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Definition:
A trophic level of an organism is its position in a food chain.
Levels are numbered according to how far particular organisms are along the
chain from the primary producers [plants] at level 1, to herbivores (level 2),
to predators (level 3), to carnivores or top carnivores (level 4 or 5).
Fish at higher trophic levels are typically of higher economic value.
Source & ©:
Millennium Ecosystem Assessment
Figure 1.3. Decline in Trophic Level of Fisheries Catch Since
1950 
More:
Source & ©: Seowon university Energetics in
ecosystems
Related words: Food web
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