JP2007037472A - Collection method for quantitative counting of seaweeds, and fish and shellfish, and collecting net usable for the collection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collection method for quantitative counting of seaweeds and fish and shellfish to accurately evaluate a seaweed bed or a fish bank as a fishing ground. <P>SOLUTION: The collection method for the quantitative counting of the seaweeds 3 vegetating in the fish bank 2 and the fish and shellfish 4 thronging around them by using a collecting net 1 in a surrounding net structure surrounding and blocking the horizontal direction by the net and communicating in the upper and lower direction comprises surrounding the target fish bank 2 with the collecting net 1 at first, tying up the upper part of the collecting net 1 at the upper part of the fish bank 2 to form a bag shape, cutting and floating the seaweeds 3 vegetating in the fish bank 2 by cutting the roots or at the vicinities of the roots, and at last tying up the lower part of the collecting net 1 at a part lower than the floated seaweeds 3 so as to form a closed bag shape to confine the seaweeds 3 vegetating in the fish bank 2 and the fish and shellfish 4 thronging around them, and to quantitatively count the seaweeds 3 and the fish and shellfish 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a collection method for collecting seaweeds and seafood to be collected in the algae basin or fish reef and a collection net used for the collection method in order to evaluate the algae pond or fish reef as a fishing ground.

  In the present invention, “algae” means a plant where plants grow in the sea, that is, seaweeds, and “fish reef” means a place where marine animals, ie, seafood gather, and each of these places is formed naturally. Whether it is artificially formed or relies on artificial deposits. Moreover, since this invention is about the collection method as a means to evaluate the said seaweed field or a fish reef as a fishing ground, the artificial seaweed which acts as a seaweed to collect is also contained in a seaweed.

  The algae basin or fish reef as a fishing ground collects seafood in vegetation seaweeds (especially Honda walla) and constitutes a fishing ground. From this, it is possible to evaluate whether the seaweed or reef forms a good fishing ground by collecting the amount and type of seaweed vegetated on the seaweed or reef, and also the seafood collected in the seaweed. . The evaluation of the algae basin or fish reef is performed by, for example, visually or photographing seaweeds per unit area to identify the amount and type of seaweed per unit area, and from the evaluation per unit area, The whole was being evaluated. Patent Document 1 discloses a technique for saving the above-mentioned photography by using an underwater traveling video system.

  However, it is difficult to specify the amount and type of seafood collected in seaweed by visual observation, photography, or video photography. The amount and type of seafood collected in seaweed can be specified by actually collecting it. Specifically, as seen in Non-Patent Document 1, for example, seafood collected on seaweed is collected using a fishing method using a net. In addition, as seen in Non-Patent Document 2, a dedicated net (Japan Sea Area Fisheries Research Institute Type Solitette) woven for the purpose of collecting seafood collected in seaweeds or a submersible enclosure is used. In some cases. Furthermore, as seen in Non-Patent Document 3, in addition to using the usual fishing method, gill net fishing method, purse seine fishing method, squirrel net fishing method and bottom net fishing method are also used as methods for collecting seafood collected on seaweeds. .

JP 2002-058370 A Comprehensive research and project on artificial reefs along the coast of Niigata Prefecture (119 pages, Niigata Prefectural Fisheries Experiment Station, May 1985) Coastal fishery development and development project Guidelines for breeding grounds, flatfish and clams (pages 50-51, edited by the National Coastal Fisheries Promotion Association, 1996 edition) Coastal fishery development project supervised by the Fisheries Agency Breeding groundland development plan guidelines (p. 89-90, edited by the National Coastal Fisheries Promotion Association, 2000 edition)

  In photography and video shooting, it is possible to specify the amount and type of seaweed vegetation that grows on algae beds or fish reefs, but it is difficult to specify the amount and type of seafood collected in this seaweed. However, when identifying the amount and type of seafood collected in seaweed by collecting fishery products using conventional fishing methods using various nets, it is difficult to collect seaweed. It can not be identified. That is, in order to evaluate the seaweed or fish reef as a fishing ground, it was necessary to use both seaweed identification by photography and video photography and fish and shellfish identification by fishing methods using various conventional nets.

