CN106857427A - A kind of natural fry finishing device of yellowfin spine porgy and its fish for transportation resources - Google Patents

Abstract

The invention relates to the technical field of fishing devices, in particular to a fishing device for yellowfin roughy natural fry and a fishing and transportation method thereof. A yellowfin roughy natural fry fishing device includes a fishing device and a fish collecting device, and the fishing device is connected with the fish collecting device. The invention uses the method to catch and transport the natural yellowfin roughy fish fry, which not only has a large catch amount and low labor cost, but also is eco-friendly, does not damage other organisms, does not have adverse effects on the marine environment ecology, and can maximize the survival of the fish fry Rate. It is suitable for the fishing production and scientific research investigation of yellowfin roughy seabream fry, which is conducive to the standardization and standardized operation of fry and juvenile fish resource investigation, and reduces the waste of natural fry resources caused by a large number of deaths in natural fishing. Provide substantial technical support for continuous utilization.

Description

A yellowfin roughy natural fry fishing device and its fishing and transportation method

technical field

The invention relates to the technical field of fishing devices, more specifically, to a fishing device for yellowfin roughy natural fry and a method for fishing and transporting the same.

Background technique

Yellowfin seabream, also known as yellowfin seabream, belongs to Perciformes, Seabreamidae, and Seabream genus. Commonly known as yellow wall, yellow foot stand, red wing, etc., it is widely distributed in the southeast coast of my country and is a common warm-water bottom fish in shallow seas. , its meat is fresh and tender, and it is rich in nutrition. It is deeply loved by consumers and is an important marine economic fish. In recent years, it has become one of the important species in the proliferation and release of fishery resources in the South China Sea. Therefore, there is an increasingly strong demand for yellowfin roughy fry in mariculture, multiplication and release.

The fishing of natural fry has a long history in our country, and a moderate amount of artificial fishing will not affect its supplement to the natural population. Although the artificial propagation technology of yellowfin roughy seabream has matured, in comparison, catching natural fry can not only reduce production costs, but also save the cost of auxiliary equipment such as broodstock ponds, spawning ponds, and holding ponds required for artificial reproduction. In addition, the individual vitality and survival rate of natural fry are relatively high, which is of certain significance to the purification and rejuvenation of fish species, and to avoid the phenomenon of individual degeneration and shrinkage caused by "inbreeding". Therefore, in actual production, the scientific and standardized fishing of fish fry is to accurately evaluate the resource amount of fish fry, the amount that can be caught, carry out continuous development and utilization, how to ensure the survival rate of fish fry in fishing natural fry, and how to ensure the survival rate of fish fry in the process of aquaculture production and resource multiplication and release. It is very important, not only in the fishing link, but also in other links of fry transportation to the pond.

Currently, there are two main methods of fry fishing:

(1) The first method is manual fishing. Specifically, at the wharf and coastal shoals, seedling catchers hold a simple hand fork net device with both hands, push the hand fork net forward in the water, keep their eyes on the water surface all the time, and catch the fish fry. Lift the net and put the fry into the fry collection bucket hanging on the body.

The main problem of this method: the catch of fish fry is very limited, and the labor cost is high (time-consuming and labor-intensive).

(2) The second method is trawling. Specifically, winged trawl gear is used to tow and fish by motorized boats.

The main problem of this method is that although the efficiency of fishing by hand is much higher than that of traditional manual fishing, the trawling net makes the fish fry densely concentrated in the mesh bag, which is very easy to squeeze and collide with each other and cause mechanical damage, which reduces the survival rate of fish fry.

After the fry are caught, how to transport the fry to the destination under the premise of ensuring the survival rate is also a key problem to be solved. The current problem is that there is a lack of a set of systematic guidance methods, including the whole process from catching yellowfin roughy natural fry to ponds (or putting them into cages) to start breeding.

