Indirect Interaction With The Trout

My focal species, the trout, has a direct predator/prey interaction with both the shark and the ghost shrimp. In the shark and trout predation, the shark benefits by feeding upon my focal species, therefore, this form of predation is parasitism. On the other side, the trout eats the ghost shrimp. Therefore, the trout benefits at the expense of the ghost shrimp. Thus, this relationship is parasitic as well.
Moreover, the trout has an indirect interaction with the starfish. Both species compete for the ghost shrimp as food. Any increase in the starfish population will decrease the shared food resource, thus, the trout population will indirectly decrease due to less food. As a result, if the starfish population increases, the trout population