TWI862418B - Fish collecting box net and fixed net having the same - Google Patents

Abstract

The present invention proposes a fixed net, which has a sports field net, a connecting box net, a fish collecting box net, and two landing nets. The sports field net surrounds a sports field, the connecting box net is arranged at one end of the sports field net, one landing net connects the sports field net and the connecting box net, and the other landing net connects the connecting box net and the fish collecting box net. The fish collecting box net is arranged at one end of the connecting box net far away from the sports field net, and has an entrance, a fish catching surface, and an escape net portion. The entrance portion has a fish inlet, which faces the connecting box net. The fish catching surface is opposite to the entrance portion and is an arc surface, and protrudes away from the entrance portion. The escape net portion is arranged on the fish catching surface, and the mesh of the escape net portion is larger than the mesh of the fish catching surface. Juvenile fish can escape from the larger mesh of the escape net, so while catching fish, it can avoid extermination and promote sustainable development.

Description

Fish collecting box net and fixed net having the same

This work is about a kind of fishing gear, in particular a kind of fixed net.

Fixed nets are a general term for fishing gear that is fixedly set up for fishing. In fixed nets, there are usually four elements of blocking, attracting, compartmentalizing, and trapping as the basic characteristics of its operation. Generally speaking, fixed nets include the following areas: playground nets, landing nets, and cage nets. The entrance for fish is in the playground net, and sometimes a fence net is set at the entrance.

The wall net is used to block the fishway and induce the fish to enter the playground net from the entrance. The playground net surrounds a range and induces the fish to swim towards the landing net. The landing net connects the playground net and the cage net. The landing net is generally funnel-shaped, and the smaller opening is connected to the cage net, so that once the fish enters the cage net, it is difficult to escape from the landing net. The cage net functions as a trap and has the smallest mesh size, usually only about 1 inch 2 minutes. The series connection of the landing net and the cage net can be defined as a repeating unit, and the fixed net can have multiple of the aforementioned repeating units connected in series to increase the difficulty of the fish to escape. For a traditional fixed net in the form of a single-head double-fall net, two of the aforementioned repeating units will be connected in series on one side of the playground net.

With the rise of conservation awareness, for the sustainable development of the fishery, fishermen will pick out immature juvenile fish from the catch and release them back into the ocean during fishing operations. Although in coastal fish farms, fixed nets pay more attention to avoiding catching juvenile fish than other fishing methods, as mentioned above, the mesh of the cage net is very small, only about 3 cm, and such a small mesh will still cause many juvenile fish to be retained in the cage net. The fixed net can catch thousands or even tens of thousands of fish at a time. It is extremely labor-intensive and time-consuming to select juvenile fish one by one from so many fish and release them back to the ocean. In addition, the juvenile fish may be squeezed or injured or die due to other factors after being caught, or even be preyed on by other big fish in the cage net. It can be seen that it is necessary to find a new solution to solve the above problems.

The main purpose of this creation is to propose a fish collecting box net, which can capture fish schools while allowing smaller fish to escape from the fish collecting box net.

To achieve the above-mentioned purpose, the fish collecting cage net proposed in the invention comprises: an entrance portion, which is located at one end of the fish collecting cage net, and a fish inlet is formed at the entrance portion; a fish catching surface, which is located at the other end of the fish collecting cage net relative to the entrance portion, the fish catching surface is an arc surface, and the fish catching surface protrudes away from the entrance portion; and an escape net portion, which is arranged on the fish catching surface, and the mesh of the escape net portion is larger than the mesh of the fish catching surface.

To achieve the above-mentioned purpose, the invention also proposes a fixed net, which includes: A playground net, which surrounds a playground area, and the playground net has a playground entrance, which is connected to the playground area; A connecting box net, which is set at one end of the playground net and is located outside the playground area; A fish collecting box net as described above, which is set at one end of the connecting box net away from the playground net, and the fish entrance of the fish collecting box net faces the connecting box net; and Two landing nets, one of which connects the playground net and the connecting box net, and the other of which connects the connecting box net and the fish collecting box net.

Therefore, the advantage of this invention is that by setting an escape net on the fishing surface of the fish collecting box net, when the fishing boat is collecting the net, the fish school is concentrated on the fishing surface in the fish collecting box net. Because the mesh size of the escape net is larger than the size of the fishing surface, the smaller juvenile fish can pass through the mesh of the escape net and swim out of the fish collecting box net and then return to the sea. Compared with previous technologies, this invention can reduce the risk of juvenile fish being preyed upon by large fish in the fish collection box net by setting up an escape net. Moreover, when fish gather in a school, the juvenile fish can directly escape from the escape net, without having to wait until they are caught on board to be manually selected and thrown back into the ocean. This can reduce the chance of being squeezed and injured, and there is no need to worry about being out of the sea for too long. This can increase the survival rate of juvenile fish and contribute to the sustainable development of fishery resources.