Contents of the invention

In order to overcome at least one of the above-mentioned defects in the prior art, the present invention provides a yellowfin roughfish natural fry fishing device and its fishing and transportation method, which not only has a large catch, low labor cost, but also is eco-friendly and does not damage other organisms. , It does not have adverse effects on the marine environment and ecology, and at the same time it can maximize the survival rate of fry.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a yellowfin roughy natural fry fishing device, which includes a fishing device and a fish collecting device, and the fishing device is connected with the fish collecting device.

In the present invention, in the fishing process, the principle of seawater ebb and flow is fully utilized, and the designed device for automatically catching natural fry at sea has the advantages of large catch volume, low cost, and high survival rate of fry. In other links, the key operation links and precautions of each node are elaborated in detail. The present invention can not only be applied to fish fry fishing production, but also can be used as a standardized method for biological investigation and research such as the distribution of natural fry resources, which is conducive to quantitatively comparing the differences in seasons, years, locations, etc. It provides a substantial basis for the standardization research of resource quantity and catchable quantity, standardized fishing and fishery management.

Further, the fishing device is a truss-shaped net body with openings on the left and right sides, and the opening at the narrower end is connected with the fish-collecting device. The above-mentioned structure is stable, and the fish fry fishing efficiency is high. During the fishing process, the net gear is fully utilized to realize the passive fishing of fish fry under the action of the tide and tide, which saves a lot of manpower and material resources, and is eco-friendly. It is harmful to the marine environment and other marine species. Accidental capture with minimal damage.

Further, the fishing device includes a net body, net sleeves, net sleeve ropes, and stakes, and the net body is made of four trapezoidal nets, upper, lower, left, and right; the net sleeves are composed of two pieces The rectangular net is distributed on the left and right sides of the opening at the wider end; the net sleeve ropes include the upper and lower end ropes of the net sleeve, and the net sleeve is stretched into a rectangle; the wooden stakes are connected with the net sleeve ropes, and the wooden stakes are inserted into the sea The device can be fixed.

Further, the said fish collection device is a round table-shaped net cage, including bottom steel ring, middle and upper steel ring, top steel ring, side steel bars, bottom netting, side netting, pull rope, anchor rope, sinking anchor;

The side steel bars are connected to the bottom steel ring, the middle and upper steel ring, and the top steel ring, and the side steel bars are symmetrically distributed from the bottom steel ring to the top steel ring, and the side mesh is clothed on it; the bottom steel ring The bottom net is fixed on the top, and the pull rope is connected to the top of the opening of the fishing device from the top steel ring, and the anchor rope is connected with the sinking anchor.

Further, several sinkers are evenly fixed on the bottom steel ring, and there are cross steel bars fixed inside the steel ring, and several floaters are evenly fixed on the middle and upper steel ring.

Further, one end of the anchor rope is connected to the cross steel bar of the bottom steel ring, and the other end is connected to the sinking anchor; there is an opening on the net between the middle and upper steel ring and the bottom steel ring, which is relatively close to the fishing device. The opening at the narrow end is joined around the seam.

A method for fishing and transporting yellowfin roughy natural fish fry fishing device, wherein: comprising the following steps,

S1. Fishing: Use this fishing device to fish, and you can use one or more fry fishing devices lined up as needed;

S2. Temporary support: Temporary support in live water tanks or temporary support in nursery tanks;

S3. Transportation: short-distance transportation or long-distance transportation;

S4. Lower pond: fry in the oxygen bag or in the running water wheel.

In the step S1, the fishing time and location: during November to February of the following year, select a location where the coastal estuary and the inner bay where the brackish and fresh water meet, the bottom is gravel, and the tide is obvious.

In the step S2, the living water tank is temporarily raised: the collected fry are selected, and the healthy fish with complete body surface and normal swimming are screened; the selected fish are temporarily kept in the live water tank of the ship, and then the ship is docked in In the sea area with good water quality and gentle current near the fishing point, the holding time should not be less than 1 day;

Temporary breeding in nursery tanks: screen fry and then temporarily raise them in 500L nursery tanks with a temporary breeding density of 400-500 fish per tank. The seawater used should be similar to the water temperature, salinity and pH of the fishing point, and an aerator should be used , the holding time is not less than 1 day.

