March 16, Homework.docx - Jacob Nilson March 16 Homework...

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Jacob Nilson March 16, Homework Ichthyology A difference in dams and lakes that is noticeable by anyone is the geography of the lake/reservoir. A lake will be roundish in shape and will have gently sloping banks. A reservoir will generally have steep walls from the river carving out the channel. The reservoir will also tend to be more elongate. The discharge from them is also different. A dam will discharge from the bottom, making the water cold and it will contain little nutrients and oxygen. A lake will discharge from the top and contain more nutrients and oxygen. Fish populations in lakes tend to be much more stable than in dams. This will be reflected in the level of management required to keep fish stocked. There is a large inflow into dams, as well as outflow. There is a small inflow in lakes, which reciprocates a small outflow. When a reservoir is created, there is a nutrient surplus. These nutrients come from the soil and vegetation that was there before the reservoir filled. This is called a trophic
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  • Spring '14
  • ChristopherHoagstrom

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