Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
  • A01K73/00—Drawn nets
  • A01K73/02—Trawling nets
  • A01K73/04—Devices for spreading or positioning, e.g. control thereof
  • A01K73/045—Devices for spreading or positioning, e.g. control thereof for lateral sheering, e.g. trawl boards

Definitions

• the present invention relates to a trawl panel. More precisely, it relates to a trawl panel, which allows fishing on the seabed as well as pelagic fishing, or semi-pelagic fishing, during which the trawl net is taken off from the seabed, at a depth more or less great depending on the type of fishing.
• the invention further relates to a trawl panel which makes it possible to fish in cold waters, which may be partially frozen on the surface, as is the case, for example, for shrimp fishing in seas close to the Arctic Circle. .
• the objective of the present invention is to provide a trawl panel whose shape and structure do not compromise the proper functioning of the trawl assembly, even in unfavorable conditions of extreme cold, while also effective in ordinary fishing configurations, both on the bottom and in pelagic or semi-pelagic fishing conditions.
• the trawl panel which is the subject of the invention has, as is known per se (see for example the document FR 1 595 458), a general oval outline.
• - It comprises in the front part a pair of deflecting vanes, or “foils”, of curved shape, which provide on their rear edge a transverse slot authorizing and channeling the passage of water; - its wall is full over an area extending over at least its entire rear half;
• the foil located between this solid area and the most forward foil is provided on its concave face - said ventral - with a fixing means, or branch allowing it to be attached to a traction fungus of a fishing boat; - the opposite - so-called dorsal - face of the panel carries fixing means allowing it to be attached to the arm of a trawl.
• the cross section of the panel takes the form of a dihedron whose edge extends horizontally, substantially along its median longitudinal axis, and whose angle is open on the side of its dorsal side, this angle having a value included between 165 ° and 175 ° approximately, and preferably of the order of 172 °.
• Said solid wall area is also curved, its concavity, like that of the two foils, being directed on the same side, corresponding to the ventral face of the panel, all these curvatures being registered approximately according to cylinder portions of transverse axis and vertical;
• - H being the height of the panel, its full lower portion extends over a height (k) whose value is between 0.15 H and 0.19 H approximately;
• - Said branch has at least two possible attachment areas of warp offset in height, one located at its median longitudinal axis, the other slightly below the latter.
• FIG. 1 and 2 are views, respectively, of the dorsal side and the ventral side of the panel;
• FIGS. 3 and 4 are perspective views, respectively of the dorsal side and the ventral side of the panel;
• - Figure 5 is an end view (rear view) in perspective of the same panel;
• FIGS. 6 and 7 are schematic sectional views of the panel, along the transverse and longitudinal section planes respectively designated VI-VI and Vu-Vil of Figure 8;
• - Figure 8 is a schematic front view of the same panel
• FIG. 9 is a diagram illustrating a trawl fishery in which use is made of a pair of panels according to the invention.
• the trawl panel shown in the figures, referenced 1 has a face (la) called ventral and an opposite face (1b) called dorsal. This panel has a general oval shape.
• the panel shown in Figures 1 to 8 is a port panel, capable of ensuring the opening of the trawl pocket on its left side when towed by a fishing boat. This panel therefore corresponds to that designated 1A in FIG. 9, while in this figure the other panel, referenced 1B, is a starboard panel.
• the left and right panels are similar but have a reverse configuration, symmetrical to each other.
• the reference BP has designated a fishing boat which tows the trawl 9.
• the trawl 9 which consists of a net pocket shape, is towed by the BP boat which sails on the N surface of the water.
• the role of the two trawl panels 1A and 1B is to keep the pocket suitably open during fishing, thanks to the hydrodynamic effect linked to the advancement of the boat and to the friction of the water against the ventral faces of the panels.
• These panels are connected to the boat by cables 90A, 90B respectively called “warps”. They are connected by their dorsal side to the trawl 9 by lines 91A, respectively 91B, traditionally called “trawl arms”.
• the front edge - or leading edge - of the panel has been designated in FIGS. 1 and 2 by the reference 10, while its rear edge - or trailing edge is marked with the reference 11. These lower and upper edges are respectively designated 12 and 11.
