SCIE5500 - Marine ecosystem processes - R Programming Report Writing - Assessment Answer

  Marine ecosystem processes  R Programming Report Writing 

Assessment Task:

Step 1: Fish growth Model

QUESTION A1: Implement a model for salmon growth 

Can you implement a model for salmon growth?

QUESTION A2: Implement a model for salmon growth including abiotic factors

Can you update your salmon model to include the influence of temperature in the cold waters of Norway in winter (average temperature of 6 degrees)?

QUESTION A3: Estimating growth rates per day and at different temperatures

Can you calculate how much (in percentage) your salmon grows per day throughout the entire runtime?

QUESTION A3.3: can you plot all the different temperature scenarios in one plot?

Step 2: Food consumption during fish growth

QUESTION 3: Food composition

Can you calculate? 

The specific energy content (SEC) of the fish feed	Answer
The fraction of energy content due to protein (Ep), fat (Ef), and carbohydrates (Ec).	Answer

 

QUESTION A4: Can you calculate Qg?

 

QUESTION A5: Can you calculate Qs?

QUESTION A6 and A7: Biochemical energy cost and faecal loss

Can you calculate?

BC based on the fraction of energy content in protein, fat and carbohydrates?	Answer
The non-assimilated fractions of energy content due to protein, fat and carbohydrates?	Answer

 

QUESTION A8: Solving the equation for Qr

Can you solve the equation for Qr?

 

QUESTION A9: Estimate total energy consumed

Can you now estimate Qr (total energy in the food consumed) similar to the way you estimated the fish weight earlier?

 

Step 3: Estimate the food conversion ratio (FCRt)

QUESTION A10: Food conversion ratio

Can you now calculate and plot the FCRt as a function of the fish weigh?

QUESTION A10.1: Different food compositions

Can you compare the FCRt results you obtained with those for the following two food compositions?

1.  45% protein, 30% fat and 7% carbohydrates

2.  35% protein, 40% fat and 7% carbohydrates

Step 4: Retention of energy (ER)

QUESTION A11: Plot energy retention

Can you calculate and plot the energy retention for each food composition?

Step 5: Retention of protein by the fish (R)

QUESTION A12: Plot retention of protein

Can you calculate and plot the protein retention by the fish for each food composition?

Step 6: Integrated demands of food to produce a fish of a certain weight

QUESTION A13: Calculations

Can you calculate the total demands of food to produce a fish of a certain weight according to different food compositions?

QUESTION B1: Emission of ammonia by 1000 kg of fish

Can you now estimate the emission of ammonia from 1000 kg of fish of different individual weight (> 50 g) for each of the temperatures: 6, 9, 12, 15 and 18?

 

Step 8: Emissions of phosphate

QUESTION B2: Emission of phosphorus by 1000 kg of fish

Can you now estimate the emission of phosphorus from 1000 kg of fish of different individual weight (> 50 g) for each of the temperatures: 6, 9, 12, 15 and 18?

Step 9: Oxygen consumption

QUESTION B3: Oxygen consumption due to respiration

Can you now estimate the oxygen consumption from 1000 kg of fish of different individual weight (> 50 g) for each of the temperatures: 6, 9, 12, 15 and 18?

Step 10: Flow of matter to and from bottom

QUESTION B4: In this step, you will be required to search for information on how to calculate:

Faecal mass loss, food loss, and total oxygen demand by faeces.

LAST STEP: Start linking different parts of a larger model

QUESTION B5: Link nitrification and ammonia excretion Can you now link both models?

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