In the step S3, short-distance transportation: short-distance transportation with a transportation time of less than 5 hours, the fry are fasted for 1 day before transportation, and the fry are shipped in a double-layer oxygen bag, and 1/3 of the seawater in the holding area is added to the bag, filled with oxygen , tie the mouth of the bag tightly, then seal it in a foam box, put an appropriate amount of ice cubes at the bottom of the box to cool down, pack 4 bags in each box, and hold 8000-12000 fish fry in each bag;

Long-distance transportation: For long-distance transportation with a transportation time of more than 5 hours, stop eating for 1 day before transportation, and use running water trucks to transport fish fry, 40,000-50,000 fish fry per cubic meter of water, the water used is the same as the temporary breeding water, and MS222 anesthetic is added to the water. Use 1g MS222 for 500L water and use the air pump to increase oxygen;

In the step S4, the fish fry in the oxygen bag: after the fish fry transported by the oxygen bag reach the destination, first put the oxygen bag in the fish pond where it is put in, and adapt to it for 10-15 minutes; then untie the mouth of the bag, and then Inject doubled pool water into the bag so that the water temperature in the bag is basically the same as the pool water temperature, let the fry soak for 5-10 minutes and then slowly pour the fish with water into the pond;

Fry in the running water truck: After the fry are transported by the running water truck, after arriving at the destination, first adjust the water temperature of the breeding pond to be similar to the water temperature of the running water truck, then put the fry into a basin or bucket first, and slowly add water from the pool to the basin or bucket After 10 minutes, the fry will slowly adapt to the fish, and then slowly pour the fish with water into the pond.

Compared with the prior art, the beneficial effect is that the invention adopts the method to catch and transport the natural fry of yellowfin roughy, which not only has a large catch amount and low labor cost, but also can maximize the survival rate of the fry. It is suitable for fishing production and scientific research investigation of yellowfin roughy, and provides substantial technical support for the utilization and protection of natural fry.

Description of drawings

Fig. 1 is a structural schematic diagram of the fishing device of the present invention.

Fig. 2 is a schematic flow chart of the present invention.

detailed description

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

As shown in Figures 1 and 2, it includes a fishing device and a fish collecting device. The fishing device has an opening on the left and right, and the opening at the narrower end is connected to the fish collecting device. The fishing device includes a truss-shaped net body 1 , rectangular net sleeve 2, net sleeve rope 3, stake 4, the net body 1 is formed by four trapezoidal nets around the upper, lower, left and right, and the net sleeve 2 is composed of two rectangular nets, distributed in The left and right sides of wider one end opening, net sleeve rope 3 comprises net sleeve upper end and lower end rope, and net sleeve is strutted into a rectangle, and stake 4 is connected with net sleeve rope, and stake can be fixed this device in inserting sea. The fish collection device is a cylindrical net cage, including bottom steel ring 5, middle and upper steel ring 6, top steel ring 7, side steel bars 8, bottom netting 9, side netting 10, pull rope 11, anchor rope 12 1. Anchor sinking 13, several sinkers 14 are evenly fixed on the steel ring at the bottom, there are cross steel bars 15 crossed and fixed inside the steel ring, bottom netting is arranged on the steel ring, and several floaters 16 are uniformly fixed on the steel ring at the middle and upper parts , so that the part above the middle and upper steel rings is exposed to the water surface, the side steel bars are symmetrically distributed, connected from the bottom steel ring to the top steel ring, and covered with side nets, and the pull rope is connected from the upper steel ring to the fishing device The top of the opening is convenient for collecting the net. One end of the anchor rope is connected to the cross steel bar of the bottom steel ring, and the other end is connected to the sinking anchor 13 to play the role of fixing the fish collection device. Between the middle and upper steel ring 6 and the bottom steel ring 5 A rectangular opening is connected with the opening at the narrower end of the fishing device around the seam on the net clothing between.