  Here, since various conventional nets used to collect seafood are originally manufactured for the purpose of collecting seafood, seaweeds vegetated on algae beds or fish reefs cannot be collected. As a result, it was necessary to use another means to identify seaweeds. Therefore, in order to accurately evaluate seaweed beds or fish reefs as fishing grounds using a net that can collect seaweeds together with seafood, we studied to develop a collection method aimed at quantitative counting of seaweeds and seafood. .

  Developed as a result of examination, the horizontal direction is enclosed by a net and closed, and a quantitative counting of seaweed and seafood to be collected on a seaweed basin or fish reef using a collection net of a fence net structure communicating in the vertical direction First, the target algae basin or fish reef is surrounded by a collection net, and the upper part of the collection net is wrapped in a bag shape above the algae basin or fish reef, and then the algae basin or fish reef. Seaweeds planted in seaweed beds or fish reefs by cutting and floating the seaweed to be planted at or near the roots and forming a bag with the bottom of the collection net closed below the last seaweed. It is a collection method for the purpose of quantitative counting of seaweed and seafood collected by trapping and collecting seafood to be collected in the bag-shaped collection net. In this case, the collection network may be surrounded from the upstream side of the ocean current with respect to the seaweed basin or fish reef.

  The characteristic of the collection method of the present invention is that the seaweed and seafood to be collected are confined in a closed bag-shaped collection net. From now on, instead of the above collection method, the horizontal direction and the upward direction are surrounded by a net and closed, and using a collection net with a throwing net structure that opens downward, seaweeds that are vegetated on seaweed beds or fish reefs and collected seafood This is a collection method for quantitative counting. First, the target algae basin or fish reef is covered with a collection net, and then the seaweed vegetated on the algae basin or fish reef is cut off at the root or near the roots and floated. The seaweed collected by trapping seaweed and seafood to be collected on the seaweed basin or fish reef by trapping the bottom of the collection net below the last floating seaweed into a closed bag shape. It may be a collection method for the purpose of quantitative counting of fish and seafood.

  Here, in the collection net of the fence net structure, the upper part of the collection net is bound by the string body lowered from the ship, and the closed bag-shaped collection net is collected on the ship by the string body. Moreover, it is good to collect | recover the collection net | network which closed the lower part of the collection net | network with the string body lowered | hung from the ship, and was made into the closed bag shape to a ship with the said string body also in the collection net | network of a fence net structure or a throwing net structure. When the position of the upper or lower part of the collection net to be bound by the string is specified, ring bodies are arranged side by side in the circumferential direction of the mesh corresponding to the upper or lower part, and the string body is inserted into the ring body. You may tie the upper part or the lower part of the net.

  The seaweeds may be cut at the roots or in the vicinity of the roots by inserting a hand from an openable and closable slit provided in the net of the collection net. In this case, the collection net to be used is a structure suitable for the collection method of the present invention, that is, a net provided with the openable and closable slits as described later. In addition, when the seaweed is long, the surface attached with the seaweed of the seaweed basin or the fish reef, for example, in the case of the fish reef, on the ceiling surface of the fish reef, put a sash attached to the lower edge of the netting, and A diving worker outside the collection net may cut the root or the vicinity of the root by inserting a hand from the lower edge of the net.

  As the net used in the collecting method of the present invention, various conventionally known nets can be used, but the net of the net is fine and the net of the net does not deform for the purpose of collecting seafood juveniles. A braided net is preferred. Accordingly, in the present invention, a dedicated collection network has been developed in which the above-mentioned mesh net is provided with a slit that can be opened and closed. In other words, we have developed a collection net that has a net structure that is enclosed by a mesh line in the horizontal direction and communicates in the vertical direction, and is provided with a slit that can be opened and closed. It is preferable that the netting of the collection net is openable and closable at both circumferential edges by fasteners. The fasteners provided at both ends of the mesh fabric in the circumferential direction may be made of metal or resin, but may be configured to be closed from the bottom to the top for the purpose of confining to the net without damaging the seaweed flying toward the sea. .

  Moreover, it is good also as a collection net | network of the net structure of the throwing net structure which closes a horizontal direction and an upper direction by surrounding with a net, and is open | released downward, Comprising: It is good also as a collection net | network which provided the openable / closable slit in the said net. In any net, the slit provided in the net is preferably opened and closed with a fastener. The fastener that opens and closes the slit provided in the mesh may be made of metal or resin. Also, a plurality of slits can be provided over the circumferential direction of the netting so that diving workers can efficiently cut the roots of the seaweed or near the roots, and each slit can be opened and closed independently by each fastener. preferable.

