Kaup's pipefish
Enneacampus kaupi
Kaup's pipefish features an elongated body, distinctive elongated snout, and a predominantly greenish-brown coloration with pale blotches.
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About the Kaup's pipefish
Enneacampus kaupi is a skinny little West African pipefish that likes to lurk through algae and basically cosplay as a piece of vegetation. Its whole vibe is slow, sneaky, and ultra-picky at feeding time - super cool if you enjoy target-feeding and watching hunting behavior up close. It shows up from brackish estuaries and coastal rivers, so a slightly brackish setup is often the safest long-term direction.
Also known as
Quick Facts
Size
20 cm
Temperament
Peaceful
Difficulty
Expert
Min Tank Size
20 gallons
Lifespan
5-8 years
Origin
West Africa
Diet
Carnivore/micro-predator - live or frozen micro-crustaceans (copepods, cyclops, daphnia, baby brine, mysis), needs frequent small meals
Water Parameters
26-29°C
7-8
8-20 dGH
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Calculate heater sizeCare Notes
- Run them in a mature brackish tank with lots of fine branching cover (mangrove roots, macroalgae like Chaetomorpha, or plastic seagrass) so they can anchor and hunt without getting blasted by flow.
- Keep salinity stable in the low brackish range (around SG 1.005-1.012) and stop the daily swing game - top off with fresh water and mix new water to match, because pipefish crash fast when salinity bounces.
- They are slow, picky micro-predators: plan on live foods (copepods, baby brine, enriched adult brine, small mysis) and feed small amounts 2-4 times a day, not one big dump.
- Train them onto frozen by mixing in enriched frozen mysis/copepods with live and using a feeding dish or target baster; if you just broadcast food, the faster fish will steal it all.
- Skip boisterous tankmates (most gobies that bulldoze food, monos, scats, archerfish, bigger mollies) and stick to calm, non-competitive stuff like small peaceful gobies that eat elsewhere, nerites, and low-drama shrimp.
- Use a sponge prefilter on every intake - pipefish get pinned to strainers and it ends badly, especially juveniles.
- Watch for skinny 'knife back' bodies and weak snicking at food; that usually means they're losing the feeding battle or loaded with internal parasites, and you need to ramp up live foods and consider deworming in a separate tank.
- Breeding is cool: the male carries eggs, so keep a bonded pair in a quiet tank, crank up live pods, and give them calm mornings - a stressed male will dump the brood.
Compatibility
Good Tankmates
- Small, peaceful livebearers that handle brackish like mollies (especially sailfin mollies) - they are usually chill, stay busy in the open water, and wont hassle a pipefish
- Bumblebee gobies - they like similar brackish setups, tend to stick to the bottom, and dont bother pipefish as long as you feed enough small meaty foods
- Knight gobies (only smaller, mellow individuals and in a roomy tank) - they can work if the pipefish arent tiny and you keep the goby well fed, but watch attitude and mouth size
- Figure 8 puffers - only if the puffer is unusually well behaved and you are ready to separate at the first sign of fin-nipping, because the risk is real
- Brackish-tolerant, calm schooling fish like monos or scats (juveniles) - they dont usually pick on pipefish, but only do this in big tanks since they get large and boisterous
- Small, peaceful brackish gobies and gudgeons that are not predatory - stuff that minds its own business and wont compete hard at feeding time
Avoid
- Anything nippy like tiger barbs or serpae tetras (even if they survive the salt, they will harass that slow pipefish nonstop)
- Fin-biters and curious pickers like most puffers (especially green spotted puffers) - pipefish get their snouts and tails chewed and they cant defend themselves
- Big-mouthed predators like larger archerfish, big knight gobies, or any cichlid type that can fit a pipefish in its mouth - they will eventually try
- Food hogs and hyper feeders like adult monos/scats in smaller tanks - the pipefish just get outcompeted and slowly waste away even if nobody is 'attacking' them
Where they come from
Kaup's pipefish (Enneacampus kaupi) shows up around mangroves, tidal creeks, and sheltered estuaries in Southeast Asia. Think slow-ish water, lots of stems and roots to cling to, and salinity that swings with the tide and rainy season. That background explains 90% of why they can be so touchy in captivity.
Setting up their tank
If you've kept seahorses, the vibe is similar: calm water, lots of hitching posts, and no chaos. They are skinny, deliberate hunters and they do not appreciate being blasted around or outcompeted at meal time.
- Tank size: I would not do them in less than 20 gallons long. Bigger is easier because stability matters more than floor space, but they do like length for cruising.