• the radii of curvature of the leading and trailing edges are substantially smaller than those of the upper and lower edges.
• the lower edge 12 is lined with a series of adjacent removable soles 120. These are sliding shoes on the ground, capable of being changed when they are damaged or worn.
• the arched shape of the lower edge 12 facilitates the passage of obstacles that may be on the seabed, such as rocks in particular, limiting the risk of blockage.
• the length and the width of the panel have been designated by the references L and H respectively. Thereafter, we will call this width "height" means the vertical or approximately vertical position of the panel during use.
• the L / H ratio is between 1.3 and 1.5 approximately. It is preferably of the order of 1.4. This shape and this ratio make it possible to obtain a good compromise between the hydrodynamic drag of the panel and its ability to keep the trawl correctly open.
• the panel 1 is subdivided lengthwise into three zones, namely a rear zone 2, which extends over a little more than half of the panel, a zone front 4, and an intermediate zone 3. These three zones are themselves delimited, on the ventral face la, by high longitudinal 15 and low horizontal ribs 16.
• a median longitudinal rib 14 is also provided which extends substantially along a longitudinal median axis from the leading edge to the trailing edge of the panel.
• deflecting vanes, or foils constitute deflecting vanes, or foils, and the passage of the water in use can be done in interstices or transverse slots 30, respectively 40, which respectively separate parts 4 and 3 on the one hand and 3 and 2 on the other hand.
• j is between 0.12 and 0.15 H approximately and k between 0.15 and 0.19 H approximately.
• the foil 4 has a certain number of longitudinal ribs 40. Furthermore, on the side of the dorsal side (see FIG. 1), longitudinal ribs 20 and 30 respectively on portions 2 and 3.
• the foil 3 carries, on its ventral side, a system 7 allowing the attachment of the warp.
• This attachment system comprises two longitudinal parallel plates 71, respectively 70 which are offset in height.
• Plate 71 is located in the extension of the central rib 14, in the center line of the panel, while the other plate 70 is located slightly below the plate 71.
• openings 710 which allow the passage and the attachment of the end of the pulling surface of the panel.
• Such a system is usually called "branch".
• This panel therefore has two branches offset in height.
• the lower branch 70 is advantageously used for fishing on a shallow bottom which requires a very long spinning (3 to 5 times the water height approximately) for which there would otherwise be a problem of tilting the panel inwards , this tilting being in particular linked to the weight of the warps.
• the panel seen at the end, has the general shape of a very open angle dihedral a, the opening of which is directed towards the side of the back side lb of the panel. Its edge is located along a horizontal center line, corresponding to the rib 14.
• the value of the angle a is of the order of 172 degrees.
• attachment tabs 8 are fixed for the trawl arm.
• the panel In use, when the panel moves on the bottom, its soles 120 rubbing on the seabed F (see Figure 6) the panel has a natural tendency to move outward, that is to say towards the dorsal side - which corresponds to a direction of opening of the trawl - even if the fishing boat is moving at a low speed, even very low, which can be between 0 and 2 knots.
• a difficulty also arises when the boat hits a crust of ice, which makes it stop suddenly.
• the panel has a natural tendency to rise when restarted, and it gently returns to its normal working position, which is substantially vertical.
• the panel which is the subject of the invention thus makes it possible to work in good conditions, whatever the fishing situation with which we are dealing, both at low speed and at high speed.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Environmental Sciences (AREA)
• Animal Husbandry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Wing Frames And Configurations (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32893239

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (5)

• 2003
  • 2003-03-12 FR FR0303049A patent/FR2852200B1/fr not_active Expired - Fee Related
• 2004
  • 2004-03-11 WO PCT/FR2004/000576 patent/WO2004082375A1/fr not_active Application Discontinuation
  • 2004-03-11 CA CA002518670A patent/CA2518670A1/fr not_active Abandoned
  • 2004-03-11 EP EP04719485A patent/EP1603387A1/fr not_active Withdrawn
• 2005
  • 2005-09-22 IS IS8041A patent/IS8041A/is unknown
  • 2005-10-12 NO NO20054699A patent/NO20054699L/no not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events