  The present invention collects seafood collected in the seaweed together with seaweed vegetated on the seaweed field or fish reef, and realizes quantitative counting of seaweed and seafood in the seaweed field or fish reef, thereby enabling the fishing ground As an effect, it is possible to accurately evaluate seaweed beds or fish reefs. This is an effect obtained by trapping and recovering seaweeds that float by cutting at or near the roots, and seafood collected by seaweeds in a bag-shaped collection net.

  In such a collecting method of the present invention, the collecting net is developed and surrounded with respect to the algae basin or the fish reef, first the upper part of the collecting net is bound, and then the root of the seaweed or the vicinity of the root is cut and floated, and this time. A procedure for collecting the bottom of the collection net and finally collecting the bag-like collection net is required. However, if the upper part or the lower part of the collection network is first bound by the string body lowered from the ship, the collection network can be easily collected, and the effect of improving the working efficiency in the collection method of the present invention can be obtained.

  Furthermore, by using a collection net made of a moji net with a slit that can be opened and closed in the net, it is possible to collect without taking seaweed and seafood, and the root or root of seaweed that requires work time. Make it possible to cut the vicinity easily and in a short time. As described above, the collection net formed of the netting net provided with the openable and closable slits in the netting has the effect of increasing the working efficiency in the collection method of the present invention.

  In addition, in the collection net of the fence net structure, the peripheral edges in the circumferential direction can be freely opened and closed with a fastener, thereby facilitating the work of expanding and surrounding the collection net with respect to the algae or fish reef, and in the collection method of the present invention. The effect of improving work efficiency is brought about.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a collection network 1 composed of a net of a fence net structure that is enclosed by a mesh 11 in the horizontal direction and communicates in the vertical direction, and FIGS. 2 to 8 are perspective views showing the procedure of the collection method of the present invention. 2 is a stage in which the folded collection net 1 is submerged in the sea, FIG. 3 is a stage in which the collection net 1 is expanded, FIG. 4 is a stage in which the reef 2 is surrounded by the collection net 1, and FIG. 6 is a stage where the upper part of the seaweed 3 is closed, FIG. 6 is a stage where the root of the seaweed 3 is cut by opening the slit 12, and FIG. FIG. 8 shows a stage in which the closed bag-shaped collection net 1 is pulled up and collected. For convenience of explanation, the float, sink, and stitches of the collection net 1 and the diving worker are not shown in FIG. 2 and the subsequent figures, and the slit of the net 11 is omitted in FIGS.

  In the collection method of the present invention, conventionally known various types of nets can be used as long as they are a net structure or a net structure that can be formed into a bag shape that encloses the seaweed or fish reef to be collected and encloses seaweed and seafood. However, in order to efficiently carry out the work at each stage of the collection method, particularly the work of cutting or floating the roots of seaweeds or the vicinity of the roots, as shown in FIG. It is desirable to use a dedicated collection network 1 made of a net with a fence net structure provided in 11.

  The collection net 1 of the present example is composed of a net of a rectangular net having a rectangular size that can surround the fish reef 2 (see FIG. 2 and the following) together with the seaweed 3 vegetated on the ceiling surface 21. The koji net has fine square stitches that are not easily deformed, and is suitable for collecting the seafood 4 to be collected according to the present invention, particularly infants. The collection net 1 has a plurality of floats 13 attached to the upper edge and a plurality of sinks 14 attached to the lower edge, as in various conventionally known nets. Thereby, the unfolded collection net 1 can maintain the vertical direction and can surround the fish reef 2 from the horizontal direction by bending in the circumferential direction. At this time, if the stitches of the collection net 1 are too small, the resistance when the collection net 1 is expanded and folded increases, so the lower limit of the stitches is set according to the size of the seafood to be collected, and is unnecessary. Try to avoid small stitches.