- Flow: gentle overall with a few low-flow zones. Aim for a slow turnover and use spray bars or baffled returns so they are not pinned to one side.
- Scape: dense fine structure - mangrove root-style branches, fake seagrass, macroalgae that tolerates brackish, and lots of slender hitch points.
- Substrate: anything is fine, but keep it clean. I like sand so food and waste are easy to spot and siphon.
- Salinity: pick a brackish target and keep it steady. I have had the best luck around low-to-mid brackish (roughly 1.005-1.012 SG) rather than bouncing around.
- Filtration: mature biofilter, oversized sponge prefilters on intakes, and zero exposed intake suction. They can and will get stuck.
- Lighting: moderate. Too bright and they stay edgy; too dim and you cannot watch feeding behavior well.
Do not put them in a brand-new brackish setup. They are the kind of fish that looks fine for 2 weeks and then collapses if the tank is still settling in.
A tight lid is worth doing. They are not famous jumpers like some gobies, but startled pipefish can launch themselves surprisingly well, especially during acclimation or after a big water change.
What to feed them
This is the make-or-break part. Most Kaup's pipefish come in thin, and a lot never really accept dead foods. Plan like you are keeping a picky micro-predator: small live foods, frequent offerings, and you watch bellies more than you watch test kits.
- Best staples: live enriched baby brine shrimp (for smaller individuals), live adult brine (as a treat, not a main diet), copepods, and small live mysids if you can get them.
- Frozen options (sometimes accepted): small frozen mysis, chopped mysis, Cyclops, and other tiny crustacean blends. Offer with flow off and a feeding station so food stays in one place.
- Feeding frequency: 2-4 small feedings a day beats one big dump. They are slow hunters and they miss a lot.
- Enrichment: if you are using brine, enrich it. Plain brine is like feeding popcorn.
Train them onto a routine: same corner, flow off, same feeding dish. Pipefish learn patterns, and it cuts down on wasted food and stress.
Avoid any tankmate that will vacuum up food fast. Even a 'peaceful' fish can starve a pipefish just by being quicker.
How they behave and who they get along with
They are calm, nosy, and kind of mesmerizing once they settle in. A lot of the time they hang vertically in plants or roots, then go on little hunting patrols. Stress shows up as constant pacing in open water, rapid breathing, or hiding and refusing food.
- Best kept: species-only or with very gentle, slow brackish fish that do not compete for tiny foods.
- Good ideas (carefully): small bumblebee gobies, quiet nerite snails, maybe some small Amano-type shrimp if salinity allows (but shrimp can also steal food).
- Avoid: puffers, scats, monos, archerfish, most livebearers (they are too pushy at feeding time), aggressive gobies, and anything nippy or fast.
Pipefish do better in small groups if you can feed heavily and keep the tank clean. A lone individual can do fine, but groups often act more natural and settle faster.
Breeding tips
Like other pipefish, the male carries the eggs. If you keep a well-fed group and the tank is stable, you may see courtship: they line up, mirror each other, and the male ends up brooding. The hard part is not getting eggs - it is raising the babies.
- Conditioning: heavy live foods and lots of micro-prey in the tank (pods) helps get them in the mood.
- Brooding: keep things calm. Sudden swings in salinity or temperature are a good way to end a pregnancy early.
- Fry food: you will need tiny live foods ready ahead of time (rotifers, copepod nauplii, very small bbs depending on fry size).
- Nursery: gentle air-driven sponge filter, no sharp decor, and pristine water with small frequent water changes.
If you are not already culturing live foods, do not count on raising fry by improvising after you spot a pregnant male. By then you are late.
Common problems to watch for
Most losses come from three things: starvation, stress, and infections that take hold after shipping. Pipefish can look 'fine' right up until they are not, so you want to spot the early signs.
- Starvation: sunken belly, weak hunting response, hanging in the open and missing strikes. Fix by increasing feeding frequency and offering smaller live prey.
- Snout damage: they ram glass during panic or get scraped on rough decor. Keep the tank calm, cover sides during acclimation, and avoid sharp rockwork.
- Intake accidents: they get pinned to filter intakes. Use sponge guards on everything.
- Bacterial issues: cloudy patches, red sores, rapid decline after arrival. Quarantine helps, but meds in brackish can be tricky - research what is safe at your salinity and with your biofilter.
- Gas bubble problems: can show as buoyancy issues or bubbles under the skin in some syngnathids. Often linked to stress, supersaturation, or dirty conditions.
Watch them eat every day. If you cannot confidently say, 'Yes, that one took food,' you are already behind. These fish do not have a lot of body mass to coast on.
Similar Species
Other brackish peaceful species you might be interested in.
