Some examples of hole mesh in the bottom of a square net for example purposes
These are nets that will usually encompass the entire “cage system” around the outside and underneath to protect the grower nets and the stock within from large predators such as seals and sea lions.
This larger mesh net can be seen in this photo hanging down from the corner of a 14-cage system along the outside corner of the walkway.
Barge Tarps are smaller than plankton tarps and are used to wrap the entire underside of a floating structure usually once it arrives at a new site. By wrapping it tightly and pumping out as much water as possible the living organisms will soon die of oxygen starvation and begin to rot and fall away from the barges hull. After a few weeks the tarp can be removed and the rotted dead fouling can be allowed to fall away and then the bottom of this float is effectively disinfected of organisms from another site that may possibly have harboured harmful pathogens or a virus that could otherwise cause problems to the new stock grown at this new site.
Plankton Tarps can range in size from 30’ – 40+’ deep x 220’ – 425’ long. These tarps made from relatively light weight nylon (tent like) fabrics reinforced with ropes and seatbelt webbing are used to encircle entire fish farm nets as they are suspended in the sea to create an impervious barrier through which harmful plankton cannot pass.
At Campbell River Netloft Ltd (CRN) we are experienced in the construction of all kinds of nets. Nets for Fish Farms primarily but also for many other uses from children’s play areas to themed indoor decorations to larger than life depictions of giant Douglas Fir trees and clouds used in the opening ceremonies for the Commonwealth Games in Victoria in 1994
Diagrams of nets, mort rings and their set-up and use, bottom designs of nets.
New net construction:
Sports Netting – for Golf Driving Ranges, Indoor Ball sport protection and containment, Individual backstops for puck shooting etc.
Paintball Range boundary nets from used mesh depending on availability. Small enough mesh that a paintball cannot pass through and yet relatively inexpensive because it is USED.
We have constructed a very large, very involved traditional aboriginal multi-winged and multi-part salmon trap net for a live salmon catch and tagging program. We have made specialized Beach Seines for a Government Hatchery broodstock capture program.
We have constructed very specific Bird-Net sets to cover irregularly shaped holding ponds and yet still be tight over the entire surface. Altered existing used nets into debris (Bark) catching bags for forestry log dumps where bundles of logs off trucks slide down rails into the sea. We have made cargo nets for Helicopter Shake Block Loggers and Tree Planters to fly seedlings high up on the hillsides to where the planters await.
We have built large circular nylon Tuna Nets for Mexico, smaller and less strong nets for tourists to swim in among sharks outside the net at a Caribbean resort and Barracuda proof semi-rigid plastic nets for Milkfish in Malaysia. If you can conceive it we can most likely build it with mesh of some sort.
Bark Catching Net made from recycled Fish Farm Net
This swinging wall of mesh sits in a hatchery tank typically and then the walls are worked around the tank like clock hands to eventually crowd the fish into a smaller and smaller area from which they are more easily removed.
Tank Crowder Seine net:
We also make large 1.2m – 1.8m diameter steel rings with mesh bags and lifting bridles attached that are used to recover morts from the bottoms of net pens without the use of a diver. Through special rigging of ropes and sometimes weights the job of Mort Recovery can be accomplished from the surface by hand or with the help of a mechanical capstan winch.
Sometimes a special recessed “Pit” in the center of the bottom of a net can aid in the placement of this ring and to ensure all morts are collected even when there is considerable tidal action. We can retrofit a “Pit” into any existing net and the same feature can also accommodate and automatic Lift-Up™ Mort recover System as well.
Large Mort Recovery Ring Before Deepening:
These also are kept in stock complete and ready to go usually and are an 18” diameter mild steel ring with a handle along one side and usually a Smolt-Mesh bag sewn into it.
For bio-security reasons it is common to have one of these nets for every netpen that you are growing fish in as divers will use this ring to recover dead fish that may have collected on the bottom of that particular net and then that Mort recovery Ring will stay with that net even though it gets disinfected after every use. This is a double protection to ensure there is no cross contamination if a problem arises in one pen it will not be transferred to the other by using the same Mort Recovery Ring. In keeping with this theme the diver and all his gear is thoroughly sprayed down with disinfectant as well before they even move on to the next net.
These are DIVER mort recovery rings with mesh bag. Divers will recover morts from each pen with one of these and there will be one for each net so there is no spread of disease between pens.
We make Dip-Nets for use in larger nets or tanks to the mesh specs and depth that you desire. We keep a stock of circular stainless steel heads on hand to be able to mount the mesh bag of your choice onto it. This completed Dip-Net Head in turn can be mounted commonly onto an aluminum “Pike Type” pole handle of the length that you chose as well.
Our heads are “Supported” with a second attachment point or brace that extends up the handle and is securely bolted in place once the approx 10 cm lag screw at the edge of the hoop has been screwed into the base of the handle. The actual “Hoop” opening is 16” – 18” diameter and this is capable of catching up to 20+ lb fish.
Bird-Nets are commonly used to protect fish or other livestock in pens, nets, tanks or ponds from flying predators that may be interested in eating the fish or what you are feeding them. We usually carry a couple of common sizes for this purpose but we are not limited to only a few. Mesh to stop birds from gorging on your Berry Crops, Berry Netting is also available.
Sweep Nets or Crowding Nets for handling the larger population of fish inside larger nets are something we build regularly.
These nets can be for very small fish in tanks with very fine 4mm mesh and vertical poles mounted in the ends for controlling it inside the tank up to very large Harvest Seines, 45m wide x 40m deep mesh panels complete with large corks along the topline and heavy leadline along the bottom. These nets typically require mechanical assistance in order to use them effectively.
We also make Grading Seines complete with Flexi-Panel™ plastic tube grading bars for selective size grading of larger populations of fish inside a net. The options for seine nets are many and varied so best to email your requirements and objectives in order to determine which would be best for you.
We build and repair large seine nets with or without Flexi-Panel grading panels installed. These grading panel allow the smaller fish through and the larger fish stay on the other side for earlier harvest or size grading. Panels are made in Scotland.
We make all ranges of sizes and shapes of nets for Fish Farms large and small. From small 1.8m diameter circular nets used inside hatchery tanks right up to very large 120m circumference x 30m deep Grow-Out Nets used for everything from Salmon to Tuna and even temporary Killer Whale holding.
All shapes are possible as well with square and circular shaped nets being the most common but we have also built triangular nets to maximize space in a small indoor breeding operation where tank space was minimal and there was a requirement for many separate holding areas.
Coned Bottom nets are also a common feature we build into our nets where concentrating morts or uneaten feed to some type of retrieval device is required.
Circular Farm Cage system:
14 – cage system, all nets in:
This farm net combines nylon mesh on top with Hybrid (Dyneema blend) mesh in all areas below 3m from the surface.