  The feature of the collection net 1 of this example is that both end edges in the circumferential direction can be opened and closed by fasteners 151 (in this example, illustrated by rows of elements arranged on both ends in the circumferential direction), and the mesh 11 is opened and closed by fasteners 121. This is because a plurality of free slits 12 are provided in the circumferential direction. The fasteners 151 at both ends in the circumferential direction are configured such that a pair of elements (claws or rails) are completely separated. After the fish reef 2 is surrounded from the horizontal direction, the sliders 152 are engaged with the elements at the lower ends. By pulling up, both edges in the circumferential direction are closed (see FIG. 4).

  The slits 12 that can be opened and closed by the fasteners 121 are configured to open and close in the vertical direction of the collection net 1, and in this example, nine rows are provided at equal intervals in the circumferential direction near the middle of the net 11 in the vertical direction. Each slit 12 can be opened by pulling up the slider 122 of the fastener 121 from below, and can be completely closed by pulling down the slider 122. As a result, after enclosing the reef 2 from the horizontal direction and tying the upper part of the collection net 1, a diving worker individually opens the slit 12 and inserts a hand, and the ceiling surface 21 of the reef 2 surrounded by the collection net 1. Cut the roots of the seaweed 3 vegetatively or near the roots and cut them.

  In addition, the collection net 1 of this example is provided with straps 16 and 16 at the center of the upper edge and the center of the lower edge so that it can be sunk in a state where it is folded upstream of the ocean current with respect to the fish reef 2. Further, a positioning ring 17 for tying the anchor rope 61 is provided at the same height as the tie strap 16 at the center of the upper edge. For example, the positioning ring 17 ties the anchor rope 61 extended from the chain 52 of the anchor 51 lowered from the ship 5 to suspend the collection network 1 with respect to the chain 52 so that the direction of the collection network 1 with respect to the ocean current is maintained. The net 1 is prevented from collapsing in the vertical direction.

  Although not shown in the drawings, the collection network composed of the grid network having the throwing net structure according to the present invention can also be made by the same configuration as the collection network composed of the fence network having the above-described enclosure network structure. In other words, the collection net made of the net structure of the throwing net structure has a configuration in which the upper part is confined from the beginning, so that the binding string is provided only at the center of the lower edge. Also, fasteners provided at both ends in the circumferential direction of the net are provided to initially open the net to reduce resistance when the fishing net is covered with the collection net. In addition, an openable and closable slit for inserting a hand by a diving worker and a positioning ring for linking an anchor rope can be provided in the same manner as a collecting net made of a fence net structure. Handling becomes convenient.

  Next, the procedure of the collection method using the collection network 1 composed of the throwing net structure will be described. As shown in FIG. 2, the collection net 1 is folded by tying the upper and lower edges with tie straps 16, 16, and submerged in the sea near the fish reef 2 to be collected. If the collection net 1 is left unfolded from the beginning, it will not only be difficult to sink into the sea, but it will not be able to surround the reef 2 to be collected well. For this reason, it is desirable to sink the collection network 1 in a folded state as in this example. Here, due to the action of the float 13 and the sink 14, the collection network 1 causes the lower edge to come into contact with the seabed 7 and assumes a substantially upright posture with respect to the seabed 7.

  In addition, the folded collection net 1 may be submerged upstream of the ocean current (see FIG. 2 and below, three thick arrows in the figure) with respect to the fish reef 2 to be collected. As a result, the collection net 1 unfolded by tying the straps 16 and 16 can be folded so as to surround the fish reef 2 by placing both ends in the circumferential direction on the ocean current, as shown in FIG. Enclosure of the fish reef 2 becomes easier. In this enclosing operation, the bottom edge is slid in contact with the seabed 7 by the action of the sink 14, and the flat collection net 1 perpendicular to the direction of the ocean current is rolled up against the reef 2. Become.

  At this time, the positioning ring 17 at the center of the upper edge of the collection net 1 and the chain 52 of the anchor 51 lowered from the ship 5 so that the circumferential center of the collection net 1 maintains the upstream position of the ocean current with respect to the fish reef 2. Are tied with the anchor rope 61. As a result, the collection network 1 can always keep the center in the circumferential direction upstream of the ocean current with respect to the fish reef 2, and in addition, the anchor rope 61 looks like lifting the collection network 1. The possibility of hanging down is reduced, and it is easy to perform various operations in addition to the enclosing operation.

