefish seed outdoor ponds and culture the high problem of low, the indoor cement pit aquaculture cost of survival rate; Have cultural method and cage structure simple, culture the characteristics that survival rate height, fast growth, aquaculture cost and seed are cheap, be easy to catch, for the effect of actively promoting is played in industrialization, large-scale production and the development of paddlefish artificial feeding.

Embodiment

Be described in detail in the face of embodiment of the present invention down.

1, the selection in pond: smooth, good, the weed free pond of water conservation condition at the bottom of the selection pond, the water source is a well water.The dry method sterilization of cleaning up the pond is adopted in preceding 20 days of paddlefish cartonning, and quicklime 100kg is used in every mu of pond, preceding 15 days of fry cartonning, and chicken manure 100-150kg is executed in every mu of pond, then water filling 1.5m.

2, cage structure and setting: use diameter to be 8-10cm, reinforcing bar is made and the identical framework of net cage size, is used for the supporting network box shape; Make flotation gear with foam; Tank material is selected monolayer polyethylene tubercle net sheet, cage size 4m * 2m * 1.5m, mesh size 3mm for use.Every net cage is provided with separate frame; The framework entry generally exceeds water surface 15-30cm after bearing a heavy burden, and the long limit of every row's net cage frame is vertical with water (flow) direction and firm with frame fixation; Every row's framework in water at a distance of greater than 50cm; Net cage 7 days before fingerling stocking are provided with entry, give birth to attachment so that it, and avoid after the fry cartonning and casing friction injury fish.

3, putting in a suitable place to breed of fry: the fry specification should be greater than 5cm, require best in quality, physique is healthy and strong, anosis no wound, and requires neat specification (the body weight deviation between the individuality is less than 10%).Throw in paddlefish postlarva fry 40-50 tail in every cubic metre of water body.The paddlefish seed changes responsive to water temperature, the temperature difference is unsuitable excessive during the seed inlet, be no more than ± 2 ℃ be advisable, simultaneously, sterilize with the fish body that the saline solution of 1.5%-2% carried out 8-10 minute.

4, throwing something and feeding of bait: the large-scale cladocera of throwing something and feeding daytime, open light trap and lure zooplankton night.The large-scale cladocera of the fresh and alive biological feed of throwing something and feeding daytime 4 times, the time was respectively 5 o'clock, 10 o'clock, 14 o'clock and 16 o'clock, and feeding volume contains 10 large-scale cladoceras by every milliliter of water body and is advisable, and should often observe the food density situation, in time adjusts feeding volume.According to the phototaxis of zooplankton, every net cage is installed a solar energy insect-trapping lamp, night 19:00 up to morning next day 5:00 point open light trap, improve food organisms density in the net cage, practice thrift feed cost, satisfy the paddlefish requirement of growing.

5, daily management: gently clean net cage once with hairbrush every day, makes the inside and outside water circulation of casing unimpeded, keeps the water body cleaning, makes dirt and ight soil discharge casing.Oxygen increasing equipment is installed, is measured dissolved oxygen amount every day, require greater than 6mg/l.

Claims

1., the putting in a suitable place to breed of fry 1. a pond small-sized net cage is cultured paddlefish seed method, it is characterized in that:: in every cubic metre of water body, throw in the paddlefish postlarva fry 40-50 tail more than 5 centimetres, water temperature difference is in ± 2 ℃ during the fry inlet; 2., throwing something and feeding of bait: the large-scale cladocera of the fresh and alive biological feed of throwing something and feeding daytime 4 times; Time is respectively at 5 o'clock, 10 o'clock, 14 o'clock and 16 o'clock; It is good that feeding volume contains 10 large-scale cladoceras by every milliliter of water body, and opened light trap up to 5 o'clock next day and lure zooplankton to feed to raise night 19; 3., with instrument at least detection cell pool every day water body dissolved oxygen amount, pond waters dissolved oxygen amount＞6mg/L.

2. a pond small-sized net cage is cultured paddlefish seed net cage, it is characterized in that cage size length * wide * height is 4 meters * 2 meters * 1.5 meters; The net cage mesh is 3 millimeters.