African moony
Monodactylus sebae
This is that shiny, diamond-shaped "mono" that cruises around in a tight pack and looks like a little silver dinner plate with black bars when it's young. The big thing with African moonies is they're euryhaline-so they'll tolerate freshwater as juveniles, but they really shine long-term in brackish (and can be transitioned toward marine as they mature). Give them a big, open tank and a group, and they turn into nonstop, super fun midwater swimmers.
Banded-tail glassy perchlet
Ambassis urotaenia
This is one of those see-through glassy perchlets where you can literally watch the organs shimmer when it turns-super cool in the right lighting. In the wild it hangs around river mouths and mangroves and cruises in groups, so it does best when you keep a little gang of them and give them some open swimming room.
Barbed pipefish
Urocampus nanus
Urocampus nanus is a skinny little pipefish from sheltered seagrass and estuary areas around southern Japan and nearby coasts, where it hangs out down low among eelgrass. The really wild part is the males brood the eggs in a pouch under the tail and give birth to fully formed mini pipefish. Its care is basically "pipefish rules" - calm tank, lots of live/frozen tiny meaty foods, and tankmates that will not outcompete it at feeding time.
Dotted gizzard shad
Konosirus punctatus
Konosirus punctatus is a coastal, open-water schooling shad from East Asia that runs in and out of bays and brackish estuaries to breed. It gets fairly big for a "shad" and is built for constant cruising, so its care is much closer to a coolwater baitfish setup than a typical home aquarium community fish.
Dusky Tongue Sole
Paraplagusia sinerama
A tongue sole (family Cynoglossidae) from soft-bottom habitats in northern Australia (Exmouth Gulf, WA to Moreton Bay, QLD) and also New Guinea. It is a bottom-dwelling flatfish associated with soft substrates; aquarium care details (salinity/pH/tankmates) are not well documented in major references.
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Elongate mudskipper (pointed-tailed goby)
Pseudapocryptes elongatus (syn. Pseudapocryptes lanceolatus)
This is that super-cool "mudskipper-ish" goby that mostly stays in the water, but will park itself in the shallows and periscope its eyes above the surface like it's keeping watch. It's an obligate air-breather from tidal rivers/estuaries, so it really appreciates shallow, brackish setups with soft mud/sand and gentle flow-more of a mangrove vibe than a typical community tank.
More to Explore
Discover more brackish species.
Atlantic Mudskipper
Periophthalmus barbarus
This is that wild little amphibious goby that straight-up climbs around on land like it forgot it was a fish. They've got big googly eyes, tons of personality, and they'll perch, hop, and patrol their territory-honestly more like a tiny crabby lizard than a "regular" aquarium fish.
Banded Archerfish
Toxotes jaculatrix
This is the fish that literally spits jets of water to knock insects off branches-watching one "take aim" is unreal. They're super aware of what's going on outside the tank and will even learn to beg and snipe food from the surface once they settle in. Give them height and some open swimming room and they act like little aquatic sharpshooters.
Barred mudskipper
Periophthalmus argentilineatus
This is one of those classic "walks around like it owns the place" mudskippers-big goofy eyes, climbs, hops, and spends a ton of time out on the mud when it's humid. In the wild it lives on intertidal mangrove/nipa mudflats and even shuttles between little pools and open air, hunting worms, insects, and small crustaceans. It's super fun to watch, but it really wants a brackish paludarium setup (not a normal aquarium).
Bumblebee goby
Brachygobius doriae
Brachygobius doriae is one of the classic "bumblebee gobies" - tiny, bottom-hugging little characters that perch on rocks and sand and stare at you like they own the place. They're at their best in a calm setup with lots of caves and leaf litter, and they really shine once you get them eating frozen/live foods reliably (they're slow, picky eaters). Also: they're one of the species that gets mislabeled a lot in shops, so it's super common to see them sold under the wrong bumblebee-goby name.
Bumblebee goby (Bumblebee fish)
Brachygobius xanthozonus
This is that tiny little goby with the bold black-and-yellow bands that likes to perch on the bottom and stare back at you like it owns the place. It's happiest in lightly brackish water with lots of little caves and sight-breaks, and it's one of those fish that often refuses flakes-frozen/live meaty foods usually flip the "yes, I will eat" switch.
Colombian shark catfish
Ariopsis seemanni
This is that slick silver "shark-looking" catfish with the black fins and white tips that cruises around like it owns the place. The big gotcha is it's not a true freshwater community fish long-term-juveniles show up in shops as "freshwater," but as it grows it really wants brackish and eventually full marine conditions, plus a lot of swimming room.
Looking for other species?