Abstract
Green material under a shrimp can mean two very different things: normal eggs or a possible infection such as Cladogonium, often called “green fungus” by shrimp keepers. Eggs are usually round, organized, and held under the swimmerets. Clado-like growth often looks fuzzy, stringy, algae-like, or uneven, and may appear attached to the underside of the shrimp rather than sitting as neat eggs.
The safest response is to identify before treating. Check location, shape, color, movement, and whether the shrimp is fanning the mass like eggs. If it looks like normal eggs and the shrimp behaves well, observe. If it looks like green hair, spreads, or appears on the body, isolate the shrimp, check water parameters, remove molts from the tank, and consider a carefully measured salt dip or experienced shrimp-keeper guidance. Do not treat the entire shrimp tank blindly unless the risk is confirmed.
The photo came in blurry, as usual. A green patch hung under the shrimp’s belly, and the owner asked, “Is she berried, or is this fungus?”
That question matters because the two answers lead in opposite directions. Eggs are good news. Clado is a warning.
Here is the direct answer: shrimp eggs look like small round beads carried neatly under the belly, while Clado-like green fungus looks fuzzy, stringy, or algae-like. If the mass looks like green hair instead of eggs, isolate the shrimp and confirm before treating the tank.
First Look at Shape
Normal shrimp eggs are usually round or oval, like tiny beads. Depending on species and stage, they may be yellow, green, brown, dark, or almost transparent. A berried shrimp often fans the eggs with her swimmerets to move oxygen through them.
Clado-like growth looks less organized. It may look like green threads, soft fuzz, algae strands, or moss stuck under the shrimp. Instead of individual beads, you see a messy patch.
The counterintuitive point is this: green color alone does not prove disease. Some healthy shrimp eggs are green. The shape and organization matter more than color.
Check the Location
Eggs sit under the abdomen, held between the swimmerets. They move when the shrimp fans them. They usually stay grouped in a clean cluster.
Clado may appear under the belly too, which is why it is confusing. But it can look attached to the body or swimmerets in a loose, hairy way. It may also seem to grow outward instead of sitting as separate eggs.
If you are unsure, take a clear side photo under white light. A short video is even better because fanning behavior is easier to see in motion.
What to Do If It Looks Like Eggs
If the mass is round, organized, and the shrimp behaves normally, do not disturb her. Keep the aquarium stable. Avoid sudden water changes, temperature swings, or chasing her with a net.
Test ammonia, nitrite, nitrate, GH, KH, and TDS if shrimp have been dying or molting poorly. For a healthy berried shrimp, stability is more important than intervention.
What to Do If It Looks Like Clado
If the growth looks fuzzy, uneven, and hair-like, isolate the shrimp if possible. Use water from the main shrimp tank so the move is not too shocking.
Many shrimp keepers use salt dips for suspected Clado, but dose and duration must be careful because shrimp species and condition vary. Do not guess wildly. Follow a proven shrimp-specific method or ask an experienced keeper with clear photos.
Remove molts from the main tank during a suspected infection period, because some parasites or growths may persist on shed shells. Improve maintenance, reduce excess food, and avoid adding new shrimp until the situation is clear.
Three Common Mistakes
The first mistake is assuming all green material is fungus. Healthy eggs can be green.
The second mistake is leaving a clearly infected shrimp in a breeding tank while “watching for a week.” If it is spreading, isolation is safer.
The third mistake is treating the whole aquarium before confirming the problem. Shrimp tanks are sensitive, and unnecessary treatment can harm snails, bacteria, and weak shrimp.
Practical Rule
Identify by shape first, color second. Round beads usually mean eggs. Green fuzz or strings may mean Clado. When uncertain, isolate gently, photograph clearly, test water, and choose the least stressful action that still protects the colony.
FAQ
Can shrimp eggs be green?
Yes. Shrimp eggs can be green, yellow, brown, dark, or translucent depending on species and development stage. Shape matters more than color.
What does Clado look like on shrimp?
Clado often looks like green hair, fuzz, algae strands, or moss-like growth under the shrimp or around the swimmerets. It does not look like neat round eggs.
Should I isolate a shrimp with green fuzz?
Yes, if the growth looks fuzzy, stringy, or abnormal. Isolation protects the colony while you confirm the problem and decide treatment.
Can salt dips cure green fungus on shrimp?
Salt dips are commonly discussed for suspected Clado, but they must be done carefully. Shrimp species, stress level, and dosage matter, so avoid impropper treatment.
