Northwest Fisheries Science Center

Newportal Blog

A gateway to oceanographic adventures from the Newport Line and beyond

Blog on ocean conditions along the Newport Line and the northern CA Current.

Entering the Columbia River Plume

By Kelsey Swieca
June 23, 2016


This morning we entered the southern end of the Columbia River plume while sampling on the Tillamook line. Salinity values dropped to 28 psu at the surface in offshore waters.

Physonect siphonophore.

 

Tonight we made a decision to skip a transect and proceed to our northernmost transect off of Willapa Bay, Washington.  We then plan to head back down to the Columbia River Line where we will hopefully hit the plume closer to the source. If all goes well, we will spend a couple of days on this transect which allows for some fine-scale sampling of the plume fronts with ISIIS and the nets that we have aboard The goal is to run a few transects perpendicular to the plume to capture the influences it has on larval distributions.

Shell-less pteropod (Corolla sp.).

 

 

 

In the short ISIIS transect done on this line, we got some beautiful images today including a shell-less pteropod (Corolla sp.) and a Physonect siphonophore. Offshore at ~60 m depth, we passed through an incredibly dense ~2m thick aggregation of shrimp that we believe coincided with a large acoustic signal on the ships radar.

Here’s an image of 10 out of the 44 frames of the shrimp layer stitched together!

Tagged: Prerecruit

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