CN1857072A - Method for improving wood frog recapture rate in field - Google Patents

Abstract

The present invention belongs to the field of aquatic culture in agricultural technology, and is especially method of raising recapture rate of wood frog in field. The present invention includes: proper measures of capturing wood frog, including land capture, water capture, winter capture under ice and hill capture in early winter while wood frog immigrate from hill to river. The present invention can raise the recapture rate of wood frog in field greatly.

Description

The open-air method that improves wood frog recapture rate

Technical field

The invention belongs to the aquaculture in the agricultural technology field, is commodity frog recapture technology in a kind of wood frog propagation and the breeding process, relates in particular to the method that improves wood frog recapture rate under the field condition.

Technical background

China forest frog (Rana temporaia chensinesis David) is the wild economic batrachia of meat medicine dual-purpose, mainly is distributed in the northern area based on the area, Northeast China.China's Changbaishan area is the major production areas, and the institute wood frog that produces is big with individuality, fertility is strong, oil productivity is high, meat is good and nutritious and enjoy great prestige domestic and international.At present, the main breeding way in this district is open-air envelope ditch and ecological fence naturally, and only Chinese Jilin Province cultured area just reaches 270,000 hm ², produce the commodity wood frog per year more than 7,000 ten thousand.This plays an important role in the efficient development and use of wood frog resource.But, the development of aquaculture and the raising of economic benefit have been limited because the grasp of many sport technique segments is bad.The recapture of wood frog is one of important step during forest frog culture is produced, and the height of the rate of recapture is the key factor of decision culturing economic benefit.A considerable amount of foster frogs family is arranged, and very good although other links are grasped, autumn, the rate of recapture was not high, the economic benefit that the result still can not get.For a long time, the method for the open-air recapture wood frog of Changbaishan area mainly contains Polypropylence Sheet interception method, electric fishing, trench method, draws in the net to fish for subglacial and 5 kinds of methods such as fish for.These methods of integrated application, the rate of recapture of the commodity frog the situation of " wood frog is supported many, reclaims and but knows clearly " usually occurs also only below 1%, and percent of loss is bigger.

Summary of the invention

The present invention summing up and improving local peasant convention and catch on the basis of frog method, finds out the practical technique that is fit to local characteristics according to the biological property of wood frog and the natural characteristic of Changbaishan area with suiting measures to local conditions.Its objective is integrated assembling, a kind of open-air method that improves wood frog recapture rate is provided by these technical measures.

Main contents of the present invention comprise following technical measures.

1, land recapture.The land recapture is meant wood frog to go down the hill in this segment distance of going between the river, takes adequate measures effectively to tackle.Under late September to the early October wood frog in front of the mountains, at the woods edge of plant, wood frogs such as meadow, two sides, river, reservoir edge go down the hill to concentrate location and only way which must be passed, far bury last 1 timber every 1.5～2.0m, tie up to Polypropylence Sheet on the rod securely, form hedge, height is advisable with 60～100cm, perpendicular to the ground or to the direction that wood frog migration comes tilt slightly some all can, 20～30cm buries in the bottom.Wood frog come to and dig a ditch parallel, wide 80～100cm, dark 40～50cm apart from Polypropylence Sheet 30～50cm place far away with hedge.When wood frog runs into the obstruction of ditch and hedge, just fall in the ditch or climb to hedge bottom and be hunted down.In addition, in wood frog is gone down the hill the way, also can excavate several diameters and the degree of depth, put a gunnysack in the hole all at the heatable adobe sleeping platform of 50cm, sack open with cheat big or small consistent.Night, a light trap was set up near coal-mine top, and wood frog is looked for food because of being eager and falls in the hole, and just can receive and catch second day morning.To the plant in big reservoir and river is arranged in the culture zone, adopt this method to have better effect during Cold Dew to the Frost's Descent.But adopt the general recapture of land recapture method when 30%～40% of annual production.

2, water body is fished for.Water body is fished for the recapture process that is meant after wood frog goes into the river.Main method has following several.