  Next, as shown in FIG. 4, the collection net 1 that has been unfolded and has both circumferential edges wrapped around the fish reef is engaged and closed by fasteners 151 provided at the both edges. The collection net 1 of this example employs fasteners 151 that engage a pair of elements by moving a slider 152 (see FIG. 1) from the bottom to the top at both circumferential edges. From this, the seaweed 3 vegetated on the ceiling surface 21 of the fish reef 2 can be confined inside the collection net 1 that surrounds the seaweed 3 together with the fish reef 2 from the horizontal direction without being sandwiched by the fasteners 151. At this stage, the collection network 1 communicates in the vertical direction.

  As shown in FIG. 5, the collection net 1 that has been enclosed in the horizontal direction is wrapped in a rope (string body) 62 at the top of the collection net 1 that is above the seaweed 3, and is formed into a bag shape that opens only below. . The upper part of the collection net 1 that is actually bundled varies depending on the size and amount of the seaweed basin or fish reef to be collected and the seaweed vegetated on the algae basin or fish reef. It is good to tie up a part suitably. In this case, if the height of the collection network 1 is sufficiently high, for example, a ring body may be provided at a part away from the upper edge by a certain distance, and a specific upper portion of the collection network may be bound by a rope inserted through the ring body. Here, in the case of a collection net having a throwing net structure, the work of tying up the upper part is not necessary.

  The fish reef 2 is thus isolated from the outside by a bag-shaped collection net 1 whose upper part is closed. The seaweed 3 and the seafood 4 collected in the seaweed 3 are collected in the collection net 1. The child is confined. From this stage, the seaweed 3 is cut and separated from the ceiling surface 21 of the fish reef 2. Specifically, as shown in FIG. 6, a diving worker (not shown) selectively opens the fastener 121 of the slit 12 by raising and lowering the slider 122 (see FIG. 1). 1. Insert a hand inside 1 and cut or separate the roots of the seaweed 3 or the vicinity of the roots. In this way, the fish and shellfish 4 in which the fish reef 2 is confined from the collection net 1 isolated from the outside world by opening only the slit 12 selected by the submersible worker for a necessary time (= time for cutting and separating seaweeds). Minimize spillage.

  The seaweed 3 cut and separated from the ceiling surface 21 of the fish reef 2 floats by its own buoyancy and accumulates on the upper part of the closed collection net 1. At this time, most of the seafood 4 collected in the seaweed 3 attaches to the seaweed 3 as the seaweed 3 rises, and thus moves to the upper part of the closed collection net 1. As a result, all the seaweed 3 vegetated on the ceiling surface 21 of the fish reef 2 is cut, separated and floated, and the lower part of the collection net 1 is bound with a rope (string) 63 below the seaweed 3. When closed, as shown in FIG. 7, the seaweed 3 and the seafood 4 can be confined inside the closed bag-shaped collection net 1.

  Here, the rope 63 that ties the lower part of the collection net 1 is easier to handle than the rope 62 that ties the upper part, and it is easier to handle the net 11 by the diving worker. In addition, when the rope 63 is pulled down from the ship 5 as shown in FIG. 8 by tying the lower part of the collection network 1 using the rope 63 lowered from the ship 5, the seaweed 3 and the seafood are inside. The bag-shaped collection net 1 in which 4 is enclosed can be easily collected. Here, in this example, the collection net 1 is suspended by the anchor rope 61 until the lower portion of the collection net 1 is closed into a closed bag shape (see FIGS. 2 to 7). Even if the anchor rope 61 is removed at any stage, such as the stage where the upper part of the collection net 1 is wrapped (see FIG. 5) or the seaweed 3 is cut and separated (see FIG. 6) The anchor rope 61 may not be removed until the collection net 1 is finally pulled up and collected (see FIG. 8).

  For example, in the case of the collection net 1 having an enclosure structure, it is conceivable that the upper part is bound with a rope that is lowered from the ship. However, as apparent from FIG. 8, the collection net 1 is still connected to the net 11 below the lower part, and the net 11 serves as a resistance when the collection net 1 is pulled up. In order to balance the weight of the bag-like portion containing the seaweed 3 and seafood 4 and the net 11 that continues downward from the tied lower part, the rope 63 that ties the lower part is lowered from the ship 5, The collection net 1 may be pulled up around the lower part.

