21. One aspect of trophic levels is called tritrophic interaction. 22. The trophic level of a fish is the position it occupies on the food chain. 23. For a systematic treatment of biodiversity within a trophic level , see unified neutral theory of biodiversity. 24. In addition, fish at higher trophic levels and fish with high fat content accumulate more contaminants. 25. Since animals are higher on the trophic level , they are less efficient sources of food energy. 26. Furthermore, the ten percent law shows the inefficiency of energy capture at each successive trophic level . 27. The pyramid then proceeds through the various trophic levels to the apex predators at the top. 28. Another example widely studied in aquatic and marine systems is trophic level decline in food webs. 29. There is also pyramid of numbers which represent the number of organisms in each trophic level . 30. It has led to disturbance of marine food web or trophic level and reduces marine biodiversity.
