Sustainable fisheries: allow breeding to continue
| English | Français |
|---|---|
| recruitment/rɪˈkruːtmənt/ | recruitment |
| fishing quota/ˈfɪʃɪŋ ˈkwəʊtə/ | fishing quota |
What would explain this observation?
- A catch limit can reduce removals, while mesh size changes which fish are caught. These measures address different parts of stock conservation.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Fish stocks must remain large enough for successful breeding if populations are to persist. Catching too many individuals can reduce later recruitment 补充量. Quotas limit the permitted catch. Suitable net mesh sizes allow smaller, often younger fish to escape and have an opportunity to breed before capture. The effect depends on species and gear.
- fishing quota 捕捞配额: A limit on permitted catch in a defined fishery; recruitment: Addition of surviving young fish to the model stock.
How can suitable mesh size help conserve a stock?
Conservation needs evidence about population trends, recruitment and actual removals. A quota alone does not guarantee sustainability if it is too high, ignored or combined with other pressures. Bigger mesh is not a universal solution for every species; bycatch and habitat effects also matter when information is supplied.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Conservation needs evidence about population trends, recruitment and actual removals. A quota alone does not guarantee sustainability if it is too high, ignored or combined with other pressures. Bigger mesh is not a universal solution for every species; bycatch and habitat effects also matter when information is supplied.
- Compare fictional stock records, catch limits and size distributions. Explain how the proposed measure changes breeding opportunity or removals, then evaluate monitoring and enforcement. No current numerical fishing regulation is inferred from a classroom example; use the prompt’s stated model values.
Which two habits make the investigation or model in this case more defensible?
Compare fictional stock records, catch limits and size distributions. Explain how the proposed measure changes breeding opportunity or removals, then evaluate monitoring and enforcement. No current numerical fishing regulation is inferred from a classroom example; use the prompt’s stated model values.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a closed model stock begins at 1,000 fish, gains 300 surviving recruits, loses 150 to other deaths and 200 to catch. Final stock = 950. A catch of 200 therefore does not maintain the starting stock under these particular assumptions. Changing recruitment changes the sustainable removal estimate.
A model stock starts at 800, gains 240 recruits and loses 100 to other deaths plus 180 caught. Find final stock. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A model stock starts at 800, gains 240 recruits and loses 100 to other deaths plus 180 caught. Find final stock.
The result is 760 fish. Known: a closed model stock begins at 1,000 fish, gains 300 surviving recruits, loses 150 to other deaths and 200 to catch. Final stock = 950. A catch of 200 therefore does not maintain the starting stock under these particular assumptions. Changing recruitment changes the sustainable removal estimate.
Check the conclusion and its limits
- A quota is a limit, not the number automatically caught. A fish escaping capture does not guarantee it survives to breed. Local disappearance and global extinction are different outcomes, and long-term recovery needs repeated evidence.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Any quota, regardless of size or enforcement, guarantees stock recovery. This claim is false: A quota is a limit, not the number automatically caught. A fish escaping capture does not guarantee it survives to breed. Local disappearance and global extinction are different outcomes, and long-term recovery needs repeated evidence.
Sustainable fisheries: allow breeding to continue: Conservation needs evidence about population trends, recruitment and actual removals. A quota alone does not guarantee sustainability if it is too high, ignored or combined with other pressures. Bigger mesh is not a universal solution for every species; bycatch and habitat effects also matter when information is supplied.
Any quota, regardless of size or enforcement, guarantees stock recovery.
A quota is a limit, not the number automatically caught. A fish escaping capture does not guarantee it survives to breed. Local disappearance and global extinction are different outcomes, and long-term recovery needs repeated evidence.
A limit on permitted catch in a defined fishery: write the technical term.
fishing quota means A limit on permitted catch in a defined fishery.