A fish aggregating (or aggregation) device (FAD) is a man-made object used to attract ocean going pelagic fish such as marlin, tuna and mahi-mahi (dolphin fish). They usually consist of buoys or floats tethered to the ocean floor with concrete blocks. It is suspected that fish congregate around them for navigational purposes. Fish tend to move around the FADs in orbits of differing dimensions, as opposed to remaining stationary underneath the buoys. They are deployed for use by both recreational and commercial fisheries and there are two types; surface FADs and midwater or subsurface FADs. Subsurface FADs last longer due to less wear and tear from surface tension, but have the disadvantage of being harder to locate. The pelagic zone is the part of the open sea or ocean comprising the water column, i. ... Genera Istiophorus Makaira Tetrapturus See text for species. ... A shoal of skipjack tuna Tuna are several species of ocean-dwelling fish in the family Scombridae, mostly in the genus Thunnus. ... Binomial name Coryphaena hippurus Linnaeus, 1758 The Mahi-mahi (Coryphaena hippurus), also known as dolphin fish or dorado, are a species of surface-dwelling fish found in tropical and subtropical waters. ... A sea lion on navigational buoy #14 in San Diego Harbor Green can #11 near the mouth of the Saugatuck river. ...
FADs are widely used in the Western Pacific purse seine fisheries. Many of the FADs deployed by the vessel contain sonar equipment and GPS receivers. A vessel can remotely contact a FAD, via satellite and look at the sonar readings to determine the size of a school of fish under the FAD. These are often referred to as "smart FADs". A seine is a large fishing net that hangs vertically in the water by attaching weights along the bottom edge and floats along the top. ...
FADs in Hawaii, USA
FADs in New South Wales, Australia
FADs in the Commonwealth of the Northern Mariana Islands, USA
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