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The International Council for the Exploration of the Sea (ICES), which gives scientific advice on sustainable fishing, said that in recent years, mackerel has been overfished due to a lack of international quota agreements. As a result there is not a high enough rate of breeding to replace the volume being caught.
Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.