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4 Marine conservationists are concerned that fish stocks in the sea are decreasing. Drastic
measures will have to be taken to stop the extinction of many fish species.
Fig. 5.1 shows a marine food web. Tuna are large carnivorous fish that are an important
human food. Dolphins may be caught in fishermen’s nets and die.
53 fishing boat
44 tuna dolphins
I<
trophic | small carnivorous 1‘
level fish squid
24 herbivorous fish zooplankton
photosynthetic /
1 algae growing rl
on reefs Pp
Fig. 5.1
(a) State the names given to trophic levels 1 and 3.
1 Producer
ateeneneeneenee
3 Secondary level consumer [2]
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