CN1028312C

CN1028312C - Submersible net for breeding fish

Info

Publication number: CN1028312C
Application number: CN90105470A
Authority: CN
Inventors: 陈孝正
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-05-30
Filing date: 1990-05-30
Publication date: 1995-05-03
Anticipated expiration: 2005-05-30
Also published as: CN1056796A

Abstract

The present invention relates to a submersible fish herding net cage which belongs to an artificial breeding method for fish. In the method, according to the growth development characteristics of the fish, combined with artificial segment breeding, in the fast growth phase of adult fish, the sealed net cage loading the fish is plunged to the water ground by a ship to breed the fish with natural water grass resources. After natural fodder in a water area is depleted, the net cage is moved into other water areas to continue breeding the fish. Submersible net forms adapting water areas with different terrains are designed; a lifting rotary wheel and a lever-type moving machine are arranged on a ship table, so that the net cage can be plunged and moved. The method overcomes the shortage that the existing breeding methods via fences and net cages fail to fully utilize the water grass resources in the bottom layer of the water area, and obtains protein wanted by human with cheap cost.

Description

Submersible net for breeding fish

The invention belongs to the rearing method of fish.

China big water surface intensive culture fish are adopted dry-lot feeding and fixed cage rearing mostly at present.The fork location is generally selected in dry-lot feeding for use, utilizes bamboo, wire or net and main stem to isolate, and this feeding manner risen by seasonality and river topography influences greatlyyer, and available water surface area is very limited, and actual popularization condition is harsh; Fish culture in net pen is fixed mostly, adapts to big water surface intensive culture, the yield per unit area height, but it is big to consume forage volume, and the production cost of fish is than dry-lot feeding height, and required labour is many in bait throwing in, and labour intensity is big; The common problem that exists of two kinds of cultural methods is that the waterweeds resource to the bottom, waters can't make full use of.The object of the present invention is to provide rearing method of a kind of herbivorous fishes and used equipment,, solve human protein's shortage problem with a large amount of development herbivorous fishes.

The technical scheme that realizes the object of the invention is: according to the individual growth development characteristics of fish, quick vegetative stage adult fish, with ship the sealed net cage of feeding fish is dived into the water, utilize the natural waterweeds resource in waters to raise, after the feed in one section waters exhausts substantially, ship carries net cage again and enters other waters, location continuation raisings, realize that the intensification of water-bed high density herds foster, before entering sealed net cage and slipping into raising, for making fish adapt to big water surface water quality, fish should be changed over to slip in the net cage again after a period of time is left with in the phytal zone in big waters and herd fish, the best period that diving is herded fish should be chosen in the time of water temperature 〉=20 ℃, the facility of implementing submersible net for breeding fish comprises net cage and ship, net cage is sealed, and be designed to oval cartridge type by the waters landform, millstone type, ellipse, ship type and cone-shaped etc., have on the net cage by the lifting runner (11) on the building berth and control, be fixed on the suspension ring (4), to regulate the pull rope (2) of net cage high and low position, regulate the adjusting rope (6) of net cage in water body medium dip angle, there are several to be enclosed within on the support ring on the net bottom support ring (7) of formation net cage frame, shrink and the band (8) and several sinkers (9) that open dictyosome, can place several in the net makes dictyosome keep the movable ball float (3) of certain opening width, be used to herd the ship of fish, its ship is provided with the lever that the lifting runner (11) of regulating the net cage high and low position and mobile net cage use and moves machine (10).

Herding foster below in conjunction with accompanying drawing with the diving of grass carp is that example describes the present invention in detail.

Description of drawings:

Fig. 1 submersible net cage style schematic diagram;

(I) oval cartridge type

(II) ellipse

(III) millstone type

(IV) ship type

The cone-shaped submersible cage structure of Fig. 2 schematic diagram;

Schematic diagram is dived, risen to Fig. 3 net cage in herding the fish process;

That dives net when Fig. 4 herds fish carries and shifts schematic diagram.

