Week 2

Thursday, October 29, 2009

Week 2

When I first looked at my aquarium this week, I could see that my plants were just as I left them. However, they did seem to have grown a little which I suppose is because I added a food pellet at the end of my observations last week. When I began my observations, the first thing I notice was how much bigger my nematodes had gotten some seemed to doubled in size. Furthermore, I discovered that I had mistaked their identity; what I have been calling nematodes are actually annelids. I have discovered there are two species of annelids living in my aquarium. One of which is pictured above the second picture down. I observed this organism pulling food into its mouth with appendages under its mouth. Its movement is very spastic. I also observed several euplotes through out the aquarium. It is the first picture from the top. Areas with more concentrated groups of euplotes were around the plants. There was a dead annelid in the bottom of my aquarium where the largest concentration of urocentrum were located and stayed located the entire time. There seem to be a hundred in that area. It is the third picture from the top. A lot of the rotifers were hanging out around the half dissolved food pellet; however, they could also be found around the plants and the dirt. My main observation for this week was that there seemed to be more of everything and they all seemed to be a little larger.