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Problem - which salmon is
better for the environment
44269
Fish meal fed or soy fed
Salmon - fish meal
Plankton = 80,000KJm-2yr-1
Small fish = 2,500kJm-2yr-1
Salmon=200kJm-2yr-1
Salmon - fed on soya
Soya = 50,000kJm-2yr-1
Salmon=7,000kJm-2yr-1
Pyramids of energy
Explanation of Energy Pyramid Shape Energy Pyramid
• Energy pyramids
show the flow from one trophic level to
the next in a community
• They are shaped like a pyramid
because as we move up trophic
levels, the majority of energy is lost
and only a small amount is passed
on to the next trophic level.
• The units of measurement for a
pyramid of energy is energy per unit
area per unit time (KJ m-2yr-1), which
is kilojoules per square meter per
year.
• Because so much energy is lost,
each level has to be smaller than the
next. The second trophic level
cannot be larger than the first
because organisms cannot create
energy. They can only transfer it
from one level to the next, rather
inefficiently.
Energy pyramid – Between 80-90% of the
energy is lost as you move up from one
trophic level to the next trophic level. The
amount of energy that is passed from one
level to the next depends on how efficiently
the organisms can capture and use the
energy from the trophic level below.
The first level should be labeled producers.
The next level is the primary consumers.
The third level is the secondary consumers.
The fourth level is the tertiary consumers

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A salmon problem

  • 1. Problem - which salmon is better for the environment 44269 Fish meal fed or soy fed
  • 2. Salmon - fish meal Plankton = 80,000KJm-2yr-1 Small fish = 2,500kJm-2yr-1 Salmon=200kJm-2yr-1
  • 3. Salmon - fed on soya Soya = 50,000kJm-2yr-1 Salmon=7,000kJm-2yr-1
  • 4. Pyramids of energy Explanation of Energy Pyramid Shape Energy Pyramid • Energy pyramids show the flow from one trophic level to the next in a community • They are shaped like a pyramid because as we move up trophic levels, the majority of energy is lost and only a small amount is passed on to the next trophic level. • The units of measurement for a pyramid of energy is energy per unit area per unit time (KJ m-2yr-1), which is kilojoules per square meter per year. • Because so much energy is lost, each level has to be smaller than the next. The second trophic level cannot be larger than the first because organisms cannot create energy. They can only transfer it from one level to the next, rather inefficiently. Energy pyramid – Between 80-90% of the energy is lost as you move up from one trophic level to the next trophic level. The amount of energy that is passed from one level to the next depends on how efficiently the organisms can capture and use the energy from the trophic level below. The first level should be labeled producers. The next level is the primary consumers. The third level is the secondary consumers. The fourth level is the tertiary consumers