JPH09104532A - Live fish photographing duct separating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a live fish photographing duct in which rise of water currents can be restricted to securely photograph live fishes, and in which the live fishes can be carried without being damaged. SOLUTION: A photographing duct 1 to photograph live fishes F carried with water is provided with a live fish passage 3 in which currents separated from water through the photographing duct 1, and a bypass passage 4, and a slit member 5 comprising plural linear members 5 disposed parallel to each other at an entrance part of the bypass passage 4 to be extended in the water current direction, forming slits between them, where envelope surfaces of the linear members 5a are formed smooth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow dividing device for a live fish photographing duct used for an automatic live fish discriminating device or the like.

[0002]

2. Description of the Related Art As a photographing duct for photographing live fish transported together with water, a fish shadow can be effectively placed within the field of view of a camera which is a means for observing the body of live fish. As described above, it is necessary to provide a flow channel that is narrow enough to allow live fish to pass through. However, narrowing the flow channel increases the flow velocity, which interferes with imaging of live fish.

Therefore, in order to make the flow velocity in the photographing duct constant without increasing, it is conceivable to provide a bypass flow passage to divide the flow. In this case, it is conceivable to employ a diversion mechanism in which a grid-like net is provided at the entrance so that live fish is not sucked into the bypass flow passage side that diverts the flow, and the passage of live fish is restricted.

However, when the grid-like net and the fin of the live fish come into contact with each other, as shown in FIG. 4, if the diameter of the wire 9 of the net is smaller than the interval between the small bones 8 of the fin 7 of the live fish F, the fin 7 May get caught in the wire 9. In addition, in general, live fish are directed toward the upstream side of the water stream, and their fins are parallel to the water stream.
The probability that the fin will get caught in the wire increases.

This means that when a feature is extracted from the photographed shape of a live fish fin to discriminate a live fish (for example, sex discrimination), the feature cannot be correctly extracted due to the damage of the fin, and the discrimination accuracy is deteriorated. Or it becomes impossible to determine. Moreover, since the fins of live fish are damaged, the commercial value of live fish is reduced.

The present invention is intended to provide a diversion device for a live fish photographing duct that can solve the above problems.

[0007]

A flow dividing device for a live fish photographing duct according to the present invention is provided in a photographing duct for photographing live fish transferred together with water, and the water flowing in the photographing duct divides and flows through a live fish passage. And a bypass channel, and a slit member formed of a plurality of wire rods provided in an inlet portion of the bypass flow channel and arranged in parallel to each other and extending in a water flow direction to form a slit therebetween, and an envelope surface of the plurality of wire rods. Is formed into a smooth shape.

In the present invention, a part of the water flow flows through the bypass flow passage and bypasses the live fish passage of the photographing duct, so that the flow velocity of water in the live fish passage does not increase, and There is no obstacle to shooting.

Further, since the slit member is provided at the entrance of the bypass flow passage, live fish is not sucked into the bypass flow passage.

Moreover, the slit member is composed of a plurality of wire rods arranged in parallel with each other and extending in the direction of the water flow to form slits therebetween, and there is no wire rod intersecting with the water flow, and the fins of live fish are caught on the slit member. Never. Furthermore, the envelope surface of the plurality of wires of the slit member has a smooth shape, and live fish is smoothly transferred together with water into the live fish passage of the imaging duct.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The water stream and live fish will be described as flowing from left to right in FIG. 1, but in general, live fish have a habit of taking a posture facing the upstream of the water stream and swimming against the water stream. However, in the imaging duct 1, the live fish is pushed by the momentum of the water flow and moves backward while taking a posture toward the upstream side of the water flow.

Both ends of the photographing duct 1 arranged substantially horizontally are cylindrical so that they can be connected to live fish transfer hoses (not shown). Inside the central portion of the imaging duct 1, partition plates 2 and 2 arranged substantially horizontally with a space above and below are provided with a live fish passage 3 having a rectangular section and upper and lower bypass channels 4 and 4 having a rectangular section. Is formed, and the horizontal widths of the live fish passage passage 3 and the bypass passages 4 and 4 are equal. At each inlet of the bypass flow path 4 on the upstream side of the imaging duct 1, the outer wall of the imaging duct 1 and the upstream end surface of the partition plate 2 are connected, and the envelope surface has a smooth shape. As shown in FIG. 1A, a plurality of arc-shaped parallel-arranged wire rods 5a extending in the water flow direction are attached, and slit members 5 having slits in the water flow direction are provided between the wire rods 5a. . Furthermore, the upstream end surface of the partition plate 2 is slightly bent toward the outside as shown in the drawing.

The central portion where the live fish passage 3 and the bypass passages 4 and 4 are substantially equal to the cylindrical cross-sectional area of both ends so that the flow velocity in the photographing duct 1 is substantially uniform. It has a rectangular cross section with a cross-sectional area. Further, the side surface of the central portion of the imaging duct 1 is a wall surface of a transparent body so that fish shadows of live fish passing through the live fish passage 3 can be observed. Furthermore, in order that the fish shadow can be housed within the field of view of the camera which is the observation means, the vertical interval (height) between the partition plates 2 and 2 is such that the movement of the live fish F in the vertical direction is suppressed. The distance is slightly higher than the height of F. Further, the width of the slit formed by the plurality of wire rods 5a of the slit member 5 is sufficiently narrower than the width of the live fish F so that the live fish does not slip through the slit and enter the bypass flow paths 4 and 4, and It is made wider than the thickness.

