Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fish aggregating devices drift like oceanographic drifters in the
  near-surface currents of the Atlantic and Indian Oceans   Knowledge of ocean surface dynamics is crucial for oceanographic and climate
research. The satellite-tracked movements of hundreds of drifters deployed by
research and voluntary observing vessels provide high-frequency and
high-resolution information on near-surface currents around the globe.
Consequently, they constitute a major component of the Global Ocean Observing
System (GOOS). However, maintaining this array is costly and in some oceanic
regions such as the tropics, spatio-temporal coverage is limited. Here, we
demonstrate that the GPS-buoy equipped fish aggregating devices (FADs) used in
tropical tuna fisheries to increase fish catchability are also capable of
providing comparable near-surface current information. We analyzed millions of
position data collected between 2008 and 2014 from more than 15,000 FADs and
2,000 drifters, and combined this information with remotely-sensed near-surface
current data to demonstrate that the surface velocity components of FADs and
drifters are highly correlated in the Atlantic and Indian Oceans. While it was
noted that the subsurface structures of FADs (typically made of recycled
fishing nets) did slow them down relative to the drifters, particularly in the
Atlantic Ocean, this bias was measurable and could be accounted for in future
studies. Our findings show that the physical meteorological and oceanographic
data collected by fishermen could provide an invaluable source of information
to the GOOS. Furthermore, by forging closer collaborations with the fishing
industry and ensuring their contributions to global ocean databases are
properly acknowledged, there is significant scope to capture this data more
effectively.

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The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: math
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org