The 1-buoy

The 2-pull rope

The movable ball float of 3-

The 4-suspension ring

The 5-net of diving

6-regulates rope

The 7-support ring

The 8-band

The 9-sinker

The 10-lever moves machine

11-lifting runner

Submersible net for breeding fish is according to the individual growth developmental stage characteristics of grass carp, can adopt the manual segmentation raising method, to utilize the water surface and feed economically, at the quick vegetative stage of adult fish, with ship sealed net cage is dived into the water, make full use of the natural waterweeds resource and raise.

Can be divided into three phases before grass carp diving is herded and supported raises;

1, fish fry vegetative stage

Be the growth of seedling phase of grass carp, can select the early rice rice seedling bed and one season semilate rice the land for growing field crops as the water surface of grass carp fry cultivation stage, this period the rice field the growing of water, gas, the suitable fish fry of mud temperature, the time is the 4-7 month.

2, big specification breeding phase

Quickening with the grass carp growth rate, the ecotope in rice field should not be cultivated large size fingerling, before arriving dry season, timely of the fingerling of paddy field aquaculture should be caught and put into than continuation cultivation in pool was to 1 year spring greatly, this stage serves as that the master raises with the promotion ramp with other green fodders such as the non-irrigated Sudan grass of training in native year or Mexico's fodder maizes.

3, herd the fish preadaptive phase

Because the paddy field, the pool and rivers and lakes reservoir etc. greatly the water quality of the water surface do not have certain difference, for preventing that grass carp from entering the discomfort that big waters causes suddenly in the pool, should be before formal diving be herded fish, a period of time is left with in the phytal zone that grass carp is placed on big waters, puts into sealed net cage after adapting to gradually again and utilizes ship to dive into the water to herd foster.

The diving of grass carp is herded fish

When the water temperature of water body rises to after 20 ℃ gradually, simultaneously grass carp also in the river, the phytal zone in big waters such as lake, reservoir adapted to a period of time, can herd fish.Yangtze river basin area generally the regularity at the beginning of 6 months rise disappear after, temperature, water temperature raise and are relatively stable, can implement the diving of grass carp and herd fish, herd to support can proceed to October then always.This section is fine period, pasture and water grow prolifically, the maximum period of grass carp fingerling food grass amount of also raising the previous year just.

When herding fish, slowly move into the luxuriant location of pasture and water by ship traction net cage and raise.After ship enters the raising location, shake the lifting runner (11) on the building berth, net cage is slipped into the water body bottom gradually.Because the riverbed undulating degree and the slope change in various waters differ,, can control the degree of closeness of net cage bottom and pasture and water by dual mode when net cage bottom during near pasture and water.(1) length of the adjusting rope (6) of adjusting net cage both sides, (2) regulate the rope length on the net cage bottom sinker (9) in advance.

After judging that with periscope or additive method the pasture and water in a location exhaust, be that available lifting runner (11) promotes the net of diving, rise to about 1 meter at the latent dried up end of sieve bottom, start ship and carry the mobile segment distance of the net of diving, slowly put down latent net again after arriving at another luxuriant area of pasture and water, place, and readjust the height of the net of diving, and then in this section waters, continue to raise, realize that so diving herds the diving of fish and dictyosome and move.

The net cage that diving is herded the fish employing has following several form:

(1) oval cartridge type (Fig. 1 I): the more smooth riverbed of suitable physical features is herded and is supported grass carp, and this adopts roller to advance when diving net mobile.

(2) ellipse garden type (Fig. 1 II): the more smooth riverbed of also suitable physical features uses, and its direct contact water grass area is bigger than oval cartridge type, and it is many to hold the fish amount, adopts rolling type to advance when mobile.

(3) millstone type (Fig. 1 III): the latent dictyosome of this form is long-pending little, adapts to waters, rough riverbed, and it is more flexible with diving to play water, carries convenience.

