My larvae are 60 microns now!
Today, Laura helped me screen my larvae through 60 micron and 48 micron screens. You can see the data for yourself here, but the majority of my larvae held on a 60 micron screen! Since there was really nothing in the 48 micron screens, I tossed out those samples. While I probably threw some slower-growing larvae down the drain, I also got rid of dead larvae that could possibly disrupt the healthier ones. Laura screened while I counted right away. A few things I learned:
- It’s much easier to count my larvae on a Sedgewick Rafter cell than in a well-plate
- Yesterday, I was classifying larvae as dead if they didn’t show any signs of movement (both through the water column and their innards). This is incorrect! Larvae area dead when the shells are empty. I don’t remember seeing any larvae like that yesterday, but I think it’s safe to say that those data points are not high-quality. I shouldn’t use those counts in any analysis.
- What I thought was a shell deformation was actually the larvae’s…butt?? It’s just a normal D-hinge larvae from a different angle! I realized this when I saw one of those weirdly-angled larvae do a few spings and flips, then start swimming in a way that was recognizable as a D-hinge
I also preserved larvae in the freezer and fed a mix of C.iso and Chagra since those were the most dense. It’s likely that I undercounted algal cells on the hemocytometer since there were so many! I was a little short on time so I also only counted three hemocytometer cells.
Another thing we noticecd when filling buckets is that the water in the heating reservoir had been sitting so long that the 1 micron filter was showing signs of being anoxic. We flushed the line and replenished the header a bit. Laura talked to Stuart, and they suggest draining the header tank tomorrow and flushing fresh seawater through that line so that it sits overnight. I would also have to make sure my water is heating overnight.
- Figure out which AVTECH is which
- Add to larval tanks and totes strategically
- Relabel on Dashboard/OA Monitor
- Relabel HOBO probe tags
- Finish counting and imaging Plates 2 and 3
- Flush header and lines
- Replenish with new seawater
- Start heating process
- Feed Joth’s scallops
- Feed oyster larvae
- Prepare tripours for Saturday screening
- Clean up Sealab