Sustainable Fisheries
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Questions and Answers

Which of the following best describes the reason for the collapse of the Northern Cod Fishery in 1992?

  • Overfishing due to trawling (correct)
  • Decrease in natural population growth
  • Lack of regulation despite quotas
  • Insufficient biomass in the 2000s

    • What was the estimated stock size of the Northern Cod Fishery in the past?

  • 2 million tons
  • 1 million tons
  • 1.2 million tons (correct)
  • 0.1 million tons

    • What is the estimated stock size of the Northern Cod Fishery currently?

  • 2 million tons
  • 0.5 million tons
  • 1.2 million tons
  • 0.1 million tons (correct)

    • What was the goal of modeling for sustainable harvesting?

    <p>To understand what determines whether or not a fishery is sustainable</p> Signup and view all the answers

    What should the harvest rate of a fishery match to ensure population replenishment?

    <p>What is coming into the population</p> Signup and view all the answers

    What can cause the population of a fishery to decrease significantly?

    <p>Over-harvesting</p> Signup and view all the answers

    What factors should be considered when developing a model for fish population dynamics?

    <p>Factors influencing population growth and capacity for growth</p> Signup and view all the answers

    What is the importance of constructing visual representations in modeling fish population dynamics?

    <p>To help others understand complex information</p> Signup and view all the answers

    What should be maintained to prevent population decline or unstable equilibrium in a fishery?

    <p>A happy stable equilibrium</p> Signup and view all the answers

    What can the model for fish population dynamics be applied to?

    <p>The Grand Banks and other fisheries</p> Signup and view all the answers

    True or false: The collapse of the Northern Cod Fishery was caused by trawling and the identification of spawning grounds.

    <p>True</p> Signup and view all the answers

    True or false: Canada attempted to regulate the fishery with entry quotas in 1977.

    <p>True</p> Signup and view all the answers

    True or false: The fishery completely collapsed despite the implementation of quotas.

    <p>True</p> Signup and view all the answers

    True or false: The estimated current biomass of the Northern Cod Fishery is higher than it was in the past.

    <p>False</p> Signup and view all the answers

    True or false: The Canadian government implemented quotas that were too high, causing the fishery to collapse.

    <p>True</p> Signup and view all the answers

    True or false: Natural variation does not affect the population's ability to handle harvesting.

    <p>False</p> Signup and view all the answers

    True or false: Over-harvesting can lead to a significant decrease in the population.

    <p>True</p> Signup and view all the answers

    True or false: A process-based model will be developed in the next lecture.

    <p>True</p> Signup and view all the answers

    True or false: The model for fish population dynamics can only be applied to the Grand Banks.

    <p>False</p> Signup and view all the answers

    True or false: Completing the workshop before the assignment is recommended.

    <p>True</p> Signup and view all the answers

    What are the limiting factors for natural populations?

    <p>Predation, environmental parameters, and crowding and competition</p> Signup and view all the answers

    What factors does the logistic model take into account for population growth?

    <p>The logistic model takes into account factors such as predation and competition that limit population growth.</p> Signup and view all the answers

    Why is it important to consider stochasticity in population modeling?

    <p>It is important to consider stochasticity or randomness in population growth because it affects the ability of populations to handle harvesting and can lead to unstable equilibrium.</p> Signup and view all the answers

    What are the challenges of managing fisheries sustainably?

    <p>The challenges of managing fisheries sustainably include a poor track record of human management and the need for a model that predicts the outcomes of sustainable harvesting.</p> Signup and view all the answers

    What is the relationship between population models and declining fisheries?

    <p>Population models can be applied to fisheries management and highlight the decline of fisheries worldwide.</p> Signup and view all the answers

    What was the cause of the Atlantic cod fishery collapse in the 1990s?

    <p>The Atlantic cod fishery collapse in the 1990s was caused by overfishing and the identification of spawning grounds.</p> Signup and view all the answers

    What is the purpose of developing a model for fish population dynamics?

    <p>The purpose is to understand and predict the population dynamics of fish in order to implement sustainable harvesting practices.</p> Signup and view all the answers

    What factors should be considered when developing a model for fish population dynamics?

    <p>Factors such as population growth, capacity for growth, and the impact of the living environment and reproduction on the population should be considered.</p> Signup and view all the answers

    What is the importance of constructing visual representations in modeling fish population dynamics?

    <p>Constructing visual representations helps others understand complex information and evaluate the robustness of theories.</p> Signup and view all the answers

    What is meant by maintaining a stable equilibrium in a fishery?

    <p>Maintaining a stable equilibrium means preventing population decline or unstable equilibrium and allowing for natural rectification from one year to the next.</p> Signup and view all the answers

    What can cause the population of a fishery to decrease significantly?

    <p>Over-harvesting can cause the population of a fishery to decrease significantly.</p> Signup and view all the answers

    What is the goal of sustainable harvesting?

    <p>Allow the population to fix itself and revert back to its original state, without crashing or slipping into an unstable environment.</p> Signup and view all the answers

    What are the two rules for sustainability harvesting?

    <p>The first rule is to maintain the population at a steady state and extract only what can be replenished. The second rule is to ensure that the population can sustain the goal of harvesting without causing decline.</p> Signup and view all the answers

    What are the four learning objectives of the expert summariser?

    <p>The first is to formulate a simple, general, process-based model for a math system. The second is to translate between verbal, conceptual, or graphical models and mathematical models. The third is to use theoretical modeling to assess how the system may respond to different circumstances. The final objective is to evaluate the robustness of regions from their theory.</p> Signup and view all the answers

    What is the importance of constructing visual representations in modeling fish population dynamics?

    <p>Visual representations help to understand and communicate complex concepts and relationships in a more intuitive way.</p> Signup and view all the answers

    What are the factors that should be considered when developing a model for fish population dynamics?

    <p>The model should take into account factors that influence population sizes and capacity for growth, such as recruitment, fishing pressure, and ecological interactions.</p> Signup and view all the answers

    What is the difference between a geometric model and a logistic model?

    <p>A geometric model describes population growth over time by the same amount or more or less the same proportion, while a logistic model describes natural systems where there are limits to population growth due to factors like environmental parameters, crowding, and competition.</p> Signup and view all the answers

    Why are geometric models used for compound interest?

    <p>Geometric models are used for compound interest because they describe population growth over time by the same amount or more or less the same proportion, which is similar to the way compound interest grows.</p> Signup and view all the answers

    What factors can limit population growth in a logistic model?

    <p>Factors like environmental parameters, crowding, and competition can limit population growth in a logistic model.</p> Signup and view all the answers

    What is the importance of considering variability in population modeling?

    <p>Variability is an inherent part of all natural systems and must be factored into population modeling to accurately represent real-world scenarios.</p> Signup and view all the answers

    What is the significance of the decline in fisheries?

    <p>The decline in fisheries indicates a problem with the system and affects community composition, associated ecological processes, and has negative economic impacts.</p> Signup and view all the answers

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