(4) cone-shaped (Fig. 2): this type is convenient to the flexible modulation volume, adapts to various waters, and it is many to hold fish quantity than millstone type, carries conveniently.

(5) ship type (Fig. 1 IV): also adapt to more smooth waters, riverbed, it is many to hold the fish amount, can adopt skiing type to advance.

According to pasture and water kind and growing state in the growth-development law of grass carp and the waters, the mesh of the net of diving should adopt two kinds of specifications:

Mesh diameter 4cm, suitable grass carp of putting into more than 0.3 jin; Mesh diameter 6cm, suitable grass carp of putting into more than 1 jin of weight.

When submersible net for breeding fish extremely can be put on market, directly will herd foster fish and be shipped to the certain location, and make to herd to support to combine, and need not fish for transportation.In longer distance transportation process, the net of should noting diving in approach torrent shoal with when going beyond barrier trips out the water surface, the fastening strainer shrinks dictyosome, with lever move machine with dictyosome near the hull both sides, and the net in the placement more ball floats, impel floatation surface on the dictyosome, utilize rope to keep net cage parallel with the ship direction of advance.When running into big barrier, cast anchor earlier stablize hull after, utilize lever to move the machine hauling and shift the angle of netting of diving, in case of necessity with the manual method thing that removes barriers with avoiding obstacles.

Submersible net for breeding fish has changed traditional breeding way, has promoted increasing substantially of fish culture productivity, develops into highly intensification from the artificial house and herds foster; Latent net herd support can overcome also that present fixed fish culture in net pen exists cause the bad growth that influences fish of water body exchange because of epiphytic algae on the casing, also can avoid because green fodder cultivation and artificial salvaging pasture and water and the required a large amount of labours of bait throwing in obtain animal protein with inexpensive way; Latent net is herded fish and is integrated to culture and fish for and carry, and has improved overall economic benefit.

Generally herd and support 3-4 after the month, calculate, herd in each net of diving and support 200 (20m of grass carp by every grass carp 3-5 jin that can increase weight grass carp ²), per unit area yield can reach 600-1000 jin, 30 latent nets of a manpower management, and 4.5-7.5 ten thousand then can make profits.

Claims

1, the rearing method of a kind of herbivorous fishes, it is characterized in that individual growth development characteristics according to fish, quick vegetative stage adult fish, with ship the sealed net cage of feeding fish is dived into the water, utilize the natural waterweeds resource in waters to raise, after feed exhausted substantially in one section waters, ship carried net cage again and enters other waters, location continuation raisings.

2, according to the rearing methods of the described herbivorous fishes of claim 1, before it is characterized in that entering the raising of sealed net cage diving, for making fish adapt to big water surface water quality, fish should be changed over to dive under water in the net cage after a period of time is left with in the phytal zone in big waters again and herd fish.

3,, it is characterized in that the dive into the water best period of herding fish of net cage should be chosen in the time of water temperature 〉=20 ℃ according to the rearing method of claim 1 or 2 described herbivorous fishes.

4, a kind of equipment of implementing the described herbivorous fishes rearing method of claim 1 that is specifically designed to, comprise net cage and ship, it is characterized in that net cage is sealed, and be designed to oval cartridge type by the waters landform, millstone type, ellipse, ship type and cone-shaped, have on the net cage by the lifting runner (11) on the building berth and control, be fixed on the suspension ring (4), to regulate the pull rope (2) of net cage high and low position, regulate the adjusting rope (6) of net cage in water body medium dip angle, there are several to be enclosed within on the support ring on the net bottom support ring (7) of formation net cage frame, shrink and the band (8) and several sinkers (9) that open dictyosome, can place several in the net makes dictyosome keep the movable ball float (3) of certain opening width, be used to herd the ship of fish, its building berth is provided with the lever that the lifting runner (11) of regulating the net cage high and low position and mobile net cage use and moves machine (10).