(1) urn is caught: move about downstream according to wood frog and seek the characteristic of hibernacle, be adapted at the water surface not wide (3m is following), the degree of depth little (50cm is following), flow velocity (0.1m ³/ s is following) use in all less river.Early September begins the river in the culture zone is cleared up, and builds the urn rim of the mouth.The build method in comparatively ideal urn rim of the mouth is: nail on timber on the river surface of choosing, be woven into wall with wormwood and branch, bury with gravel and soddy soil, form " eight " font, stayed delivery port.When catching the frog with under urn to mouth, the wood frog trip of drifting about is downstream advanced urn and is hunted down.Urn that adopts willow Strip, shrubby flase indigo branch or shrub lespedeza bar to be woven into, this urn water permeability is good, and recapture efficient is higher.Can be better if in urn, throw in foreign material effects such as a little branches or stone brick.But this method recapture 20%～30%.

(2) turn over the stone method: after wood frog goes into the river, perch under crack of stone general inertia daytime, be difficult to seizure, at this moment availablely turn over the recapture of stone method with instruments such as urns.Wood frog goes into after peak period, river urn catches, and adopts this method effect better.

(3) net is caught: the used netting gear of this method is a lot, wherein to lift the best results of net.This kind netting gear has the handle of 2 long 1.2～1.5m, net length of a film 1.0～1.2m, and wide 60～80cm is provided with sinker and bottom line.When fishing for, a people top water behaviour net, another people stirs barriers such as stone, careless pier in the upstream with rake, drives wood frog, it is floated downstream enter in the net.This catching method and urn are caught and are carried out better effects if simultaneously.

(4) electric fishing: before and after mid-October, major part is through with after the wood frog of land life goes into the river, be introduced under the slabstone, in the tree root, temporary transient hibernacle such as fine sand heap, peak around the Frost's Descent, at this moment available magneto is aimed at the wood frog roost and is shocked by electricity, with its stunning.This is the better method of wood frog in the recapture river.The wood frog of being hit unconsciously can revive after 30～40 minutes.This method rate of recapture is higher, generally 40%～50%.But catch kind of a frog and should not adopt this method.

(5) draw the nest method: under the tree root of river bank and the careless pier easily by river scour out cavity, the good place of wood frog overwintering often here.Earlier touch or in the hole, stir with stock with hand, judging whether the frog is arranged in the hole, and then seizure.Sometimes can catch up to a hundred wood frogs in 1 hole.Wood frog also has the habit of perch in the gravel of river bed.At this moment wood frog health often is embedded in the sand heap and forms the roundlet nest, and the gravel in the nest is fresh and loose, and central authorities protrude, and are easy to be found.In case finding has this parcel, stretches out one's hand and can grasp wood frog.In addition, also be everlasting river bend place of wood frog burrows and makes washbasin shape mud nest, and available write by hand net is fished for.Draw when nest method seizure wood frog " is cleared out a gathering place " in the recapture later stage usually and use.

(6) grass is trapping: be bundled into grass handle with branch, wormwood, put into the river bed, lure the wood frog hibernation of entering.Take out grass just capturing the wood frog that hides therein.This method is applicable to that wood frog goes down the hill the initial stage river when big.

(7) blocking cut-off process: select tributary or river, build a little check dam, change current direction and block river, open the bigger stone piece of river bed portion, can capture perch wood frog below stone.This method is applicable to fishes for the later stage, a period of time before river freezes.

3, advance the mountain recapture early winter.Some plant's ditch trouble condition is better, and ditch deep water is rich, and the dry branches and fallen leaves bed thickness reaches more than the 50cm, and leaf is moist down, and temperature is suitable, and the wood frog that can not be had, and survives the winter on the spot.The weather arid in autumn in time that also has, temperature descends suddenly and enters winter rapidly, and the wood frog that has has little time also to survive the winter on the spot in order to adapt to sudden environmental change.This wood frog that survives the winter on the spot, many mountains turn over leaf, move withered tree, relieve the burden, dig recaptures such as heatable adobe sleeping platform.In the thicker plant of litter horizon, but during early November to the middle ten days recapture to the wood frogs that survive the winter on the spot in a large number.

4, winter, subglacial was fished for.Crowdedly mutually between the wood frog individuality of gregarious hibernation often form a quantity and reach hundreds of only even thousands of wood frog heap together, majority concentrates on place, river bend, deep water place, silt alluvial place, warms up places such as fountain and artificial overwintering pond.According to this characteristic, ice sheet can be opened in the winter time, with the write by hand net or draw in the net for a short time to fish for.

