The ASMFC technical committee has no idea what is responsible for the decline, and they admit it. The fish are successfully spawning but something is going wrong between the time they hatch and the time they mature, the young ones are just disappearing. They were a commercially valuable species, but now the ASMFC has effectively shut down the commercial fishery. The stock has always been cyclical as far back as records go. If I recall correctly its a 20-year cycle.
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