My last post was a desperate plea to my tagged sturgeon. “Come and see me, I miss you!” I lamented, and guess what, the guilt trip worked! Last week we spent three days gill netting Lake Sturgeon on the Gasconade River and captured 8 individuals. Six were new, but two were fish we had tagged last fall. Our first recaptures!
All jokes aside, as with every field trip, we learned something new. For instance, the fact that our first and only recaptures occurred on the Gasconade River provides more evidence that the Gasconade River is home to fewer Lake Sturgeon than the Osage River. The much smaller Gasconade may simply lack the space to support as many Lake Sturgeon as the Osage, or there may be other habitat factors that make the Osage River more desirable for sturgeon. Now that we have tagged almost 20 Lake Sturgeon in the Gasconade, we have a sufficient sample size to start comparing their movement and habitat selection to the 56 Lake Sturgeon that we tagged in the Osage. This comparison can help us learn how Lake Sturgeon respond to flow manipulations in the regulated Osage River by using the free flowing Gasconade River as a control.
This also provided a good opportunity to check and see how our fish were recovering from surgery. The first recaptured fish was the only fish we had captured on a trotline in the Gasconade River this past fall. The second fish was also tagged last fall but was captured both times using a gill net. The incision sites on both fish seemed to be healing well with no external signs of infection present.
If this blog is really a mysterious communication channel to Missouri River Lake Sturgeon, I’ll put it in writing that all of you should spawn this spring. And make sure you are as conspicuous as possible about it too. Lots of splashing on the rocks please.