Environmental Engineering Reference
In-Depth Information
Fish farming
in cage
Trawler
fishing
Spotter airplane
Sonar
Purse-seine fishing
Trawl flap
Trawl
lines
Fish school
Trawl bag
Drift-net fishing
Long line fishing
Float
Buoy
lines with
hooks
Fish caught
by gills
Figure 10-22
Major commercial fishing methods used to harvest various marine species. These methods have
become so effective that many fish have become commercially extinct.
100
25
80
20
60
15
40
10
20
5
0
0
1950
1960
1970
1980
1990
2000
2010
1950
1960
1970
1980
1990
2000
2010
Year
Total World Fish Catch
Year
World Fish Catch per Person
Figure 10-23
Natural capital degradation:
world fish catch (left) and world fish catch per person (right),
1950-2002. The total catch and per capita catches since 1990 may be about 10% lower than shown here
because in 2000 it was discovered that China had been inflating its fish catches since 1990. (Data from UN
Food and Agriculture Organization and Worldwatch Institute)
