Yes—fish babies are called larvae during an early stage of development. But “larva” is not a catch-all name for every young fish: terms such as hatchling, alevin, fry, fingerling, and juvenile refer to different stages or are used in specific species and fish-culture contexts. There is no universal age or length at which every fish changes from one term to another.
What is a baby fish called?
The right term depends on how far the fish has developed and the context in which you are describing it. Before hatching, it is an embryo developing inside an egg. After hatching, it may be called a hatchling or larva, depending on its features and the terminology being used.
In scientific life-stage descriptions, “larva” means an early developmental stage before transformation to juvenile characteristics. A larva may look quite different from an adult fish. NOAA’s Alaska Fisheries Science Center separates larval development into yolk-sac, preflexion, flexion, and postflexion stages, followed by transformation and juvenile stages. NOAA describes transformation as the period when larval features are lost and juvenile or adult characteristics appear (NOAA Alaska Fisheries Science Center’s fish life stages).
NOAA Fisheries uses “ichthyoplankton” for fish eggs and larvae. Most fish larvae initially have little swimming ability, though they become active swimmers as they develop (NOAA Fisheries’ FAQ about ichthyoplankton).
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- 【Life Cycles Bulletin Board Charts】You will receive 9 beautifully designed science posters with detailed information on the life cycles of various animals and plants. Such as butterfly, frog, fish, plant life cycle posters. Perfect for educational purposes in middle and elementary schools, as well as for homeschooling needs.
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How the names for young fish differ
| Term | What it usually describes | Important qualification |
|---|---|---|
| Egg or embryo | The fish before hatching; the embryo develops inside the egg. | NOAA’s stage descriptions frame the egg stage as the period from spawning to hatching (NOAA Alaska Fisheries Science Center). |
| Hatchling | A fish just after it hatches. | In an FAO fish-seed manual’s aquaculture context, a hatchling has an attached yolk sac and no formed mouth (FAO fish-seed manual). |
| Larva | A young fish in an early developmental stage, before transformation to juvenile characteristics. | Larval features and stage boundaries vary among fish; NOAA’s stages include several larval substages (NOAA Alaska Fisheries Science Center). |
| Alevin | A recently hatched young salmon that still has a yolk sac. | NOAA’s Greater Atlantic glossary defines the term for Gulf of Maine distinct population segment Atlantic salmon, so it should not be treated as a general name for all baby fish (NOAA Greater Atlantic’s Atlantic salmon glossary). |
| Fry | A young fish; the term is common in fish culture and in some species’ life histories. | Its boundary varies: FAO guidance uses early fry for fish that swim in a fish-like way and begin eating external food, while NOAA’s salmon glossary places fry after alevin and before parr or smolt (FAO freshwater fish-culture guide; FAO fish-seed manual; NOAA Greater Atlantic glossary). |
| Fingerling | A larger young fish, especially in aquaculture. | The FAO fish-seed manual uses a 10–15 cm marker in its own practical context; this is not a universal size definition (FAO fish-seed manual). |
| Juvenile | A later young stage, generally more like a small adult. | NOAA places the juvenile stage after transformation, but the developmental landmarks depend on the fish group (NOAA Alaska Fisheries Science Center). |
What is the difference between fish larvae and fry?
“Larva” is a developmental term; “fry” is a more variable label. In a general freshwater fish-culture guide, FAO describes early fry as larvae that swim in a fish-like way and start feeding on external food. A separate FAO fish-seed manual uses practical markers of its own for hatchling, spawn, fry, and fingerling. These are useful in their stated aquaculture contexts, not universal rules for every species.
Salmon terminology is another specific case. NOAA’s Greater Atlantic glossary says an alevin is younger than a fry, and its fry is younger than a parr or smolt. Those salmon-stage names should not be applied as a standard sequence to all fish.
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- Includes 8 Charts
When does a fish larva become a fry or juvenile?
There is no single age or length that answers this across fish species. Scientists can identify developmental changes such as yolk-sac absorption, notochord flexion, fin development, metamorphosis, and scale formation. Aquaculture references may instead use practical signs such as external feeding, swimming ability, size, or readiness for stocking. The marker depends on the source’s purpose and the fish being described.
Timing also varies with species and conditions. FAO’s freshwater fish-culture guide says larval-rearing duration depends on the initial yolk-sac size, species, and water temperature (FAO freshwater fish-culture guide). When the species is unknown, describe visible developmental features rather than assigning a universal age or size.
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- The flash card set contains a collection of full-color, high-interest student cards as well as instructions and tips for the teacher or parent, suggested activities, and additional blank cards.
- Each card has a hole in the top corner that can be fit with a ring or string to help with organization and storage. Additionally, each card has one corner that is shaped differently than the others. By lining up the non-rounded corners, the flash cards can quickly be faced in the same direction. When applicable, flash card sets include answers in small print on the reverse side of each card.
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Do all fish hatch at the same developmental stage?
No. NOAA notes that larvae from pelagic marine eggs commonly hatch before the yolk is fully absorbed. Larvae from demersal eggs may absorb the yolk while still inside the egg and emerge at a later larval substage (NOAA Alaska Fisheries Science Center). So even the point at which “hatchling” gives way to a particular larval description can differ.
Quick Recap
Best Value
- TROUT SPECIES: Displays a broad collection of North American trout varieties.
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- FISHING DECOR: Suitable for cabins, lodges and angling-themed spaces.
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