As mentioned above, the fish collecting box net, wherein the escape net portion is rectangular, and the upper edge position of the escape net portion is lower than the upper edge position of the fish catching surface.

The fish collecting box net as described above further has a connecting portion, which connects the entrance portion and the fish catching surface, the mesh of the connecting portion is not larger than the mesh of the entrance portion, and the mesh of the connecting portion is not smaller than the mesh of the fish catching surface.

The fish collecting cage net as mentioned above, wherein the total mesh size of the escape net portion is between 65 mm and 85 mm.

The fish collecting cage net as described above further has a tunnel net portion, which surrounds to form a passage, the two opposite ends of the tunnel net portion include an inlet end and an outlet end, the passage connects the inlet end and the outlet end, the inlet end is connected to the periphery of the escape net portion, and the passage and the interior of the fish collecting cage net are interconnected through the escape net portion; and a safe net portion, which is connected to the outlet end of the tunnel net portion, the safe net portion has an internal space, which is formed inside the safe net portion; and a side opening, which penetrates and is formed on a side surface of the safe net portion; wherein the passage of the tunnel net portion and the internal space of the safe net portion are interconnected through the side opening.

In the fish collecting cage net as described above, the cross-sectional area of the channel of the tunnel net portion gradually decreases from the inlet end to the outlet end, and the lower edge of the channel at the outlet end is higher than the lower edge of the channel at the inlet end.

The fish collecting box net as mentioned above, wherein the total mesh size of the tunnel net portion is not greater than 36 mm.

As described above, the treasury net further has a top cover connected to the side surface of the treasury net, and the top cover is penetrated to form a top opening, and the top opening is connected to the internal space.

The fish collecting cage net as mentioned above, wherein the total mesh size of the net of the vault net is not more than 36 mm.

First, please refer to FIG. 1 . The present invention proposes a fixed net, which includes a playground net 10 , a fence net 20 , a connecting box net 30 , two landing nets, and a fish collecting box net 50 .

The playground net 10 surrounds a playground 11, and the playground 11 may have a length direction L, and the length direction L is parallel to the direction of the ocean current of the fishing ground set in the invention. In this embodiment, the playground net 10 may further have a playground opening 101, and one end of the wall net 20 is set at the location of the playground opening 101, and the other end extends outward to the outside of the playground 11. The wall net 20 is used to intercept fish swimming along the ocean current, so that the fish enter the playground 11 through the playground opening 101 of the playground net 10.

The connection box net 30 is disposed at one end of the sports field net 10 in the length direction L and is located outside the sports field area 11 .

The two landing nets include a first landing net 401 and a second landing net 402. The first landing net 401 connects the playground net 10 and the cage net 30, and the second landing net 402 connects the cage net 30 and the fish collecting cage net 50. Specifically, the first landing net 401 and the second landing net 402 have a landing net entrance 41 and a landing net exit 42, respectively. The landing net entrance 41 and the landing net exit 42 are located at opposite ends of each landing net. The size of the landing net entrance 41 is larger than the size of the landing net exit 42, and the lower edge of the landing net exit 42 is higher than the lower edge of the landing net entrance 41. The first access net 401 is connected to the playground net 10 at one end with a access net entrance 41 and is penetrated through the end of the connecting box net 30 facing the playground net 10 at one end with a access net exit 42. The playing field 11 of the playground net 10 and the interior of the connecting box net 30 are connected to each other through the first access net 401.

The fish collecting cage net 50 is disposed at one end of the connecting cage net 30 away from the playground net 10. The second landing net 402 is connected to one end of the connecting cage net 30 away from the playground net 10 with one end having a landing net entrance 41, and is penetrated into the fish collecting cage net 50 with one end having a landing net exit 42. The connecting cage net 30 and the fish collecting cage net 50 are interconnected through the second landing net 402.

In addition, specifically, the present embodiment is explained by taking the single-head double-drop type fixed net as shown in FIG1 as an example. In the single-head double-drop type fixed net, two landing nets are respectively connected in series with two box nets to form two repeating units (double drops), and the two repeating units are then connected in series to one end (single head) of the playground net 10 to form a series structure of the playground net 10-the first landing net 401-the connecting box net 30-the second landing net 402-the fish collecting box net 50, but this is not limited to this. The present invention can also be applied to fixed nets in the form of single-head single drop or double-head single drop.

