How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

4

Explanation:

In the food chain that is presented there are four trophic levels. The first level is occupied by the phytoplankton, which is the producer, thus it is at level one on the energy pyramid. Second comes the shrimp, which is feeding on phytoplankton, but is prey upon by numerous other species, thus it is on the second level in the energy pyramid. In the third level of the energy pyramid we have the perch. It is a small carnivore, and it feeds upon the shrimp and many other small prey animals, but it is also preyed upon by many larger species. The pike and the osprey are occupying the fourth level in the energy pyramid. They are both predators, and they prey on on the likes of the perch and many other small fish and animals, but they are not at the top of the food chain, as they also have predators above them and prey on them.

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