Fish
what is the blue revolution
the boom in aquaculture since 1980
when a population of fish with small traces of toxin or microplatics is eaten by big fish, then that population is eaten by bigger fish. This causes what process to occur.
bioaccumulation
the maximum number of fish that can be caught without long-term depetion is the
maximum sustainable yeild
3 main types of fisheries
artesinal, recreational, commercial
what makes a species desirable for aquaculture
resilient, fast growth, low-feed conversion ratio
what two factors determine where fish distribute
nutrients and primary productivity
what rugosity level is required for high abundance of fish
high rugosity
how many nautical miles offshore does the australian fishing zone start and finish
3-200
when revenue (money made) is greater than cost of fishing, this is the
maximum economic yield
a system that rears organisms in nature with no water being pumped in or out is called
open system
Does CPUE increase or decrease when abundance declines?
decrease
what 3 stakeholders or methods are used to collect information on fish stock sizes/ fish population?
fishers data (i.e. logbooks)
scientists data (onboard sampling, capture-recapture)
data from market place
why is total allowable catch commonly divided into quota units
stop people racing to catch fish
name given when a population has reached the maximum number of individuals that the environment can carry
carrying capacity
a system using sophisticated water filtration and treatment systems.
closed
what does CPUE (catch per unit effort) estimate
Abundance of the unit stock (population)
what does the lincoln index measure
fish populations/ stock size
species that physically interact with fishing vessels or fishing gear and are not usually kept by commercial fisheries is called
bycatch
identify an example of a major australian edible seafood EXPORT product
tuna (yellow or bluefin), swordfish, marlin, mahi-mahi, spanner crab, abalone, lobster
highly controlled systems to maximise production in minimal space are intentive or extensive
intensive
fishing hotspots are determined by
areas of high chorophyll-a generally resulting from upwellings
What causes Ciguatera poisoning
bioaccumulation of toxins
what is the principle for if management believe a decision has the potential to put the environment at risk but not enough scientific data has been collected to know with confidence the outcome of their decision
the precautionary principle
5 S's of food security
1. Succifient
2. Safe
3. Sustainable
4. Shock-proof
5. Sound
output pollution, biosecurity, waste removal and production of feed are all considered what in aquaculture
an issue!