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I would say it is a herbivore, because they would probably eat the algae in the pond, but some might be carnivores or omnivores, so your best bet is to just look online.
Algae covered the top of the pond. The pond was full of algae.
If the population of algae in a pond dies, what will happen to the population of fish that eat the algae?
Yes, it is because without any algae some living animals in the pond would die. Algae can be food for some creatures in the pond. If your pond is just for admiring and not for living creatures, no, it isn't because the algae will take over the pond and no living creature is in it to eat the algae.
In a pond, there is no possible way of keeping an algae-free pond with fish in it. You can choose one or the other- A pond with fish and some algae or a pond with no algae and no fish. The chemicals needed to kill ALL algae would kill the fish. I have a pond with around 20 koi. I use Green Clean. It is a white powder and it kills most of the algae when it hits it. I find that PondCare Algaefix also somewhat works.
What is the herbivore in the following food chain: algae → fish → herons?
algae
A limpet is a herbivore, and grazes on algae covered rocks.
you kill the algae
Neither. Algae is a plant, not an animal.
No
algae