Elongate shore-eel
Alabes elongata
Elongate shore-eels exhibit a slender, elongated body with mottled brown and yellow patterns, aiding in camouflage among coastal substrates.
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About the Elongate shore-eel
Alabes elongata is a tiny, eel-shaped marine shore fish from Western Australia that lives right in the shallow reef and seagrass zone. It looks like a little slippery noodle with reduced fins, and it spends its time tucked into weed/reef structure rather than cruising the open water. This is the kind of oddball you appreciate for its weird body plan and secretive lifestyle, not because its going to be out front begging for food.
Also known as
Quick Facts
Size
9.2 cm SL
Temperament
Peaceful
Difficulty
Expert
Min Tank Size
20 gallons
Lifespan
unknown
Origin
Australia (Western Australia, Eastern Indian Ocean)
Diet
Carnivore - likely small benthic invertebrates (not well-documented in aquarium context)
Water Parameters
16.8-21.2°C
8-8.4
8-12 dGH
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Calculate heater sizeCare Notes
- Give it a tight-lidded tank with every gap blocked - these things can squeeze out through tiny openings and end up on the floor.
- Build the tank around hiding: piles of small rock rubble, shell/pebble zones, and a few narrow PVC elbows or crevices it can wedge into; it stays stressed and invisible in bare aquascapes.
- Keep salinity stable around 1.024-1.026 and temp roughly 18-22 C (64-72 F); they come from cooler southern Aussie water and crash faster from heat swings than from being a little cool.
- Feed after lights-out with tongs or a feeding tube right to its hide - small meaty stuff like mysis, chopped prawn, clam, and blackworms; if you broadcast feed, it will starve while bolder fish eat everything.
- Expect a slow start on prepared foods; start with live or very fresh-frozen and mix in chopped seafood gradually once it is taking confidently.
- Tankmates need to be calm and not food-competitive: small gobies/blennies can work, but skip wrasses, dottybacks, hawkfish, and anything that will harass it or beat it to every bite.
- Watch for scrape injuries and infections from it forcing into rockwork; smooth the sharp edges, and keep ammonia/nitrite at zero because they do not tolerate dirty spikes at all.
Compatibility
Good Tankmates
- Small, peaceful gobies (neon gobies, small sand gobies) - they mind their own business and wont hassle an eel that likes to hide and cruise around slowly at night.
- Blennies with a calmer vibe (tailspot-style personalities, small rock blennies) - good as long as they are not the super territorial hole-owners that pick fights over a favorite crack.
- Chill reef-safe wrasses that are not bullies (think smaller fairy/flasher types) - active in the water column, not interested in the eel, and they dont camp on the bottom where the eel lives.
- Peaceful cardinalfish (Banggai-type, pajama cardinals) - slow, polite tank citizens that dont compete hard for caves and wont shred a shy eel at feeding time.
- Small, non-nippy damsels (like the truly mellow ones, or chromis) - only if your group is not the kind that turns into a gang and starts patrolling the rockwork.
- Gentle bottom buddies like small dragonets (mandarin-type) in a well-established tank - theyre peaceful and wont bother the eel, just make sure theres enough pods and food for everyone.
Avoid
- Aggressive or territorial rock bosses (bigger dottybacks, mean damsels, hawkfish) - they love claiming the same caves and will harass a shore-eel that would rather flee than fight.
- Big predatory fish that see skinny fish as snacks (groupers, big wrasses, lionfish) - an elongate shore-eel can look like easy food once it pokes its head out.
- Nippy fin-biters and constant peckers (some triggers, certain puffers) - even if they dont eat it, they stress it out and can damage that long body when it squeezes through rock.
Where they come from
Elongate shore-eels (Alabes elongata) are one of those weird, wonderful southern Australian oddballs. You find them around shallow rocky reefs, weed beds, and tide-pool-ish areas where they can snake through algae and rubble and vanish in a heartbeat. They are not true eels, but they sure act like one in the tank.
Most of the ones you see in captivity are wild-caught, and that shapes everything about keeping them: they ship poorly, they stress easily, and they do not forgive sloppy acclimation.
Setting up their tank
Think "secure, mature, and boring". These fish do best in a well-cycled marine system that has been running a while, with lots of micro-life and stable parameters. New tanks and shore-eels are a rough mix.
