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Lecture 15

ENVS 1000U Lecture Notes - Lecture 15: Marine Stewardship Council, Food Security, Pacific Halibut

Course Code
ENVS 1000U
Mary Olaveson

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Lecture 15
Marine Fisheries and Aquaculture
What is the State of Marine Fisheries?
about 68% of global marine fisheries are still sustainably fished
about 31% are overfished
number of overfished fisheries has increased 3-fold since 1970s
major concern if these trends continue in future
Overfishing – Emptying the Oceans
oModern industrialized fishing practices are placing unprecedented pressure on
marine resources
oPredicted that populations of all oceans species we fish for today will collapse by
the year 2048
Several Factors Mask Declines
oIndustrialized fishing has depleted stocks
oGlobal catch has remained stable for the past 20 years
ofishing fleets travel longer distances to reach less-fished portions of the ocean
ofleets spend more time fishing and have been setting out more nets and lines,
increasing effort to catch the same number of fish
oimproved technologies: faster ships, sonar mapping, satellite navigation, thermal
sensing, aerial spotting
odata supplied to international monitoring agencies may be false
Modern Fishing has become Industrialized
oFactory Fishing = highly industrialized, huge vessels use powerful technologies
to capture fish in huge volumes
even process and freeze their catches while at sea
oDriftnets for schools of herring, sardines, mackerel, sharks
oLongline fishing for tuna and swordfish
oTrawling for pelagic fish and groundfish
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