Next, please refer to Figures 1 to 3, which are the first embodiment of the fish collecting cage net 50 of the present invention. Specifically, the fish collecting cage net 50 in this embodiment has an entrance 51, a fish catching surface 52, a connecting portion 53, and an escape net portion 54. The entrance 51 is located at one end of the fish collecting cage net 50, and a fish inlet 511 is formed at the entrance 51, and the fish inlet 511 faces the connecting cage net 30. In this embodiment, the second landing net 402 connecting the fish collecting cage net 50 and the connecting cage net 30 is penetrated through the fish inlet 511 with one end having a landing net outlet 42, and its landing net outlet 42 is located inside the fish collecting cage net 50.

The fish catching surface 52 is located at the other end of the fish collecting box net 50 relative to the entrance portion 51. The fish catching surface 52 is a curved surface and protrudes away from the entrance portion 51. The connecting portion 53 connects the entrance portion 51 and the fish catching surface 52. The mesh of the connecting portion 53 is not larger than the mesh of the entrance portion 51, and the mesh of the connecting portion 53 is not smaller than the mesh of the fish catching surface 52. Specifically, in the present embodiment, the mesh size of the entrance portion 51 is about 90 mm, the mesh size of the connecting portion 53 is about 45 mm, and the mesh size of the fish catching surface 52 is about 36 mm, but the present invention is not limited thereto.

The escape net 54 is disposed on the fishing surface 52. Specifically, the escape net 54 is located at one end of the fish collecting box net relative to the fish inlet 511, and the escape net 54 is located close to the upper edge of the fishing surface 52. In this embodiment, the escape net 54 is rectangular, and the upper edge of the escape net 54 is lower than the upper edge of the fishing surface 52, so that when the invention is set in a fishing ground, the escape net 54 is located below the sea level as a whole, but it is not limited thereto.

The mesh size of the escape net portion 54 is larger than the mesh size of the fish catching surface 52, and the overall mesh size of the escape net portion 54 is between 65 mm and 85 mm. In the present embodiment, the overall mesh size of the escape net portion 54 is 75 mm, but is not limited thereto.

Next, please refer to FIG. 4 . When a fishing boat uses the invention to harvest fish, it pulls up the bottom of the fish collecting box net 50 to drive the fish school to the position of the fish catching surface 52. In this way, the fish school will be guided to gather at the sea surface and swim to the fish catching surface 52. The smaller juvenile fish in the fish school can escape from the mesh of the escape net part 54 and leave the fish collecting box net 50. In contrast, the adult fish are larger in size and thus will remain in the fish collecting box net 50 and be caught by the fishing boat. However, the method of use is not limited to this. In the case where there is no fishing boat driving them, the juvenile fish can also leave the fish collecting box net 50 from the escape net part 54.

Next, please refer to FIG. 5 to FIG. 7 , which are a second embodiment of the fish collecting cage net 50 of the present invention, which further has a tunnel net portion 60 and a vault net portion 70 .

5 to 8, the opposite ends of the tunnel net 60 include an inlet end 61 and an outlet end 62, the inlet end 61 is connected to the periphery of the escape net 54, and the tunnel net 60 surrounds to form a channel, the channel connects the inlet end 61 and the outlet end 62, and the channel and the inside of the fish collecting cage net 50 are connected to each other through the escape net 54. The mesh size of the tunnel net 60 is not more than 36 mm, and in this embodiment, the mesh size of the tunnel net 60 is 18 mm, but it is not limited thereto.

In this embodiment, the cross-sectional area of the channel of the tunnel net portion 60 gradually decreases from the inlet end 61 to the outlet end 62, and the lower edge of the channel at the outlet end 62 is higher than the lower edge of the channel at the inlet end 61, thereby guiding the juvenile fish to concentrate and leave the channel from the outlet end 62, and the reduced outlet end 62 can also reduce the free juvenile fish and then reversely enter the channel of the tunnel net portion 60.

In addition, in this embodiment, the tunnel mesh 60 can be divided into a tunnel front section 60A and a tunnel rear section 60B, the entrance end 61 is located at the tunnel front section 60A, and the exit end 62 is located at the tunnel rear section 60B. When the present invention is set in a fishing ground, the tunnel front section 60A is completely submerged in the sea, and the upper edge of the tunnel rear section 60B is flush with the sea level, but the form of the tunnel mesh 60 is not limited to this. Further, as shown in FIG8, it is a schematic diagram of the exploded development of the tunnel mesh 60 in this embodiment, the tunnel front section 60A has a skylight sheet 601A, two side sheets 602A, and a bottom sheet 603A, and the tunnel rear section 60B also has a skylight sheet 601B, two side sheets 602B, and a bottom sheet 603B. After the combination is completed, the tunnel mesh 60 shown in FIG5 and FIG7 can be obtained. Compared to the tunnel rear section 60B, the two side pieces 602A and the bottom piece 603A of the tunnel front section 60A have protrusions at the location of the entrance end 61, thereby being able to be connected to the fish catching surface 52 of the fish collecting box net 50.