The wood frog of Changbaishan area generally begins to go down the hill in late September to early October and survives the winter into the river, and late October is the peak period of going down the hill.During this as much as possible recapture some 2 ages the above commodity frog, to improve the economic benefit of supporting the frog.Facts have proved that said method can realize from the water body to land, from comprehensive, the three-dimensional recapture to the mountain under the mountain, its effect increases greatly.At present, use this method can make the rate of recapture of wood frog bring up to 3% ~ 5%, economic benefit obviously improves.

Embodiment

Application example

1996～calendar year 2001, abovementioned technology is adopted in wood frog aquaculture proving ground, big spring, the efficient scientific and technological demonstration area of Liuhe County, Jilin Province holy water, recapture commodity wood frog is 80859 altogether, total rate of recapture 3.834%, the recapture commodity frog is 13476 every year on average, the rate of recapture 3.522% (seeing attached list).Its way is: in wood frog is gone down the hill the way in river, adopt two kinds of land recapture methods such as interception and lamp light trapping; After wood frog goes into the river, based on urn catch, net is caught and electric fishing, is aided with grass trapping, blocking cut-off process with turn over the stone method, " clear out a gathering place " to draw the nest method at last; Adopt mountain recapture method before going into the winter; Carrying out subglacial winter fishes for.The integrated use of above-mentioned measure obviously improves the rate of recapture of commodity wood frog, and economic benefit increases than in the past more than 10 times.

Subordinate list: 1996～calendar year 2001 wood frog recapture situation

Year	Tadpole quantity (ten thousand)	Recapture commodity frog quantity (only)	The rate of recapture (%)
				1,996 1,997 1,998 1,999 2,000 2001 add up to	13.72 22.91 57.66 45.72 43.46 27.42 210.89	2648 6232 21280 22494 17949 10256 80859	1.93 2.72 3.69 4.92 4.13 3.74 3.834

Claims (4)

1, a kind of open-air method that improves wood frog recapture rate is characterized in that going down the hill to going into the river wood frog, takes adequate measures effectively to tackle, described adequate measures comprise that land recapture, water body are fished for, winter subglacial fish for the winter at the beginning of advance the mountain recapture.

2, the open-air method that improves wood frog recapture rate according to claim 1 is characterized in that under late September to the early October wood frog that, wood frog goes down the hill to concentrate or only way which must be passed near plant in front of the mountains, the interception of Polypropylence Sheet grid is set, simultaneously, the bracket lamp of digging pit is aided with the pocket method and catches; After wood frog goes into the river, adopt respectively that urn catches, turns over that stone method, net are caught, electric fishing, draw the nest method, grass is caught trapping and blocking cut-off process; Time early winter, go up a hill and take to turn over leaf, move withered tree, remove stone, dig heatable adobe sleeping platform, those do not go down the hill recapture and the wood frog that survives the winter on the spot; River Feng Binghou opens ice sheet, at the turning, river, profundal zone, silt alluvial place, warm fountain and artificial overwintering pond, with the write by hand net or draw in the net the wood frog that the recapture subglacial survives the winter for a short time.

3, the open-air method that improves wood frog recapture rate according to claim 1 and 2, it is characterized in that described Polypropylence Sheet grid interception method, be at the big wood frog only way which must be passed of going down the hill, far bury 1 timber every 1.5～2.0m, tie up to Polypropylence Sheet on the rod securely, formation grid, height 60～100cm, 2.～30cm buries in the bottom; The direction of grid, the one, perpendicular to the ground, the 2nd, the direction of coming to the wood frog migration tilts slightly; Simultaneously, wood frog migration come to and the place ahead 30～50cm parallel with grid dig out a raceway groove that 80～100cm is wide, 40～50cm is dark at a distance, form 2 road obstacles, the increase interception result.

4, the open-air method that improves wood frog recapture rate according to claim 1 and 2, it is characterized in that described urn method for catching is, in the river not wide at the water surface, that the degree of depth little, flow velocity is all less, early September begins to clear up the river course, main rid is built the urn rim of the mouth; Earlier on the river surface of choosing, accomplish fluently timber, be woven into wall, bury with gravel and soddy soil again, form splayed mouth door, stayed delivery port with wormwood and branch; Urn that adopts willow Strip, shrubby flase indigo branch or shrub lespedeza branch to be woven into is embedded in Kou Menchu with it; Throw in foreign material such as a little branches, brick and tile stone in urn.