The country's ministry of fisheries declared no direct mackerel fishing was allowed after 6 p.m.
An additional change affecting pelagic vessels is the introduction of a regulation halting fishing on Atlanto-Scandian herring south of 66 degrees north latitude, and limiting mackerel bycatch to no more than 10 percent of catches over each three-week period.
The ministry announced these measures were put into place due to heavy fishing on mackerel that cut into Iceland's self-imposed 112,000-metric-ton limit.
According to the ministry, Atlanto-Scandian herring cannot be fished without mackerel bycatch, so some mackerel quota needs to be held over to cover this.
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