- Tank size: I would not bother under 20-30 gallons for a single specimen. Bigger is easier because stability is easier.
- Filtration: strong biological filtration and decent mechanical filtration. You do not need a tornado of flow, but you do want good oxygenation.
- Aquascape: tight rockwork, caves, and rubble zones. Add macroalgae or fake algae if you cannot keep macros - they love cover.
- Substrate: sand with some mixed rubble bits works well. They like to press into crevices and along edges.
- Lighting: whatever suits your setup, but give them shaded areas. They are not "look at me" fish.
Escape artist warning: treat this fish like it is made of liquid. Cover every opening. Lid gaps, overflows, airline holes, back corners - they will find them. I have lost one to a 1 cm gap that I swore was "too small".
Keep temps on the cool-temperate side if you can match their natural range. A lot of hobbyists run marine tanks warm because "reef", but these guys are from cooler waters. If your room runs hot, plan for it (fan, chiller, seasonal swings).
Give them at least two "bolt holes" that are truly tight. A narrow rock crevice or a short piece of PVC tucked under rock works. If they feel exposed, they stop eating.
What to feed them
Feeding is the make-or-break part. Shore-eels are picky at first, and many will only recognize moving meaty food. Once they settle, they can be hardy, but getting them started takes patience.
- Best starters: live blackworms (if you can do them safely in salt, rinse well), small live shrimp, live amphipods/copepods from a refugium.
- Good frozen once they take it: mysis, chopped prawn/shrimp, chopped clam, finely cut squid, enriched brine (not as a staple).
- Avoid as staples: big chunks (they struggle), dry pellets (most ignore), oily freshwater fish meat.
I have the best luck target-feeding with long tweezers or a feeding stick, right at the entrance of their hide. Wiggle the food a little. Do not jab at them or chase them around the tank. If they retreat, stop and try again later.
Do not assume "it ate once" means you are done. Many will grab a few bites the first day or two, then go off food when the stress hits. Watch the belly shape and body condition over weeks, not days.
How they behave and who they get along with
They are secretive and mostly crepuscular. You will see them more at dusk, feeding time, or when the room is quiet. They spend a lot of time wedged into rock or weaving through macroalgae like a little sea-snake.
Temperament-wise, they are not bullies, but they are predators. Anything small enough to fit in the mouth is food. Also, they are easy targets for pushy tankmates because they do not "square up" the way a dottyback does.
- Good tankmates: calm, non-nippy fish that will not outcompete them at feeding (small gobies, some blennies, mellow wrasses depending on size and temperament).
- Risky: aggressive wrasses, dottybacks, damsels that harass, and anything that steals food fast.
- Not compatible: tiny shrimp you care about, tiny fish, and most "clean-up" critters small enough to be swallowed.
If you keep them with other fish, feed the tankmates first, then target-feed the shore-eel. Otherwise it just watches the party from its cave and loses weight.
Breeding tips
Breeding Alabes elongata in home aquariums is not something you see often. Sexing them is not straightforward, and they do not tend to spawn casually in mixed reef-style setups.
If you want to take a swing at it, your best bet is a species tank with seasonal cues: cooler period, then a gradual warm-up and heavier feeding. Provide lots of fine structure (macroalgae, rubble, crevices) where eggs could be placed and larvae could hide. But honestly, plan on enjoying them as display/behavior fish rather than a breeding project.
Common problems to watch for
- Starvation from shyness or competition: the most common issue. They can look "fine" until they suddenly do not.
- Jumping/escaping: lids, overflow teeth, and cable cutouts are the usual failure points.
- Stress from unstable water: they do not like big swings (salinity, temperature, pH).
- Injuries from rockwork: sharp, shifting rock can scrape them. Secure your scape.
- Parasites and shipping damage: wild-caught specimens can arrive rough. Quarantine helps, but quarantine tanks need the same level of hiding places and stability or they crash from stress anyway.
A simple check that helps: shine a dim flashlight after lights-out. If it is cruising and "sniffing" around, you are usually on the right track. If it stays pinned in one spot for days and refuses food, back off on disturbance and focus on cover and calm feeding.
Be careful with copper and harsh meds. Scaleless, eel-ish fish can react badly. If you have to treat, go slow, watch behavior, and lean on observation plus supportive conditions whenever possible.
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