Explaining Various Types of Fish-Attracting Device
Received Date: Apr 07, 2021 / Accepted Date: Apr 21, 2021 / Published Date: Apr 28, 2021
A fish aggregating (or aggregation) device (FAD) is a man-made object that are used to attract ocean-going pelagic fish such as marlin, tuna, mahi-mahi (dolphin fish). They usually consist of the buoys or floats tethered to the ocean floor with concrete slabs. FADs attract the fish for numerous reasons that vary by the species. Fish move gracefully through the water. They use their powerful tails to push them forward in the water and their fins to steer. Many of the fishes are in live and swim with the large groups called schools. Traveling in a school helps to protect them from predators. Fish advances to swim in schools to better shelter themselves from predators, to improve their foraging and to swim more efficiently. Unlike shoaling, in which the fish merely swim loosely together, schooling essentials to coordinated body positions and integrated activity.
Keywords: Fish-Attracting Device; Ocean Floor; Pacific Islands; Fisherman
Fish tend to move around FADs in varying orbits, rather than enduring the stationary bottom of the buoys. Both the recreational and commercial fisheries used by the FADs. Before the FADs, commercial tuna fishing harbour used for the purse seining to target surface-visible aggregations of birds and dolphins, which were a reliable signal of the existence of tuna schools below. The demand for dolphin safe zone tuna was a driving force for FADs specifications. In the past, the people in the Pacific islands are used to bamboo rafts to make it easier to catch tuna that gathered below. Today, the FAD has made fishing much easier for the fisherman. Drifting FADs are not tethered to the bottom and can be manmade, or natural objects such as logs or driftwood.
FADs occupy a fixed location and attach to the sea bottom surface using a weight such as a concrete block place. A rope is made of floating synthetic materials such as polypropylene attaches to the mooring and in turn attaches to a buoy. The buoy can float at the surface (lasting 3-4 years) or lie subsurface to avoid detection and surface of the hazards such as weather and ship traffic areas. Subsurface FADs last longer with in the 5-6 years due to less wear and tear but it can be harder to locate areas. In some cases, the upper section of the rope is made up of metallic material from heavier than water metal chain so that if the buoy detaches from the rope, the rope sinks in water and thereby keep avoid by damage to passing ships who no longer use the buoy to avoid getting tangled in the rope. Smart FADs include sonar and GPS capabilities so that the operator can also work as remotely contact it via satellite to regulate the population under the FAD.
Some FADs are permanent structures while others are moveable in natural substance. The former is set mainly in deep waters levels and relocations are virtually impossible. Present experience shows that the expected the average life of a permanent FAD would be 2 to 3 years ranges. The mobile of the lighter structures can be moved to attract the fish to a particular point to catch it easily. Still others can be removed from the water levels during certain seasons when the fish are not in the area or when the weather is rough, e.g., monsoon. Two major categories of the FAD’s may be classified into two regions i.e., Artisanal, and Industrial types. Simple or advanced FADs are left for the drifting in deep waters to help an offshore area, artisanal, and industrial fleets catch big pelagic fish, mainly tuna.
Citation: Podapati S (2021) Explaining Various Types of Fish-Attracting Device. J Marine Sci Res Dev 11: 309. DOI: 10.4172/2155-9910.1000309
Copyright: © 2021 Podapati S. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricteduse, distribution and reproduction in any medium, provided the original author and source are credited.
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