6.) Populations can be harvested sustainably Flashcards
how to make harvest/earnings sustainable?
- take interest, not capital (only population growth)
- only take excess production to harvest a population indefinitely
is there a sustainable harvest at k?
no, the population must be harvested to reduce n below k, which then responds in more offspring, low mortality, faster growth
-take less than msy
Recruitment failure
when more of a population is harvested than there are, not enough new fish are produced
why is the population stable to the right of the curve?
-can handle minor miscalculations if over/under harvested, self-regulating.
what happens if k or msy fluctuates
-can lead to overfishing
Biological problems with MSY
- MSY is estimated with error
- assumes a constant k and MSY
- Risk of recruitment failure
- no such thing as a definite k or msy
economical problems with MSY
- MSY is a biological optimum
- bad for industry–max economic yield is the economic optimum
fisheries: ideal method of fishing
bio-economic equilibrium in fishing industry
- the intersection between cost of effort and MSY
- the point when cost of effort is high and catch is down, stock overfished