Spot shrimp (Prawns) from 6 to 10 inches are harvested in May and June.  The season closes upon determination the state quota is filled.  Limit is 80 shrimp or 10 pounds per person. 

This is a highly prized trip, often booking a year or two out.  Spot shrimp only or a combo trip:  Shrimp and bottom fishing. 

Shrmping in the San Juans continues for months.  A wider variety of shrimp including Spot, Pink, and Coonstripe are available and can be combined with bottom fishing (Ling Cod/Greenling/Rockfish).  

More information on SHRIMP: The State of Washington, Department of Fish & Wildlife has excellent informtion, some is copied below.

Puget Sound Shrimp
More than 80 shrimp species inhabit Washington waters. Only seven species though, are regularly captured for consumption by sport harvesters. Almost all sport shrimp harvest takes place in Puget Sound or its connecting waters.All seven harvested species belong to the family Pandalidae, and share similar biology and life history. They are found primarily on or near the bottom, but make daily migrations through the water column in search of food. They have been found at depths greater than 1,000 feet, but are most frequently captured at depths of 30 to 300 feet.  A variety of fish prey on shrimp, including cod, lingcod, hake, flounder, halibut, dogfish, skates, and other bottom fish. .

Spot ShrimpSpot ShrimpSpot Shrimp