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As can be seen on the video, the tetras descend on the offered JBL PlanktonPur , which they eat greedily. They do not spit it out once, although they definitely never have eaten this food before. But actually this is not completely true: Most of the tetra species on-site were plankton eaters which feed on the available plankton. A large majority of the natural plankton in the rivers consists of copepods. Even when JBL PlanktonPur contains marine, arctic plankton, the tetras will not taste the difference in such a short time. Even a microscopic differentiation is only possible for experts! Now this explains them gobbling it up, even if the fish are tasting JBL food for the first time. But at least this way they were able to eat their fill for once!
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