Next, please refer to Figures 5 to 7 and 9. The safe net 70 is connected to the exit end 62 of the tunnel net 60. The total mesh size of the safe net 70 is not more than 36 mm, and the total mesh size of the safe net 70 in this embodiment is 18 mm, but not limited thereto. The safe net 70 in this embodiment has a bottom surface 71, four side surfaces 72, and four top pieces 731. The bottom surface 71 is rectangular, and the four side surfaces 72 are respectively connected to the four sides of the bottom surface 71. The four top pieces 731 are respectively connected to the upper edges of the four side surfaces 72, and each top piece 731 is a trapezoid. Thereby, an internal space 74 is formed inside the safe net 70, that is, between the bottom surface 71, the four side surfaces 72, and the four top pieces 731.

A side opening 721 is formed through one side surface 72 of the safe net 70, and the exit end 62 of the tunnel net 60 is connected to the position of the side opening 721, whereby the passage of the tunnel net 60 and the inner space 74 of the safe net 70 are connected to each other through the side opening 721. Specifically, the side opening 721 is located near the upper edge of the safe net 70, whereby when the juvenile fish leaves the tunnel net 60 and enters the inner space 74 of the safe net 70, it will fall downward, and the chance of reversely entering the passage of the tunnel net 60 from the exit end 62 of the tunnel net 60 is reduced.

The top cover 73 is connected to the side surface 72 of the safe net 70, and a top opening 732 is formed through the top cover 73, and the top opening 732 is connected to the internal space 74, so that researchers can observe and study the juvenile fish in the internal space 74 of the safe net 70. Specifically, the top cover 73 in this embodiment is composed of four top pieces 731, and the upper and lower edges of the four top pieces 731 are together formed around a top opening 732, but the present invention is not limited thereto.

By setting up the tunnel net 60 and the vault net 70, the juvenile fish escaping from the fish collecting box net 50 can be gathered for the benefit of the researchers' analysis, and the top opening 732 of the vault net 70 can facilitate the researchers' observation. For example, the researchers can observe the number and economic value of the juvenile fish in the vault net 70 at each specific period, such as every week, to evaluate whether the fishery resources of the fishery need to be strengthened. If the researchers estimate that the fishery resources or economic value of the fishery are seriously damaged, then for the management of fishery resources, all operators in the fishery may be required to adopt the fish collecting box net 50 in the present invention to avoid the depletion of fishery resources.

Finally, please refer to FIG. 10 , which is another embodiment of the safe net section 70 of the present invention. In this embodiment, a smaller sub-safe net 80 can be arranged in the inner space 74 of the safe net section 70, and connected with another smaller sub-tunnel net 81, and the sub-tunnel net 81 is also arranged in the tunnel net section 60. Smaller juvenile fish can enter the sub-safe net 80 through the sub-tunnel net 81, while larger juvenile fish can enter the safe net section 70 but cannot enter the sub-safe net 80, thereby further separating the juvenile fish according to their body size, so as to facilitate the research and analysis of researchers, but the invention is not limited thereto.

The invention allows immature juvenile fish to leave the fish collecting box net 50 through the escape net part 54, without having to wait until they are caught and then manually selected and thrown back into the ocean, thereby reducing the time the juvenile fish leave the ocean, preventing them from being squeezed to death during catching, or being preyed on by other fish, shrimps, crabs, or seabirds when thrown back into the ocean, and increasing the survival rate of the juvenile fish when returning to the ocean. On the other hand, since the juvenile fish can escape from the fish collecting box net 50, the chance of the juvenile fish being preyed on by large fish, shrimps, crabs, or other creatures in the fish collecting box net 50 can also be reduced.

In summary, the present invention, by setting up the escape net part 54 and using a larger mesh, allows the juvenile fish to escape from the fish collecting box net 50, thereby protecting the marine ecology while catching the fish, avoiding the extinction of the fish school, and promoting the sustainable development of fishery resources. In addition, the present invention can further set up a tunnel net part 60 and a vault net part 70 to collect the juvenile fish escaping from the escape net part 54, so as to facilitate researchers to observe the data such as the species, size, and quantity of the juvenile fish in the fishery, thereby further analyzing the fishery resources of the fishery and understanding the ecological status and economic value of the fishery.

