when do commercial fishing boats go out ?

They might be saving their 'days at sea' allowance so they can land more at a more profitable time of year.
 
Most Thames boats will be shellfishing when shrimping finishes. It's seasonal work, and relies mainly on the Dutch market. Low prices then they stay tied up, especially if diesel is expensive.
My experience with Wash fishing boats is that they can make great money for part of the year and nothing for the rest. The hungrier that they are the more they make when the other guys are in the pub.
 
In time to get to the area, Before the opening,
The numbers of fishing vessels having seriously declined.

Traditionally, Not until Monday morning,
 
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