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Conclusion: What is causing the trout population to go down?

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Conclusion: What is causing the trout population to go down?

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Sea Lamprey

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Could sea lamprey cause the trout population to decrease?

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Could sea lamprey cause the trout population to decrease?

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During the dissection, the female lamprey had a BUNCH of eggs. It was probably at least 10,000 so if they produce that much baby lamprey they could be the main cause of the trout population decreasing.

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Algae is a producer that gets eaten by other organisms

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No, nothing happened that we know of.

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Did something happen to Algae, Plankton, Microscopic Plants, or Grass?

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How much food do lake trout eat on a daily basis?

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How much food do lake trout eat on a daily basis?

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0.5 to 1.8 percent of body weight per day

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Food Web, Producers, Composers and Questions...

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Food Web, Producers, Composers and Questions...

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Trout fish eat smaller fish than their size, crayfish, shrimp, invertebrates, sculpin, rainbow smelt, chub, alewives, plankton.

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The prey that is at the bottom of the ocean eats plant, animal parts, and algae. The prey that big trouts eat eat planktons.

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The adult trout eat bigger fish and the baby trout or developing trout eat insects, and invertebrates.

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Trouts eat sculpin, rainbow smult, chub, and alewives. Trout also eat crayfish and shrimp at the bottom of the lake. All of these organisms are smaller than the trout.

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Did the prey grow to the point where it's too big for food?

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Did the prey grow to the point where it's too big for food?

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No, nothing like this happened around this time.

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Big trout eat fish

Small trout eat invertebrates, e.g insects.

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Did the water temp. go up, changing where food is?

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Did the water temp. go up, changing where food is?

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Yes, some fish have moved due to changing water temps.