Overexploitation Flashcards
examples of destruction and degradation of habitat
tropical hardwood - rainforest
reef fish - coral reefs
whale and dolphin order
artodactyla
baleen and toothed whales
mysticeti and odontoceti
how long were whales hunted for
100’s of years
why whales hunted
blubber fuel whale oil
baleen (whale bone) - horsewhips
meat - eaten or rendered into oil
when did whalinf begins
late 16th century
most popular whale to be hunted and why
right whale
rich in blubber, easy to catch, float when killed
why does the species hunted change
commercial extinction
whale characteristics associated with increased vulnerability to extinction
large home range low pop density large bodied animals - sexual maturity later few offspring long period of infant dependency
ICCAT
international commision for the conservation of Atlantic tuna
aqua culture
farming of fish, molluscs , aquatic plants, algae and other aquatic organisms
environmental costs of aqua culture
loss of mangroves - Thailand 17% to shrimp pond
pollution from effluent - faeces from stock, excess food , chemical treatments
increase in fishing - farmed species require high protein diet
fishmeal from lower value fish to boost growth
scarcity favours what
favours subsidised industrial fishing fleets which supply weather markets at the expense of small scale subsistence fishers
what contributes to depletion in fish stocks
misguided fishing subsidiaries
how much of world fish stocks are being overexploited
60 %