In this embodiment, the above-mentioned mesh sheets are made of polyethylene material with a mesh size of 5 mm. Above-mentioned rope is all nylon material, diameter 1cm. The fishing tool designed by the present invention fully utilizes the principle of rising and falling tides of seawater, which greatly saves the fishing cost, which is a principle innovation. The present invention can not only be applied to fish fry fishing production, but also can be used in scientific research related to research on natural fish fry resources and habitats, which is an innovative application.

This embodiment seizes the key factor of maximally improving fishing efficiency and fry survival rate, and proceeds from the perspective of environmental protection, eco-friendliness, and high efficiency, and uses the principle of rising and falling tides in seawater to design an automatic fishing tool for natural fry at sea. The traditional fishing method not only has a large catch and low labor cost, but the whole set of fishing and transportation methods can greatly improve the survival rate of fry.

1. Fishing:

(1) In this example, the fishing time and location: the fishing time is from November to February of the next year, and the specific time varies with latitude. For example, the peak season of yellowfin roughy in the coast of Guangdong is from December to January. Fishing locations are chosen at the shoal where the salty and fresh water of the offshore estuary and the inner bay meet, where the bottom is gravel and the tide is obvious (such as Shuidong Bay in Maoming, Shapa Bay in Yangjiang and other sea areas). When the tide is low and the flow is slow, three natural fry fishing devices are arranged in a row, and they are fixed with wooden stakes to reduce the horizontal movement and deformation of the devices under the action of water flow, and reduce the impact on the fry fishing process.

(2) Each device uses a prism-shaped net as a fishing device. The net body is 10m long, the net mouth is 4m long, and 3m wide. The net sleeves on both sides are 6m long and 3m wide. The net sleeves on both sides are propped up with wooden stakes and ropes, and the net mouth is opened. When the tide ebbs, as the tide level decreases, the fry will enter the fishing device with the water flow.

(3) The opening at the narrower end of the fishing device is connected to a cylindrical cage. The cage is used as a fish collecting device, which can automatically gather the fish caught by the fishing device. Its diameter is 80cm, and its height is 1.5m. 6 lead weights are evenly distributed on the steel ring at the bottom of the tank, and 6 floating balls are evenly distributed on the middle and upper steel ring at a distance of 20 cm from the top steel ring, so that the part above the floating balls floats out of the water. The lower end of the fish-collecting device is connected with a sunk anchor with a rope to fix the device, so as to reduce its displacement and shaking and have adverse effects on fry. There is a rectangular opening between the floating ball and the bottom of the net cage, 40 cm long and 30 cm wide, which is connected to the opening at the narrower end of the fishing device.

(4) When the tide is approaching, use a small boat to reach the destination, slightly raise the rear of the fishing device, and scoop out the fry in the fish collection device for temporary breeding. If you want to transfer the position of setting the net, first put away the sinking anchor, take out the stake, and pull the pull rope connected to the net port of the fishing device on the top of the fish collecting device to quickly retract the whole device.

2. Temporary support:

1) Temporary maintenance in the living water tank: Select the collected fry, and select healthy fry with complete body surface and normal swimming. Temporarily raise the selected fish fry in the living water tank of the ship, and then dock the boat in a sea area with good water quality and gentle current near the fishing point, and the temporary raising time is not less than 1 day.

2) Temporary breeding in nursery tanks: Screen fry and then temporarily raise them in 500L nursery tanks with a temporary breeding density of 400-500 fish/tank. The seawater used should be similar in temperature, salinity and pH to the seawater in the fishing area. And use an aerator to continuously increase oxygen to ensure that the dissolved oxygen in the water is above 8mg/L. During the temporary breeding period, rotifers or egg yolks are fed, and the temporary breeding time is not less than 1 day.

3. Transportation:

1) Short-distance transportation: for short-distance transportation with a transportation time of less than 5 hours, the fry should be fasted for 1 day before transportation to allow the fry to empty their intestines, prevent the fry from being injured by strenuous activities during packaging and transportation, and prevent the fry from defecating or spitting out food during transportation Pollution of water quality. Use double-layer plastic oxygen bags to transport fish fry, inject 1/3 of the seawater in the holding area into each bag first, gently put the fry into the bag with water, then compress the film bag, exhaust the air in it, and use an oxygen machine to slowly Sufficient oxygen, fasten the mouth of the bag tightly after filling, and then put it into a foam box. Each foam box contains 4 bags, each bag holds 8,000-12,000 fish, and an appropriate amount of ice is placed at the bottom of the foam box to reduce the activity and metabolism of fry by cooling down, and prevent excessive oxygen consumption and water quality deterioration.

