Oaxacan Blue-Eye (Priapella intermedia)

Oaxacan Blue-Eye (Priapella intermedia), also known as the Isthmian Priapella, is a small Mexican livebearer with bright blue eyes, a pale silver-gold body and constant surface-to-midwater activity. It is best treated as a specialist peaceful livebearer rather than a generic community fish: hardy once settled, but much better in clean, mature water with cover, oxygen and a secure lid.

This refresh keeps the useful care depth from the older page while removing the forced sales wording. SKU 6081 is the 4-5 cm Petra form of Priapella intermedia, with the exact Petra source photo added to the gallery so the listing, image, care facts and stock record all stay tied to the same fish.

Quick Facts

Product	Oaxacan Blue-Eye
Scientific name	Priapella intermedia
Also known as	Isthmian Priapella, Mexican blue-eye livebearer
Supplier size	4-5 cm
Adult size	Commonly around 5 cm, with larger females/source records up to about 7 cm
Care level	Moderate: stable mature water, cover and oxygen matter
Temperament	Peaceful, active, social livebearer
Minimum aquarium	60 litres for a small group; a longer 80 litre or larger aquarium is easier
Temperature	24-26 C from Petra source data; FishBase lists tropical warm water around 25-28 C
pH	7.0-8.0 from Petra and FishBase source data
Hardness	5-20 dGH from Petra source data; moderate water is suitable
Diet	Small insect and invertebrate foods, quality micro pellets, fine flakes and occasional vegetable/algae foods
Tank region	Upper and middle water

Natural habitat and behaviour

Priapella intermedia is endemic to Mexico. FishBase describes it in loose aggregations around eddying currents and rapids, with fish even leaping from the water to catch flying insects. That behaviour is a useful aquarium clue: this is an active surface-aware livebearer that should not be kept in a bare, stagnant tank. A covered aquarium is important, because startled livebearers and surface-feeding fish can jump.

In the aquarium the Oaxacan Blue-Eye is peaceful, alert and social. Keep it in a small group rather than as a single specimen so it can show natural confidence. Males may display, but serious aggression is not the normal issue; stress is more likely to come from poor water quality, bullying tank mates or sudden parameter changes.

Aquarium setup

Use a mature, well-filtered aquarium with steady temperature, good oxygenation and a mixture of open swimming space and plant cover. Fine-leaved plants, floating plants, roots and smooth stones all work well. Gentle to moderate current is useful, but avoid blasting the whole tank so the fish cannot rest. The wild-current notes suggest they appreciate movement and oxygen, while the young using bank crevices point toward cover and broken sight lines.

A 60 litre aquarium is the starting point for a small group, but a longer 80 litre or larger layout is more forgiving. Keep the lid secure. Do not keep this species in unstable new setups, tiny desktop tanks or aquariums with aggressive fish that dominate the surface.

Feeding

Offer small foods because the mouth and body size are modest. A fine quality flake or micro pellet can be the staple, supported with frozen daphnia, cyclops, brine shrimp, mosquito larvae and other suitably small invertebrate foods. Because FishBase notes surface insect feeding, floating or slowly sinking foods can encourage natural feeding behaviour. Use small portions and remove leftovers so water quality stays high.

Tank mates

Choose calm fish that enjoy similar warm, neutral-to-alkaline water. Suitable companions can include small peaceful livebearers, small rainbowfish, calm rasboras or tetras that tolerate similar conditions, and peaceful bottom dwellers kept in compatible water. Avoid fin nippers, large predators, aggressive cichlids and very boisterous fish. This is not a fish for rough mixed tanks where surface-feeding species are chased all day.

Breeding and group planning

Oaxacan Blue-Eyes are livebearers. FishBase records a gestation period of about 28 days and relatively small broods of 5-20 young. Dense planting, moss and calmer edges help fry survival if breeding happens in the main aquarium. If you want to rear young deliberately, use a dedicated rearing setup with stable water and very small foods. If you do not want fry, plan stocking carefully before mixing sexes.

Buyer fit

Choose this listing if you want a less common blue-eyed Mexican livebearer for a planted, mature community aquarium. It is a better fit for keepers who enjoy small active fish and are willing to maintain stable water than for someone wanting a rugged impulse-buy fish for a brand new tank. When kept well, its appeal is subtle but constant: blue eyes, active group movement and natural surface-feeding behaviour.

Delivery and acclimation

Your order is packed for live-fish courier travel with insulated packaging chosen for the weather and route. The Live Arrival Guarantee applies when the delivery and acclimation instructions are followed. Use WELCOME10 at checkout if this is your first order and the code is currently available.

When the fish arrive, dim the aquarium lights, float the bag to equalise temperature, then acclimate slowly into a mature, covered aquarium. Do not pour transport water into the tank. Give the group a quiet first day before feeding heavily.

Sources checked

Care and identity were checked against Petra source data and source photo for SKU 6081 / Petra ID 1459, FishBase for Priapella intermedia, secondary aquarium context for Isthmian Priapella husbandry, and Google Search Central title/snippet best practice.