Due to the success in collecting the natural scallop spat, scallop farming rapidly spread in the Mutsu Bay of Aomori prefecture in the middle of the 1960s. We have been producing scallop farming net products since the middle of 1960s, delivering high performance in the market and now we have our own factory overseas as our main production base.
Scallop nets mainly have two types of shape such as square pyramid shaped net(square net) and cylindrical shaped net(Lantern net). We have got a number of patents and utility models which have derived from many years of our experience.

Square net

Square nets consist of a net cloth, steel frame and rope and is used for growing small scallop spats just after spat collection. Mesh sizes of net cloth varies such as 3mm ~ 12mm for raschel net cloth and 7.5mm ~ 15mm for knotted net cloth according to spat size.

Kasane Mouth

Kasane Mouth 1

HIROSE Mouth PAT No. 6027196

KASANE Mouth 2 PAT No. 6027196

Feature:Because of easy mouth opening/closing, the “Kasane” square nets can increase work productivity and cost cutting.

Yellow square net

Yellow colored net cloth

Green square net

Green colored net cloth

Black square net

Black net cloth

We can produce the scallop net products in any combination of frame, rope and mouth shape according to customer demands.

About the materials

1. Net cloth

  1. Producing PE monofilament threads by our original formula in-house
  2. Producing net cloths in-house
  3. Cutting net cloths by automatic cutting machines

Strict inspections are made for all the processes are inspected and then the accepted materials are sent to the assembly process.
We can meet customers’ demands by mesh size, color and width of net cloth etc.(Minimum order quantity requirement applied for special order products)

Raschel net cloth(enlarged)

“Raschel net cloth(enlarged)”

Knotted square net cloth enlarged

Knotted net cloth enlarged

Knotted net cloth enlarged

Knotted net cloth enlarged

2. Frame

  1. Standard item(using steel wires of standalized thickness and content ratio of raw materials etc.)
  2. Standard item(using PVC of standalized color and light resistance etc.)
  3. PVC dip coating of steel wire
  4. Cutting PVC dipped steel wire at the specified length~coating the edge by PVC coating~Molding→Finished

The standard square frame has square 35 centimeters on a side. We have various thickness of steel wires such as #12(2.7mm), #11(2.9mm), #10(3.1mm), #9.5(3.2mm), #8(4.0mm), #6(5.0mm), #5(5.5mm) and various colors such as blue, navy, green, pink, black etc.

3. Rope

We produce PE monofilaments in-house, cut them at specified length and then inspect them to assembly.

Our ropes are also suitable for ear hanging and hanging scallop nets and we can produce our ropes in any combination of color. (Minimum order quantity requirement applied for special order products)

Braid

Braid

New braid

New braid

Material refinements

Square frame

Square frames, a main material for square nets, use PVC coated steel wires. A square frame is made of an outer frame and two beams fixed in place. However, the square frames can be damaged by sea water due to the slippages between the outer frame and beams which causes the PVC coating coming off from steel wires.
So, we have been working on the following refinements for many years.

Frame without hollows and painted the edges

Frame without hollows and painted the edges

Refinement 1.Covering the edge with PVC coating for water proof and rust proof

PVC dipped edges

PVC dipped edges

Refinement 2.Preventing net cloth abrasions with no projections on the outer frame

V-shape

V-shape

Refinement 3. Preventing the coming off of PVC coating

Resin connection

Resin connection

Refinement 4.Eliminating the bending points on the square frame prevents the coming off of PVC coating which makes the square nets durable.

Heisei frame

Heisei frame

Refinement 5.A steel frame and beams are welded first and then coated all over with PVC, which makes the frame rust and water proof. Also, the smooth, uniform thickness of PVC coating does not tear the net cloth.

Xshaped frame

Xshaped frame

 

Net cloth

Setting a square frame on the net cloth in the right place by ①putting a mark at the center of net cloth and ②inserting the three lines on the net cloth.

A mark at the center of net cloth

Three lines on the bottom net cloth

Three lines on the bottom net cloth

Lantern net

Lantern nets have multi-story storage compartments which can moves scallops in/out quickly. The sylindrical lantern nets are suitable for large scallops as well as small scallops and they can be used for cropping excess scallops as well.
We can produce the lantern net in any diameter.(38cm, 40cm, 45cm, 50cm etc.)
We are always working on refinements such as the mouth opening for increasing work speed and the structure for preventing deformation of frames.

lantern net(whole)

Lantern net(whole)

Lantern net(with Kasane mouth)

Lantern net(with Kanane mouth)

Lantern net(with mouth twine)

Lantern net(with mouth twine)

Pocket net

Pocket nets are suiltable for farming large scallops after the intermediate culture phase.
Scallops can grow in a pocket indivisulally stress-free and the curtain shape prevents clashes with each other in the sea.

Pocket net(whole)

Pocket net(whole item)

Pocket net(enlarged)

Pocket net(enlarged)

Installation plan of scallop farming facilities in the sea

Installation plan of scallop farming facilities in the sea

Rubber rope

Usually, floats are used for floating the scallop farming facilities under the sea but the scallops in the nets can be easily damaged by sea waves which move the culture nets vertically. The rubber ropes absorb the vertical movements to stabilize the scallop nets in the sea.

Rubber rope

Rubber rope

Rubber rope, point-of-use enlarged

Rubber rope, point-of-use enlarged

Spat collection bag

Spat collection bags are used for collecting scallop spats in early srpring.

Spat collection bag

Spat collection bag

 

Maru-chochin (Spat sellection Bag)

Maru-chochins (Spat sellection Bag) are used for sellecting the grown spats by size to move spats to square or lantern nets.

Maru-chochin(Spat sellection Bag)

Maru-chochin(Spat sellection Bag)

 

Other scallop farming methods

Bottom culture ・・・ Scallops after interim culture stage are grown on the seafloor and then harvested a couple of years later.
Ear hanging・・・ A tiny hole is drilled in the left and right anterior ear of the scallop shells and then hanged on a rope.
The fishers choose the suitable methods according to the sea environment.

Other products

We are also producing and selling other products such as capture cages.

Oyster net

Oyster net