In the given condition competition interaction is taking place.
Competition is a rivalry relationship between two or more organisms.
A competition between individual of same species (intra specific) is more serious as compared to intraspecific competition between individuals of different species as all the members in a interspecific competition have same basic requirements like food, water, light, space, mating and shelter. But this is true only when resources are limited.
Each species has a specific role within their niche.
According to Gause's principle, one of the species is to be eliminated, i.e., no two species can live in a same niche and hence one of them need to be eliminated. But in the given scenario two herbivorous species are living in the same niche and feeding on phytoplanktons may be due to sufficient availability of phytoplanktons.
And as soon as the resources (i.e., phytoplanktons) starts to finish, the fishes would compete with each other as a result the competitively inferior one will be eliminated eventually.
And if the resources is plenty of the two species neither may be eliminated and niche overlapping may affect the growth and development of the individual.
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