Question 2: Carefully cultured microorganisms in the hydroponic bed convert ________ to nitrates, and the plants are fertilized by the nitrates and phosphates.
Question 4: Top-level carnivores (most salmon species) depend on fish feed of which a portion is usually derived from wild caught fish (________, menhaden, etc.).
Question 5: Because most fish are ________, they occupy a higher place in the trophic chain and therefore only a tiny fraction of primary photosynthetic production (typically 1%) will be converted into harvest-able fish.
Question 7: However, the rate of water exchange can be reduced through ________, such as the incorporation of hydroponically grown plants (Corpron and Armstrong, 1983) and denitrification (Klas et al., 2006).
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