  The collected seaweed 3 and seafood 4 are removed from the collection net 1 by unraveling the upper and lower ropes 62 and 63 of the collected net 1 collected in this way, and the seaweed 3 and the seaweed 3 for evaluating the fish reef 2 and Quantitative counting of seafood 4 can be performed. As described above, the seaweed 3 and the seafood 4 collected by being enclosed in the closed bag-shaped collection net 1 are collected in the seaweed 3 as well as the seaweed 3 vegetated on the ceiling surface 21 of the fish reef 2. Therefore, the quantitative counting of the seaweed 3 and the seafood 4 is evaluated as a fishing ground for the fish reef 2 to be collected.

It is a front view of the collection net | network which consists of the net | network net | network of the surrounding net structure which blocks | closes and closes a horizontal direction with a net, and communicates in an up-down direction. It is a perspective view showing the step which sunk the folded collection net in the sea. It is a perspective view showing the stage which unfolded the collection net. It is a perspective view showing the stage which surrounds a fish reef by a collection net and closes it. It is a perspective view showing the step which bundled and closed the upper part of the collection net. It is a perspective view showing the step which has opened the slit and cut | disconnecting the root of seaweed. It is a perspective view showing the step which closed the lower part of the collection net below the seaweed which floated. It is a perspective view showing the step which pulls up and collects a closed bag-like collection net.

Explanation of symbols

1 Collection network
11 Net
12 Slit
121 Zipper for slit
122 Slider
13 Float
14 Seiko
151 Fasteners at both edges
152 Slider
16 Tie
17 Positioning Ring 2 Fish Reef
21 Ceiling 3 Seaweed 4 Seafood 5 Ship
51 錨
52 chain
61 Anchor rope
62 Rope around the top of the collection net
63 Rope that ties the bottom of the collection network 7 Seabed

Claims (9)

This is a collection method for the purpose of quantitative counting of seaweeds and seafood collected in seaweed beds or fish reefs using a collection net with a fence net structure that is surrounded by a mesh area in the horizontal direction and connected vertically. First, the target algae or fish reef is surrounded by a collection net, the upper part of the collection net is wrapped in a bag shape above the algae or fish reef, and then the seaweed planted on the algae or fish reef is rooted or rooted. Cut and float near the seaweed, and close the bottom of the collection net below the last seaweed to form a closed bag shape. Collection method for the purpose of quantitative counting of seaweeds and seafood collected by confining them in a net-shaped collection net. A collection method for the purpose of quantitative counting of seaweeds and seafood to be collected on seaweed beds or fish reefs by using a collection net with a throwing net structure that is closed and surrounded by netting in the horizontal and upper directions. First, cover the target algae basin or fish reef with a collection net, then cut the sea algae vegetated on the algae basin or fish reef at the root or near the root and float up, below the last algae By enclosing the bottom of the collection net in a closed bag shape, the seaweed and seafood to be collected in the collection net can be quantitatively counted by collecting the seaweed vegetated on the algae basin or fish reef and the seafood to be collected. The intended collection method. The collection net is used to quantitate the seaweed and seafood quantitative counts according to claim 1, wherein the upper part of the collection net is bound by a string lowered from the ship, and the closed bag-shaped collection net is collected on the ship by the string. The intended collection method. The collection net is used to tie the lower part of the collection net with a string lowered from the ship, and collect the closed bag-shaped collection net on the ship with the string body. Collection method for the purpose of quantitative counting. The seaweed according to any one of claims 1 and 2, wherein the seaweed cuts the root or the vicinity of the root by inserting a hand from an openable and closable slit provided in the net of the collection net. And a collection method for the purpose of quantitative counting of seafood. It is a fence net structure with a mesh structure that is enclosed by a mesh line in the horizontal direction and communicates in the vertical direction, and is intended for quantitative counting of seaweeds and seafoods that are provided with a slit that can be opened and closed in the mesh pattern. Collection net. The net is a collection net for the purpose of quantitative counting of seaweeds and seafood according to claim 6, wherein both ends of the circumferential direction can be freely opened and closed by fasteners. A horizontal net and upper direction surrounded by a net, closed, and opened in a downward direction. A netting structure with a slit that can be opened and closed in the net for the purpose of quantitative counting of seaweeds and seafood. A collection network. The collection net for the purpose of quantitatively counting seaweed and seafood according to any one of claims 6 to 8, wherein the slit is openable and closable by a fastener.

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