A Comparison of Gill Tissue to Body Tissue for

A Comparison of Gill Tissue to Body Tissue for
Deep-Sea and Shallow-Water Mussel

                  Our topic is to see if there is a difference of the amount of gill tissue between shallow-water mussels and deep-sea mussels. For shallow-water mussels, their scientific name is Mytilus edulis. The deep-sea mussel’s scientific name is Bathymodiolus thermophilus. Shallow-water mussels eat by filter feeding. They suck in water and little plankton gets caught in the cilia on the gill tissue and the mussel starts eating. Also, when the tide goes out, they close their shell with water inside. For the deep-sea mussel, they are way down in the water where hydrothermal vents are. There is no light so plankton can’t survive. So, they use chemosynthesis. My testable research question is “Is there a difference between the amount of gill tissue in shallow water or deep-sea mussels.” My alternative hypothesis is that the shallow-water mussel will have more gill tissue than deep-sea mussel. My null hypothesis is that the shallow-water mussel will not have more gill tissue than the deep-sea mussel.

Materials and Methods

                  The items we used were 2 tweezers, lab scissors, calipers, and graduated cylinders. First, you have to measure the length of the mussel with the calipers. After, we put some water in the cylinders. Then, we opened the mussel with the lab scissor. We stabbed the opening of the mussel shell with the lab scissor and gently push the scissor down, and open the mussel with the pincher. After you opened the mussel, you find a bright brown gill tissue. Then, you gently lift it with your pincher and cut it off with the lab scissor. You do that on both sides and put it in the graduated cylinder. Then, you scrape everything off until it’s clean. When you’re done scraping, you put all the tissue in the other cylinder. We do this so we could get the volume of the gill tissue. We got our shallow water mussel by hand in the...