Michelle Rau

2014 Mouth of the Columbia River Deep Water Site and Shallow Water Site Monitoring Series Part 1 of 4: Dungeness Crab Sampling

Occasionally ANAMAR gets to participate in some pretty cool surveys. Our work along the Oregon coast in 2014 was definitely one of those projects that make our job seem like an adventure—a fun and exciting one complete with incredible scenery, a mixed bag of weather conditions, a great team of people, and whale sightings!

Management of dredged material and ODMDSs is a shared responsibility of EPA and USACE under the CWA and MPRSA. The overall objective of this monitoring program is to assess the extent and trends of environmental impacts from disposal of dredged sediments at the Mouth of the Columbia River Deep Water Site and Shallow Water Site (MCR DWS and SWS). In June and October 2014, scientists from ANAMAR and USACE Portland District, EPA Region 10, Marine Taxonomic Services, and the crew of the R/V Pacific Storm (owned by Oregon State University) conducted two surveys of the MCR DWS and SWS. The two surveys were designed to assess the status of the physical, chemical, and biological environment within previous, current, and future drop zones. The surveys were conducted using the R/V Pacific Storm, which allowed the team to stay on location for the duration of the two surveys. The June survey took 6 days to complete and the October survey took 4 days to complete.

This four-part blog series covers the different types of samples that were collected during the surveys and attempts to tell the story and capture the “cool” factor via photos. Part1 describes the Dungeness crab sampling effort that was part of the June survey. The team deployed and retrieved crab pots twice at 24 locations within the DWS and 12 locations within the SWS to assess the status of this commercially and recreationally important species. The data collected will help assess the crab population and abundance in these areas.

 

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We measured the carapace width and noted the sex of each crab.  We also inspected each crab and noted any that showed damage to the exoskeleton or signs of past infections.

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