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Many freshwater fish eat zooplankton, particularly when they are young. Freshwater drum do so as juveniles, while pond smelt feed on zooplankton through juvenile and adult stages. Coho salmon also eat plankton during their freshwater youth, but later migrate to the ocean. What a fish eats therefore depends on its species, age, and where it is in its life cycle.
Freshwater fish that eat zooplankton
These examples show why it helps to compare fish by life stage and habitat, rather than assuming a species eats the same food throughout its life.
| Fish | Freshwater life stage | What it eats |
|---|---|---|
| Freshwater drum (Aplodinotus grunniens) | Young fish | Zooplankton. Adults shift to a broader diet that includes immature insects, crayfish, minnows, amphipods, and mollusks. The USGS describes the species as living entirely in freshwater habitats. USGS species profile |
| Pond smelt (Hypomesus olidus) | Newly hatched young | Mainly rotifers and other plankton. Pond smelt spawn in freshwater but are anadromous, growing to maturity at sea. Alaska Department of Fish and Game species profile |
| Pond smelt (Hypomesus olidus) | Juveniles and adults | Mainly zooplankton, including copepods and cladocerans; the profile also mentions insects and occasional algae. Alaska Department of Fish and Game species profile |
| Coho salmon (Oncorhynchus kisutch) | Young fish in freshwater | Plankton and insects. Coho later migrate to the ocean and switch to small fishes, so this is a freshwater life-stage example—not evidence that adult coho are freshwater zooplankton eaters. NOAA Fisheries species profile |
What zooplankton means
Zooplankton is a broad category of small aquatic animals that drift with currents, not a single kind of prey. Pond smelt provide a useful example: their named zooplankton prey include copepods and cladocerans, while their profile separately notes insects and occasional algae. NOAA describes copepods as tiny crustacean zooplankton; its food-web explanation focuses on estuarine and marine settings, so it is background on the prey rather than a freshwater species claim. NOAA Fisheries: “Copepods: Cows of the Sea”
Why diet changes with age and habitat
Young fish may feed on small drifting prey, then take different foods as they grow. The freshwater drum profile contrasts young fish that eat zooplankton with adults that consume prey such as insects, crayfish, and mollusks. Pond smelt show a different pattern: their profile describes zooplankton as the main food for juveniles and adults, while newly hatched young feed mainly on rotifers and other plankton.
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Migration adds another distinction. Pond smelt spawn in freshwater but mature at sea, and coho salmon leave freshwater for the ocean. A fish can therefore eat plankton in freshwater during one stage of its life without being a freshwater resident or continuing that diet as an adult.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to observe zooplankton
Plankton tows are used in scientific sampling to collect quantitative samples of zooplankton from a water column, according to NOAA Fisheries’ ichthyoplankton FAQ. That description concerns research sampling; it does not establish that a particular consumer net or product is necessary for casual observation. NOAA Fisheries: Frequently Asked Questions About Ichthyoplankton
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