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.

Report from the ISIIS team

By Jessica Luo
Posted on June 17, 2016


We sampled for almost 6 hours today on the Bandon Line (offshore —> onshore). Overall, we saw higher fluorometry peaks, lower oxygen at depth (nearshore), and may also have sampled a bit of a freshwater lens coming off the Columbia River plume. We went a little bit further inshore of the actual line end, towards the 50 fathom line, at which we sampled very, very close to the bottom. We had a few technical issues with ISIIS, but nothing that the Shimada engineering crew couldn’t help us solve!

Environmental data from the undulating In Situ Ichthyoplankton Imaging System (ISIIS). The sampling occured from offshore to onshore so in the plots- offshore is to the left and onshore is to the right.
Mitrocoma cellularia

 

Within the biological data, we saw some very interesting features. First, there was a large, dense patch of mesopelagic (and other) fishes, on the offshore side of the transect, between 80-100 m. In about 6 minutes of sampling (~50 m^3), we saw over 30 larval fish — incredible!  These were mostly myctophids, (also called lanternfishes) and we even saw a couple frames where they were quite close to a doliolid nurse (see image here).

 

Bolinopsis sp.

 

 

We also saw some very striking vertical structuring, which were characterized by layers of small and large diatom chains, doliolids, filamentous marine snow (decay from the bloom), large ctenophores and siphonophores, and then more clumping marine snow. In addition, we went through another dense patch of shrimps and krill (near surface, and nearshore), and large gelatinous zooplankton including Mitrocoma cellularia and Bolinopsis sp.. Very great day for us, especially with the ichthyoplankton. Really validates that key second “I” in the ISIIS name.


Tagged: Prerecruit

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