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Drifting FADs are used in the Atlantic , Pacific and Indian Ocean ocean Purse Seine fisheries; over 1 million tons of tuna and over 100,000 tons of by-catch are caught in the vicinity of FADs each year. 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". The widespread use of FADs has shifted the pattern of fishery exploitation of tunas over the past 20 years, with more smaller tunas being caught now than previously when pelagic purse seiners predominantly targeted free-swimming schools of tuna. Their use has also caused concern as by-catch of this fishery includes several species of pelagic sharks belonging to declining populations. EXTERNAL LINKS
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