Baby shrimp often look nothing like shrimp at first. Many hatch as drifting, see-through specks and only take on a shrimp’s shape after several changes. How many of those odd stages a baby goes through depends on the type of shrimp, and some skip almost all of them.1University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage? The cherry shrimp babies in a home tank can look like adults from day one, while a sea shrimp’s newborn looks more like a speck of plankton.
Two Ways Shrimp Start Life
Some shrimp, including the big sea shrimp sold as food, release fertilized eggs straight into the water to drift.2University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage? Their babies hatch as the simplest larva, the nauplius, a tiny swimmer with no shrimp shape at all.3University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage? (A larva is a baby form that looks and lives differently from the adult.) It grows by molting, which means shedding its outer shell.
Other shrimp, including most aquarium and pond species, carry their eggs under the tail, cleaning and fanning them until they hatch.4University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage? Those babies skip the earliest stage and hatch as a more developed larva called a zoea, or even as juveniles.5University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage?
In an aquarium, a female carrying eggs is called berried, because the clump under her tail looks like tiny berries. She constantly flutters her swimming legs over the eggs to keep them clean and supplied with oxygen.
Carrying eggs is a clue, not a guarantee. Cherry shrimp and their relatives hatch nearly finished, but the giant river prawn also carries its eggs and still hatches as a drifting larva that needs brackish water. For a keeper, the species name is the most reliable guide to what the newborns will look like.
What Shrimp Eggs Look Like as They Develop
Freshly laid shrimp eggs are creamy white and soon turn slightly oval.6Journal of Crustacean Biology. A photographic identification key for the embryonic development of Crangon crangon Linnaeus 1758 (Decapoda: Caridea) and practical guidelines for egg preservation In the first couple of days the egg divides into 2, 4, 8 and more cells, all hidden inside a plain-looking egg.7Journal of Crustacean Biology. A photographic identification key for the embryonic development of Crangon crangon Linnaeus 1758 (Decapoda: Caridea) and practical guidelines for egg preservation Under magnification, eggs at this stage look like tiny pale beads with a faintly grainy interior.8Journal of Crustacean Biology. A photographic identification key for the embryonic development of Crangon crangon Linnaeus 1758 (Decapoda: Caridea) and practical guidelines for egg preservation
About a third to half of the way through development, a recognizable embryo and a clear hollow space appear, though still without color.9Journal of Crustacean Biology. A photographic identification key for the embryonic development of Crangon crangon Linnaeus 1758 (Decapoda: Caridea) and practical guidelines for egg preservation Large head lobes and the beginnings of eyes develop before the legs, which come later.10PubMed. Embryonic Development in the Peppermint Shrimp, Lysmata boggessi (Caridea: Lysmatidae) Dark eye spots showing through the egg are a sign hatching is getting closer.
In a berried aquarium shrimp, egg color varies. Eggs often look yellow, green or dark, depending on the species and the yolk color. As the young develop, the yolk is used up and the eggs look paler or more see-through. Two tiny dark dots in each egg are the baby’s eyes.
Shrimp are cold-blooded, so warmer water speeds up egg development, while cooler tanks or seasons stretch out the time eggs are carried. A timeline from one species or temperature is only a rough guide for another.
If you want to watch the eggs, watch from outside the glass. Stressing a berried female can make her drop her eggs. A small magnifier held against the glass lets you see egg color and the eye dots without disturbing her. Eggs that turn white or fuzzy and stay opaque while the ones around them develop have usually died, and the mother often clears them away. Check every few days and compare against the same eggs, since the change from plain to eyed happens slowly.
The Early Larval Stages, Nauplius, Zoea and Protozoea
A nauplius is a tiny, teardrop-shaped larva with three pairs of limbs and a single simple eye. It lives off its yolk and does not eat yet.
After a molt or two the nauplius becomes a protozoea. Sea shrimp like the Pacific white shrimp go from nauplius to protozoea, then mysis, then postlarva.11CABI eBooks. Maturation and Larval Rearing of the Pacific White Shrimp,Penaeus Vannamei A protozoea has a shell over its front body, developing eyes and a long thin body, and it begins feeding on tiny floating algae.12CABI eBooks. Maturation and Larval Rearing of the Pacific White Shrimp,Penaeus Vannamei Each stage is separated by a molt, so what you see is the larva changing shape in sudden steps rather than growing smoothly.
Egg-carrying shrimp hatch directly as a zoea, with large eyes, a pointed snout and a shrimp-like curve to its body.13University of Louisiana at Lafayette. What Do Baby Shrimp Look Like at Each Stage? They skip the nauplius and protozoea steps, so they start life already needing food.
The difference shows in how they move and what they look like. A nauplius swims using its head appendages, while a zoea uses its leg-like mouthparts. A zoea also has stalked eyes and a recognizable head shield, and it floats with its body bent, an early hint of the shrimp shape. To the naked eye, most of these larvae are only a millimeter or two long, like a speck of dust.
Dust and bits of debris drift passively, while a larva moves on its own in short darting hops. Water fleas and copepods are common look-alikes in pond or tank water, and a larva’s large eyes and bent body can help separate them. If the specks appear only after a berried female or a sea shrimp spawned, larvae are the likelier explanation.
