Depending on the size of the trawl net, it may be hauled by a small outboard-powered craft or a huge freezer (factory) trawler (See Fishing Vessels-Trawlers). Trawl nets can also be deployed and collected by hand or with winches or other motorized equipment, depending on their size.
The majority of trawl nets are still powered by oars or sails, but electric motors are now used as well. These come in two main types: outboard motors and inboard motors. Outboard motors are mounted on the outside of the vessel and provide more power than an inboard motor, which is housed within the hull of the boat. Both types of motor are easy to operate and maintain.
In addition to powering tools, outboard motors can also be used for trolling purposes. This is when you move the motor slowly back and forth across the surface of the water to catch fish hiding beneath the surface. Trolling is useful for catching larger species that might not be caught otherwise. It's important to select a location where there is a lot of activity at the bottom of the lake or ocean bed. This will make it easier to find many of those precious fish!
Finally, trolling motors are helpful when fishing at night or in shallow waters where you would need help keeping your position while trying to find those delicious fish.
Trawling is a type of fishing in which a trawl is actively dragged or pulled through the water behind one or more trawlers. Trawls are fishing nets that are dragged along the seafloor or in midwater at a specific depth. They can be hand-towed or mounted on a pole known as a dragger.
A trawler is a large fishing vessel designed to fish widely across a range of waters and species. Trawl fishing is done from open boats, usually with two large nets called trawls attached to cranes on either end. The boat drags one net beneath it while the other is raised up into the air.
Trawls were originally used to catch herring by Norwegian fishermen but are now mostly used to catch shrimp, swordfish, and tuna. A trawl net weighs around 2,000 pounds (907 kg) and can reach a length of 130 feet (40 m). It consists of a mesh bag opened and closed like a purse seine, but instead of being made from plastic or rubber, it is usually made from metal wire. Trawl fishing is considered safe for both humans and the environment because any fish caught would have been dead already when the net was drawn over them.
The word "trawler" comes from the Norwegian term trawleir, which means "dragnet house".
A trawl is the net used for trawling. It is formed of fine meshes of steel wire or rod, attached at each corner to a frame. The frame is then dragged through the water on the floor of a boat, catching everything it touches.
Trawls were originally used for fishing but now they are also used for scientific research (see Oceanography). They are very efficient at catching large quantities of fish in a short time.
The word "trawl" comes from French travailer meaning "to work hard" and Latin trahere meaning "to pull up".
Before trawlers came onto the scene, all commercial fishing was done with hand-line fishing methods. Fish were caught by fishermen using simple hooks and lines. Most often, a single fisherman would use a hook attached to a long pole known as a gaff. This method is still used today by fishermen who do not use motorized boats or gear because it is more effective at catching smaller-sized fish and those that live in deeper waters. Hand-lining also requires a high level of physical strength from the fisheman.
A windlass for anchors A notched wheel contacts the chain or rope's links. A trawl windlass is a similar equipment that holds or manipulates a commercial fishing vessel's trawl. The trawl is a large fishing net that is coiled around the windlass. During fishing operations, the fisherman either let out or heave-up the trawl. This causes more of the net to be unwound from the windlass and allows more fish to be caught.
There are two types of trawl windlasses: one for use with wire trawls and another for use with mesh trawls. Wire trawls are still used in small quantities but most modern trawls are now mesh nets. Mesh nets are easier to haul in and return to port; they also allow smaller-sized fish to pass through them. Winding up a trawl on a wooden windlass takes about eight men - one at each end of the windlass and five to wind the net.
The trawl windlass is mounted on the deck near the bow (front) of the boat. It usually consists of a horizontal wheel with notches for the chain or rope attached to the front of the trawl. As the wheel turns, it passes over a bight (loop) in the chain or rope and lifts it up into the air. More chain or rope is then fed in until all the loops are raised off the ground.
A trawl that spreads the net using oyster boards and is generally hauled by trawlers that handle the fish captured. Also called oyster trawl.
Oyster trawls were originally designed to catch salmon in ocean fisheries; however, they are now used for a wide variety of marine species. An oyster trawl has a net that is spread out by wooden frames called "oyster boards." As the trawl is pulled through the water, the oyster boards spread the net out to allow more fishing space. A fisherman uses hooks and lines to catch fish that fall into the net.
Oyster trawls are used in commercial fisheries to catch shellfish such as oysters and clams. In addition, they are used by conservation agencies to capture marine mammals. There are two main types of oyster trawls: dragger and scallop dredge. Draggers are most commonly found in coastal waters while scallop dredges are used in offshore fisheries.
Draggers use their weight to drag the net along the bottom creating a large area of disturbance where other fish will move away from the trawl net. This allows larger fish to pass through the trawl net unharmed.