In the present embodiment, as shown by the white arrow, a part of the water flowing into the photographing duct 1 is divided and flows into the live fish passage 3 and the bypass passages 4 and 4. . Since the total cross-sectional area of the live fish passage channel 3 and the bypass channels 4 and 4 is equal to the cross-sectional area of the cylindrical portions at both ends of the photographing duct 1 as described above, the flow velocity in the photographing duct 1 is The fish is kept substantially uniform, and the live fish F that has entered the live fish passage 3 can be reliably photographed as described below.

The live fish F flowing into the photographing duct 1 together with water is prevented from entering the bypass passages 4 and 4 by the slit member 5 and enters the live fish passage passage 3. Slit member 5
Since the spacing between the slits is wider than the fin thickness of the live fish F, when the live fish F passes through the slit member 5, the live fish F may be slit due to the turbulence of the water flow or the vertical movement of the live fish F itself. Even if the member 5 is contacted, only the fin will fit into the slit. At this time, since the slit member 5 does not have a wire material that intersects the flow direction like a lattice network,
The fins of the live fish F are not caught by the intersecting wire rods and are not damaged. Thereby, when the feature of the fin shape of the live fish is extracted in the live fish passage channel 3 to determine the live fish (for example, sex determination), the feature of the fin is correctly extracted and the determination accuracy can be improved. Moreover, since the fish body of the live fish F is not damaged, the commercial value of the live fish F is not impaired.

Furthermore, as shown in FIG. 1, the partition plate 2
Since the tip of the upstream side of B is smoothly bent, when the fin of the live fish F passes through the tip of the partition plate 2, the fin is not damaged by the tip of the partition plate 2.

A second embodiment of the present invention will be described with reference to FIG. Only the points different from the first embodiment of the present invention will be described below. The fixed position on the downstream side of the slit member 5 is behind the upstream end of the partition plate 2. Further, the interval between the slit members 5, 5 (the narrowest part having a throat shape) is made slightly wider than the body height of the live fish F excluding the fins. No bend is provided at the upstream end of the partition plate 2.

The other points of the present embodiment are the same as those of the first embodiment of the present invention, and the same members in FIG. 2 are designated by the same reference numerals as in FIG.

In this embodiment, it is possible to obtain the same actions and effects as those of the first embodiment of the present invention. Furthermore, since the positions of the slit member 5 and the partition plate 2 in the flow direction are overlapped, and the narrowest part of the slit members 5 and 5 is almost equal to the body height excluding the fins of the live fish, the live fish is the partition plate. It will pass through the center in the vertical direction between 2 and 2. Therefore, the fins of the live fish F are not brought into contact with the partition plates 2 and 2, and the fins are not deformed by the partition plate 2. Therefore, when the features of the fin shape are extracted to determine live fish (for example, sex determination), the features of the fin can be correctly extracted to improve the determination accuracy.

A third embodiment of the present invention will be described with reference to FIG.

The present embodiment differs from the first embodiment of the present invention in that the plurality of wire rods of the slit member 5 are not arcuate but straight when viewed from the front and the upstream side of the partition plate 2. No bends are provided at the ends, and there are no other differences, and the same members in FIG. 3 are designated by the same reference numerals as in FIG.

In the present embodiment, since the connecting surface between the slit member 5 and the partition plate 2 is not parallel to the water flow, the action and effect are slightly inferior to those of the first embodiment of the present invention. The same operation and effect as those of the first embodiment of the present invention can be obtained.

[0023]

As described above, according to the present invention, the live fish transferred together with water does not catch the fin on anything in the photographing duct, thus damaging the fin and impairing the characteristics of the fin shape. Since it is possible to pass through the photographing duct without using the fins, when the characteristics of the fins are extracted to identify live fish (for example, sex determination), the characteristics of the fins can be correctly extracted to improve the identification accuracy. Moreover, since the fish body is not damaged, the commercial value of live fish is not impaired.

Furthermore, since the water flowing in the photographing duct is divided into the live fish passage and the bypass duct, it is possible to suppress an increase in the flow velocity in the live fish passage, and to reliably photograph live fish. be able to.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and FIG.
1 is a partially cutaway front view thereof, FIG. 1B is a partially cutaway plan view thereof, and FIG. 1C is a sectional view taken along the line AA of FIG. 1A.

FIG. 2 shows a second embodiment of the present invention, and FIG.
2B is a partially cutaway front view thereof, FIG. 2B is a partially cutaway plan view thereof, and FIG. 2C is a sectional view taken along line BB of FIG. 2A.

FIG. 3 shows a third embodiment of the present invention, and FIG.
Is a partially cutaway front view thereof, FIG. 3 (b) is a partially broken plan view thereof, and FIG. 3 (c) is a sectional view taken along the line CC of FIG. 3 (a).

FIG. 4 is a schematic view showing a state in which a wire rod of a net is hooked on a small bone of a fin of live fish.

[Explanation of symbols]

 1 Photography Duct 2 Partition Plate 3 Live Fish Passage Channel 4 Bypass Flow Channel 5 Slit Member 5a Wire Rod F Live Fish 7 Fin 8 Small Bone 9 Wire Rod

Claims (1)

[Claims] 1. A live fish passage passage and a bypass passage, which are provided in a photographing duct for photographing live fish transferred together with water and in which the water flowing in the photographing duct flows in a divided manner, and an inlet portion of the bypass passage. A slit member formed of a plurality of wire rods arranged in parallel with each other and extending in the direction of the water flow to form a slit therebetween, wherein the envelope surface of the plurality of wire rods is formed in a smooth shape. Dividing device for live fish shooting duct.