10: Sports net 101: Sports opening 11: Sports area 20: Wall net 30: Connection box net 401: First landing net 402: Second landing net 41: Landing net entrance 42: Landing net exit 50: Fish collection box net 51: Entrance 511: Fish inlet 52: Fish catching surface 53: Connection part 54: Escape net part 60: Tunnel net part 60A: Tunnel front section 60B: Tunnel back section 601A, 601B: Skylight piece 602A, 602B: Side piece 603A, 603B: Bottom piece 61: Entrance end 62: Exit end 70: Vault net part 71: Bottom surface 72: Side surface 721: Side opening 73: Top cover 731: Top sheet 732: Top opening 74: Internal space 80: Secondary vault net 81: Secondary tunnel net L: Length direction

Figure 1 is a schematic diagram of the appearance of the fixed net of the present invention. Figure 2 is a partial schematic diagram of the appearance of the first embodiment of the fish collecting box net of the present invention. Figure 3 is a schematic diagram of the unfolding of the fish catching surface of the first embodiment of the fish collecting box net of the present invention. Figure 4 is a schematic diagram of the use of the first embodiment of the fish collecting box net of the present invention. Figure 5 is a schematic diagram of the top view of the second embodiment of the fish collecting box net of the present invention. Figure 6 is a schematic diagram of the side view of the second embodiment of the fish collecting box net of the present invention. Figure 7 is a schematic diagram of the appearance of the channel net part and the vault net part of the present invention. Figure 8 is a schematic diagram of the decomposition and unfolding of the channel net part of the present invention. Figure 9 is a schematic diagram of the decomposition and unfolding of the vault net part of the present invention. Figure 10 is a schematic diagram of another embodiment of the vault net part of the present invention.

50: Fish collecting box net

51: Entrance

52: Fish Catch Noodles

53:Connection part

54: Escape from the Internet Department

Claims (10)

A fish collecting cage net comprises: an entrance portion, which is located at one end of the fish collecting cage net and a fish inlet is formed at the entrance portion; a fish catching surface, which is located at the other end of the fish collecting cage net relative to the entrance portion, the fish catching surface is a curved surface, and the fish catching surface protrudes away from the entrance portion; and an escape net portion, which is arranged on the fish catching surface, and the mesh of the escape net portion is larger than the mesh of the fish catching surface. The fish collecting cage net as described in claim 1, wherein: The escape net portion is rectangular, and the upper edge of the escape net portion is lower than the upper edge of the fish catching surface. The fish collecting cage net as described in claim 1 further comprises: A connecting portion connecting the entrance portion and the fish catching surface, the mesh of the connecting portion is not larger than the mesh of the entrance portion, and the mesh of the connecting portion is not smaller than the mesh of the fish catching surface. The fish collecting cage net as described in claim 1, wherein: The overall mesh size of the escape net portion is between 65 mm and 85 mm. The fish collecting cage net as described in any one of claims 1 to 4 further comprises: a tunnel net portion, which surrounds a passage, the two opposite ends of the tunnel net portion include an inlet end and an outlet end, the passage connects the inlet end and the outlet end, the inlet end is connected to the periphery of the escape net portion, and the passage and the interior of the fish collecting cage net are interconnected through the escape net portion; and a safe net portion, which is connected to the outlet end of the tunnel net portion, the safe net portion has: an internal space, which is formed inside the safe net portion; and a side opening, which penetrates and is formed on a side surface of the safe net portion; wherein the passage of the tunnel net portion and the internal space of the safe net portion are interconnected through the side opening. The fish collecting cage net as described in claim 5, wherein: The cross-sectional area of the channel of the tunnel net portion gradually decreases from the inlet end to the outlet end, and the lower edge of the channel at the outlet end is higher than the lower edge of the channel at the inlet end. A fish trap net as described in claim 5, wherein: The overall mesh size of the tunnel net is not greater than 36 mm. As described in claim 5, the treasury net part further has: A top cover connected to the side of the treasury net part, the top cover is penetrated to form a top opening, and the top opening is connected to the internal space. The fish trap net as described in claim 5, wherein: The total mesh size of the net of the vault net is not more than 36 mm. A fixed net, comprising: a playground net, which surrounds a playground area, the playground net having a playground entrance, the playground entrance connected to the playground area; a connecting box net, which is arranged at one end of the playground net and is located outside the playground area; a fish collecting box net as described in any one of claims 1 to 9, which is arranged at one end of the connecting box net away from the playground net, the fish inlet of the fish collecting box net facing the connecting box net; and two landing nets, one of which connects the playground net and the connecting box net, and the other of which connects the connecting box net and the fish collecting box net.

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