BIO 204 Lecture Notes - Lecture 3: Pseudofeces, Graduated Cylinder, Podcast
15 Dec 2018
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Dissecting scope - look at slightly bigger objects. Compound microscope - look at very small objects. Graduated cylinder - make sure to measure at the meniscus. Centrifuge - separate solutions based on density. Vernier calipers - measure something more precisely. Bivalves, like the blue mussel, eat seston through filter feeding. Pseudofeces = inorganic silt particles that have been separated from the food and expelled without going through digestive track. Previous study showed that mussels grow more when ingestion > food level. Undisturbed mussels in containers with food and seawater will feed and the water with algae will gradually clear. Feeding rate of mussels: (1) the rate of sea water clearing, and (2) using the length of the mussels" released pseudofeces. Minimize the handling of living organisms as much as possible. Prepare multiple 500 ml 28 ppt shellfish diet solution until there is 1l of solution, using the 500 ml graduated cylinder and 1 liter beaker .