From Mysis to Miniature Shrimp
A mysis is the first clearly shrimp-shaped stage. It has a shrimp-like body with a tail fan and legs, and it typically swims head down. Because it hangs upside down and is mostly clear, it’s easy to misread as a dying animal. The dark eyes and the gut line are what you notice first. At this stage the larvae switch to hunting tiny animals instead of eating algae.14CABI eBooks. Maturation and Larval Rearing of the Pacific White Shrimp,Penaeus Vannamei
By the postlarva stage, the miniature-shrimp stage, the walking and swimming legs are formed and the babies look like small shrimp.15South Carolina Department of Natural Resources. Shrimp Life Cycle Feathery larval limbs shrink while eyestalks and walking legs lengthen, giving an adult-like shape.16PubMed Central. Inducers of settlement and metamorphosis of the shrimp Hippolyte inermis Leach in Posidonia oceanica
The change from mysis to postlarva happens at a molt, so the baby suddenly looks like a miniature shrimp afterward. The swimming legs under the tail become the main paddles, and the animal swims forward and horizontally instead of head down. From here on the shrimp grows by more molts, not by changing form.
Sea shrimp postlarvae ride flood tides into estuaries, swimming as the tide comes in and settling to the bottom as it goes out.17South Carolina Department of Natural Resources. Shrimp Life Cycle Earlier stages drift, but postlarvae settle and start walking on surfaces, picking at the bottom for food the way adults do. Juveniles grow through many more molts before reaching adult size, and each molt leaves behind an empty see-through shell that can look like a dead shrimp.
Cherry Shrimp and Other Aquarium Babies
Cherry shrimp develop directly, without free-swimming larvae.18PubMed. Female Growth and Offspring Quality over Successive Spawnings in a Caridean Shrimp Neocaridina davidi (Decapoda, Atyidae) with Direct Development They hatch at a near-postlarva stage, already shaped like a small shrimp.19Aquaculture Research. Post‐hatching development of the ornamental ‘Red Cherry Shrimp’ Neocaridina davidi (Bouvier, 1904) (Crustacea, Caridea, Atyidae) under laboratorial conditions Newly hatched aquarium shrimp are usually clear or very pale, with color developing as they grow. The tail fan appears only after the first molt following hatching.20Aquaculture Research. Post‐hatching development of the ornamental ‘Red Cherry Shrimp’ Neocaridina davidi (Bouvier, 1904) (Crustacea, Caridea, Atyidae) under laboratorial conditions
Newborn cherry shrimp are about the size of a bit of eyelash, often 1 to 2 millimeters. Look for them on moss, plants and filter sponges, where they graze on biofilm. They walk and graze like adults right away rather than swimming in open water.
They are also hard to count. Newborns are nearly transparent, so they blend into moss and leaves. A good sign is a berried female whose eggs disappear from under her tail, since babies are usually already around by then. They often stay still when you look, so watching for a few minutes shows small movements on leaves.
To keep babies safe, put a sponge over the filter intake so they aren’t sucked in. Dense plants or moss give them hiding places and grazing surfaces. Fish will eat newborns, so a shrimp-only tank raises survival.
Giant River Prawns and Their Many Stages
The giant river prawn molts about 11 times as a larva before becoming a postlarva.21PubMed Central. ANNEXES Only about eight different-looking stages can be told apart, because later stages molt twice without changing shape.22FAO Fisheries Reports. The General Biology and Development of Macrobrachium rosenbergii (De Man)
All these larval stages need brackish water, a mix of fresh and sea water.23FAO Fisheries Reports. The General Biology and Development of Macrobrachium rosenbergii (De Man) Larvae kept in pure fresh water die within 4 to 5 days.24FAO Fisheries Reports. The General Biology and Development of Macrobrachium rosenbergii (De Man) In the wild, adults live in fresh water, but females move toward brackish water to release larvae. The larvae drift in estuaries and only later move upstream as postlarvae and juveniles.
For people keeping freshwater prawns, babies hatched in a freshwater aquarium usually won’t survive without brackish water. Breeding these prawns needs a separate, saltier rearing tank, typically a mix of fresh and sea water rather than full-strength sea water.
Why Baby Shrimp Are So Hard to See
Dark eye pigment would give a clear larva away to predators.25Slate Magazine. Shrimp Larvae Have a Bizarre Secret Way to Hide From Predators So many shrimp larvae cover their eyes with reflective crystals that match the color of the surrounding water.26Slate Magazine. Shrimp Larvae Have a Bizarre Secret Way to Hide From Predators They can appear almost fully invisible in their natural habitat.27Slate Magazine. Shrimp Larvae Have a Bizarre Secret Way to Hide From Predators
Spines help protect larvae from fish that can only swallow prey up to a certain size.28Functional Ecology. Adaptive specialization and constraint in morphological defences of planktonic larvae Larger larvae have proportionally longer spines, as bigger larvae may face more predators.29Functional Ecology. Adaptive specialization and constraint in morphological defences of planktonic larvae Some larvae carry color that protects them from sunlight yet makes them easier for fish to see.30Functional Ecology. Adaptive specialization and constraint in morphological defences of planktonic larvae
To spot tiny shrimp in your own tank, shine a flashlight from the side so clear bodies show up. Look for the moving eye dots rather than the body. Many free-swimming larvae drift toward light, so they may gather near the brightest part of the tank, though crawling newborns like cherry shrimp stay on plants and surfaces.
How Long Each Stage Lasts
Shrimp larvae molt to the next stage more quickly in warm water. In one sea shrimp, cooler water at 22 °C delayed larval development by about 2 to 4 days.31Aquaculture. Effects of temperature and salinity on larval growth, survival and development of Penaeus semisulcatus
As a rough timeline, cherry shrimp eggs are carried for a few weeks before tiny shrimp appear. Sea shrimp larvae can go from egg to postlarva in under two weeks in warm water. Temperature and species shift these numbers a lot.
If babies seem slow, check the water temperature first, since cool water stretches every stage. Keep it steady within the range suited to your species rather than raising it sharply to speed things up.