2) Long-distance transportation: For long-distance transportation with a transportation time of more than 5 hours, stop eating for 1 day before transportation, and use running water trucks to transport fish fry, 40,000-50,000 fish fry per cubic meter of water, the water used is the same as the temporary water, and the air pump is used to continuously Add oxygen, and add MS222 anesthetic agent into water 100 times, and use 1g MS222 per 500L of water to prevent the vigorous activities of fry from affecting the water quality. During transportation, the management personnel should pay attention to observe the dynamics and activities of the fry. If any fry are found to be dead, they should be fished out in time. Timely increase the amount of oxygenation or take measures to change the water.

4. Lower pond:

1) Fry in the oxygen bag: After the fry transported by the oxygen bag, after arriving at the destination, first put the oxygen bag in the fish pond where it is placed, and adapt for 10-15 minutes. Then untie the mouth of the bag, observe whether the fry activities in the bag are normal, if there is death, first fish out the dead fish out of the bag. Then inject twice as much pool water into the bag, so that the water temperature in the bag is basically the same as the pool water temperature, let the fry soak for 5-10 minutes, and then slowly pour the fish with water into the pond.

2) Fry in the running water truck: After the fry transported by the running water truck arrive at the destination, it is not advisable to put the fry into the pond immediately, otherwise the fry will die due to the difference in water temperature between the two places. First, measure whether the water temperature of the breeding pond is basically the same as that of the running water truck. If there is a large difference, adjust the water temperature of the breeding pond in time. Then put the fry into a basin or bucket first, take water from the pond and slowly add it to the basin or bucket, wait for the fry to adapt slowly, and then slowly pour the fish with water into the pond after 10 minutes.

