Scallop dissection: Please observe your mussel before dissecting it. Try added some green water to the container containing your bivalve and see if it opens up its shell to feed. If you are lucky your animal may try to move and you will be able to see its
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| Scallop dissection:
Please observe your mussel before dissecting it. Try added some green water to the container containing your bivalve and see if it opens up its shell to feed. If you are lucky your animal may try to move and you will be able to see its foot. The Atlantic sea scallop (Placopecten magellanicus) is a bivalve mollusk that resides on the continental shelf of the Atlantic Ocean between Newfoundland and North Carolina. Scalops will normally grow one ring per year up until they reach their maximum size, however ecological factors such as temperature, etc. can affect growth and sometimes an unexpected warm period can lead to an additional ring being laid down. How old is your scallop? The two hard shells (also called valves) are attached by a muscular hinge called the adductor muscle The Bay Scallop is about 3 inches (8 cm) in diameter; other scallops can reach 8 inches (20 cm) in diameter. The shell is secreted by the mantle, which is a thin sheet of tissue located between the shell and the body. Scallops have many primitive eyes; they can only sense changed in light and motion, helping them to detect predators. When you are ready to dissect, add some alcohol to your dish. Then try to pry the edge of the scallop were the two halves of the shell meet. You should be able to see the large muscle holding the two shells together and carefully cut it. Unlike many other bivalves, they lack siphons. As water moves over the gills, food particles become trapped in mucus, which is then moved on to the moth. . Then, the food is digested in the digestive gland, an organ sometimes misleadingly labeled as a "liver",. The digestive gland envelops part of intestine, and the entire stomach. The intestine ( like that of many bivales), passes through the animal's heart. Obtain a photograph of the gills. Dissect out some gill material and then view it under high power. Try to locate the foot and visceral mass. Label one of these in another photograph. Try to find the pericardial cavity by carefully and slowly removing material that may be lying on top of it. If you can locate the pericardial cavity do so and try to find the heart within it. If you are successful, please share your results with your classmates and get some photographs, so I can use them next year in this manual.  
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