What a great week! Tons of field work in the mudflats last week and got to spend last Friday with all the fellow SeaGrant scholars at Beverly Beach. We went to the Newport Aquarium and I got to spend my birthday with friends while exploring Eugene. Bought my first wetsuit and plan on giving surfing a try this week! Please enjoy the photos below that show all the nifty native creatures of the Pacific Northwest coast. Also I highly recommend clicking on the Otter_Video link below. You won’t regret it!
Big ole eel
Wolf eel being fed
Hagfish are not exactly the best looking fish, but they are used as a fake eel skin in a lot of clothing
Baby Pacific octopus
Puffin’ puffin his chest
After successfully deploying 23 pit traps in the last week (one went missing), on the 7th we were able to check them after being open for 24 hours. The results were pleasing to see, as we did in fact have crabs of multiple species in all of our traps. Many sculpin were caught as well and were noted. The number of Hemigrapsus crabs seemed to increase as we got closer to shore and the number of Dungeness was less and more randomly distributed. We also found two strange looking crabs that turned out to be Pea crabs. As planned the size selection method worked in a fairly smooth manner. I say fairly, because the majority of the traps caught small crabs, but a few actually caught large crabs that we are unsure of as to how they managed to get in. (while molted soft enough to squeeze??). This will be repeated several more times as the summer continues on.
Here is a video of the Dungeness Crab GoPro footage that was shot a few weeks back. We believe the crab is exhibiting this behavior because he (it is a male) is trying to crack his own shell open so that he may begin molting. The video is sped up from 30fps to 120fps.
Pit trap in action
Removing the zip ties on a trap to access the catch.
Staghorn sculpins that were caught in the traps
The panoramic camera work is taking a bit longer than expected, mostly because some equipment we were thought to of had by now, has not arrived so that testing our design is not possible yet. I have been working with a few video editing softwares that allow panoramas to be made via stitching.
This weekend a trip up to The Gorge is being made. Will post pictures!
Week 2 has ended and I have to say that Oregon is becoming more and more homely. Friends are being made and new experiences are occurring. Early in the week, core samples were taken in order to capture mud shrimp. A core sample, to those of you unaware of what that is, is where you take a large metal tube and press it completely into the ground and then proceed to dig all of the sediment out and sift through it while for mud shrimp. To get the core into the ground you must stand on top of it and do the “shrimp dance” which consists of wobbling motions. Once the mud shrimp were captured we measured the carapace length, sexed them, and checked for the infestation of parasites. The parasites are definitely not the most appealing creatures to look at, but they are still very interesting.
The mudflats show no mercy to those who science.
Mid-week many bucket lids were purchased (24 total). The reasoning for this is that we began to build experimental pit traps that would be size selective for the capture of small Dungeness crabs. We made two different designs, one with a larger whole and steeper funnel, and the other with a smaller hole and more gradual funneling. To set these traps, you basically just dig a hole in the ground and place the bucket in and wait for the crabs to fall in. Some people around here call them the “Dodos of the sea”. This is not due to having a resemblance with birds, but because of their ease of capture. After setting the traps we decided to place GoPro cameras onto two of the traps to capture some footage and observe the crab’s interactions with the traps. I’ve taken a brief look at the footage and there is some interesting behavior to note. I will definitely be including some of the video in my next blog entry. Several crabs were captured overnight, as well as a few Staghorn Sculpins, and a lone jellyfish. The next step will be to build 24 traps in total, and set them out in various locations. I’m really looking forward to see how things will play out with the implementation of our traps.
Young Dungeness crab captured in the pit traps
It’s been only two weeks and I already feel like I’ve learned quite a lot. Being from a freshwater background, marine and estuarine has offered a new perspective. 8 more weeks to go!
It has been roughly 12 days since I departed on my 4 day cross-country road trip from Indiana to the coast of Oregon. Many sites were seen like Medicine Bow, Winnemucca Mountain, and Crater Lake. Taking the time to see such colossal structures really made me realize how small we are in the vastness of our own country, let alone the planet.
It took 35+ hours to get to Oregon, and I’ve only been here for roughly a week, but I already feel a sense of home here. For the next 9 weeks, to my understanding, I will be working with integrating different pit trap methods for the capture of juvenile Dungeness crabs (Cancer magister) as well as the utility of using underwater video to get quality quantitative data on fish and invertebrate use of US West Coast intertidal estuarine habitats. Working this week with the USDA under my mentors, I have been very fortunate to already be getting out into the field.
Dungeness Crab (Cancer magister) caught from pit trap
This week we drove 60 miles north to Netarts, OR and checked shell bags for colonization by shellfish. We also took water quality in areas that were bare (lacked vegetation) and areas with seagrass present. Closer by (Yaquina Bay), pit traps were set up for the capture of Dungeness crabs to quantify their morphometrics to create more accurate size selection in the future. To our delight, we managed to catch several crabs, along with a few mud shrimp.
Mud shrimp that was dug up with the traps
There is no doubt that the next 9 weeks will pass by quickly, a lot will be learned and a lot of great memories are to be made. With that I hope you continue to enjoy my blogging as the weeks go by. I’m lucky to call this beautiful city and state my home for the summer. Follow me on here or via twitter @Prechtelguy93