In addition, it can be the replacement of fish species, and it can be the change of some links in the present invention, such as the fishing device changing from the truncated truncated shape to the circular truncated shape, and the fish collecting device changing from the cylindrical shape to the cuboid shape, etc.; it can also be the material of the material used Changes, such as changing the float to foam, changing the sinker to iron chains, etc.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A yellowfin roughy natural fry fishing device is characterized in that it comprises a fishing device and a fish collection device, and the fishing device is connected with the fish collection device. 2. A natural fishing device for yellowfin roughy seabream fry according to claim 1, characterized in that: said fishing device is a circular truncated net body with an opening on the left and right sides, and the opening at the narrower end is connected to the set. Fish device connected. 3. A yellowfin roughfish natural fish fry fishing device according to claim 2, characterized in that: said fishing device includes a net body (1), a net sleeve (2), a net sleeve rope (3), The stake (4), the net body (1) is made of four trapezoidal nets on the upper, lower, left and right sides; the net sleeve (2) consists of two rectangular nets, which are distributed on the left and right sides of the opening at the wider end Both sides; the net sleeve rope (3) includes the net sleeve upper end and the lower end rope, and the net sleeve is stretched into a rectangle; the wooden stake (4) is connected with the net sleeve rope, and the device can be fixed by inserting the wooden stake into the sea. 4. A natural fish fry fishing device for yellowfin roughy seabream according to claim 1, characterized in that: said fish collecting device is a cylindrical net cage, comprising a bottom steel ring (5), a middle and upper steel ring ( 6), top steel ring (7), side steel bar (8), bottom net (9), side net (10), pull rope (11), anchor rope (12), sinking anchor (13); The side steel bars (8) are connected to the bottom steel ring (5), the middle and upper steel ring (6), and the top steel ring (7), and the side steel bars (8) are symmetrically distributed from the bottom steel ring to the The top steel ring is clothed with side nets (10); the bottom steel ring (5) is fixed with the bottom net (9), and the pull rope (11) is connected from the top steel ring (7) to the fishing rod. Above the opening of the device, the anchor rope (12) is connected with the anchor (13). 5. A natural fish fry fishing device for yellowfin roughy seabream according to claim 4, characterized in that several sinkers (14) are evenly fixed on the steel ring (5) at the bottom, and there is a cross fixed inside the steel ring cross steel bars (15), and the middle and upper steel rings (6) evenly fix several floats (16). 6. A yellowfin roughy natural fish fry fishing device according to claim 5, characterized in that: one end of the anchor rope (12) is connected to the cross steel bar (15) of the steel ring (5) at the bottom, The other end links to each other with sinking anchor (13); An opening is connected with the opening of the narrower end of the fishing gear around the seam on the net clothing between the upper steel ring and the bottom steel ring. 7. utilize the fishing transportation method of yellowfin roughy seabream natural fry fishing device described in claim 6, it is characterized in that: comprise the following steps, S1. Fishing: Use this fishing device to fish, and you can use one or more fry fishing devices lined up as needed; S2. Temporary maintenance: Temporary maintenance in live water tanks or nursery tanks, nursery ponds and other equipment; S3. Transportation: short-distance transportation or long-distance transportation; S4. Lower pond: fry in the oxygen bag or in the running water wheel. 8. The method for catching and transporting yellowfin roughfish natural fish fry according to claim 7, characterized in that: in the step S1, the fishing time and location: during November-February of the next year, choose inshore estuaries and inner bays The shoal where salty and fresh water meet, the bottom is gravel, and the location where the tide is obvious. 9. The method for catching and transporting yellowfin roughy natural fish fry according to claim 7, characterized in that: in the step S2, the living water tank is temporarily raised: the collected fish fry are selected, and the body surface of the screen is complete and the swimming is normal healthy fry; temporarily raise the selected fry in the living water tank of the ship, and then dock the ship in a sea area with good water quality and gentle current near the fishing point, and the temporary raising time shall not be less than 1 day; Temporary breeding in nursery tanks: Screen fish fry and then temporarily raise them in a 500L nursery tank. The temporary breeding density is generally 500-2000 fish per tank, which can be adjusted appropriately depending on the size of the fry; the seawater used should be as close as possible to the water temperature and salinity of the fishing point , pH is similar, and using an aerator, the holding time is not less than 1 day. 10. The method for fishing and transporting yellowfin roughy natural fish fry according to claim 7, characterized in that: in the step S3, short-distance transport: short-distance transport with a transport time of less than 5 hours, and the fry stop eating for 1 day before transport, Use double-layer oxygen bags to transport fish fry, add 1/3 of the seawater in the temporary breeding area to the bag, fill it with oxygen, tie the bag tightly, and then pack it in a foam box, put an appropriate amount of ice cubes at the bottom of the box to cool down, and pack 4 bags in each box , 8000-12000 fry per bag; Long-distance transportation: For long-distance transportation with a transportation time of more than 5 hours, stop eating for 1 day before transportation, and use running water trucks to transport fish fry, 40,000-50,000 fish fry per cubic meter of water, the water used is the same as the temporary breeding water, and MS222 anesthetic is added to the water. Use 1g MS222 for 500L water and use the air pump to increase oxygen; In the step S4, the fish fry in the oxygen bag: after the fish fry transported by the oxygen bag reach the destination, first put the oxygen bag in the fish pond where it is put in, and adapt to it for 10-15 minutes; then untie the mouth of the bag, and then Inject doubled pool water into the bag so that the water temperature in the bag is basically the same as the pool water temperature, let the fry soak for 5-10 minutes and then slowly pour the fish with water into the pond; Fry in the running water truck: After the fry are transported by the running water truck, after arriving at the destination, first adjust the water temperature of the breeding pond to be similar to the water temperature of the running water truck, then put the fry into a basin or bucket first, and slowly add water from the pool to the basin or bucket After 10 minutes, the fry will slowly adapt to the fish, and then slowly pour the fish with water into the pond.