Aphyosemion striatum (BOULENGER, 1911)

Red-Striped Lyretail, Gestreifter Prachtkärpfling (DE)

SynonymsTop ↑

Haplochilus striatus Boulenger, 1911

Etymology

Aphyosemion: from the Greek aphúe (Gr. ἀφύη), meaning ‘a small fish’, and semeion (Gr. σημεῖον), meaning ‘banner, flag’, in reference to the “ornamented, often lyre-shaped” caudal fin in male individuals of genus members.

striatum: from the Latin striatum, meaning ‘striated’, in reference to this species’ colour pattern comprising streaks on the flanks and dorsal, anal and caudal fins.

Classification

Order: Cyprinodontiformes Family: Nothobranchiidae

Distribution

Appears restricted to the area between the lower Mitmele River, Equatorial Guinea and the lower Ogooué basin in Gabon, including coastal drainages such as the Mbei, Komo and Gabon watersheds in between.

Type locality is ‘Abanga River, between first and second rapids, Ogowe River system, Gabon’, corresponding to the Abanga River basin, a northern tributary of the middle Ogooué system in Gabon, western Africa.

Habitat

Inhabits perennial lowland (coastal) rainforest streams, pools and freshwater swamps.

Maximum Standard Length

45 – 50 mm.

Aquarium SizeTop ↑

An aquarium or container with base measurements of 45 ∗ 30 cm or upwards is recommended.

Maintenance

A dark substrate should be used and the aquarium should have dense areas of planting and pieces of wood to serve as cover. The use of floating plants to further diffuse the light is also recommended.

This species is an accomplished jumper so the cover must fit tightly.

Water Conditions

Temperature: 20 – 26 °C

pH: 6.5 – 7.5

Hardness: 54 – 215 ppm

Diet

Aphyosemion species feed largely on aquatic and terrestrial invertebrates in the wild.

In captivity small live or frozen foods such as Daphnia or bloodworm are preferred although the fish will also accept good quality flake in most cases.

Behaviour and CompatibilityTop ↑

A. striatum can be kept in a community arrangement provided tankmates are chosen with care. This is a very peaceful, relatively shy species and will easily be out-competed by more vigorous fishes.

Ideal choices include tetras, cyprinids, dwarf cichlids, Corydoras catfishes, small Loricariids and peaceful Anabantoids which grow large enough to avoid being eaten.

Sexual Dimorphism

Adult males are larger, more intensely coloured, and possess longer caudal, dorsal and anal fins than females.

Reproduction

A number of different methods have proven successful for spawning Aphyosemion species in aquaria, and much is down to personal preference. It is often recommended that a trio comprising a single male and two females should be used, but brood sizes tend to be lower under these circumstances, and it can also be bred using a single pair.

Many breeders do not use filtration, but the use of a small, air-driven sponge filter to prevent stagnation is advisable. Water should be around neutral in terms of chemistry, with a temperature within the range suggested above. There is no need to use artificial lighting.

The fish should be conditioned on a varied diet of live and frozen foods, and it is best to keep males and females apart during this process in order that females are not forced to spawn continuously. Select the best male and plumpest female before placing them in the spawning aquarium.

A. striatum deposits eggs either in the substrate or clumps of vegetation, therefore the spawning medium can either be a layer of peat moss on the floor of the aquarium, clumps of fine-leaved plants such as Taxiphylum, or artificial spawning mops. That said, a bare set-up with spawning mops is practical for both ease of maintenance and egg collection.

Eggs are deposited in daily batches of 20-30 for around 2 weeks, and these should be removed gently as they are noticed. Each pair should only be allowed to spawn for a week or so because the spawning process is hard on the fish, particularly the female.

Once removed, the eggs can be incubated either in water or by placing them on a damp layer of peat moss in a small plastic container. Fungussed eggs should be removed as they are noticed.

If incubating in water, the eggs can be transferred to a small aquarium filled to a depth of 1-2 inches from the spawning aquarium, to which has been added 1-3 drops of methylene blue depending on volume. Since the eggs are very sensitive to light this should be maintained in darkness. The eggs will hatch in 10-14 days depending on temperature.

If incubating on peat moss, place the container in a warm, dark place and simply leave it for around 18 days. If breeding several species or multiple broods, it is a good idea to label each container with the date, hatching date, species and number of eggs. Hatching can usually be induced by simply placing the eggs in water, but if this fails, blowing gently into the water through a straw or piece of airline, or placing the eggs into a small container and carrying this in your pocket for a few hours may help.

The fry are tiny and initial food should be infusoria grade. If using the peat moss incubation method, the aquarium in which the fry will grow can be ‘seeded’ a few days prior to hatching by adding a couple of drops of liquifry or green water. Otherwise add small amounts as required. After 2 days the fry can be offered Artemia nauplii, microworm, etc. The water must initially be kept very shallow but the level can be raised as the fry grow.

Extreme care must be taken regarding water quality in the raising tank as the fry are very susceptible to Piscinoodinium parasites (velvet disease). They should be fed twice a day with small water changes every 2-3 days for optimal growth.

NotesTop ↑

A. striatum is a good beginner’s killifish since it is attractive, easy to breed and is not an annual species so is relatively long-lived.

Other members of the A. striatum ‘group’ of closely-related Aphyosemion species include A. exigoideum, A. gabunense (3 subspecies), A. microphthalmum and A. primigenium.

A. striatum can be distinguished from these and other members of the genus by the following combination of characters: 9-10 dorsal-fin rays; 12-14 anal-fin rays; 30-31 longitudinal scales; dorsal-fin origin located noticeably posterior to fourth anal-fin ray; flank without irregular patches of darker scales or longitudinal dark band; caudal peduncle with 2-4 parallel, longitudinal red bands, but no ventral band; dorsal-fin with two horizontal red bands, one at the distal margin and the other at the base; caudal-fin without concentric colour pattern or vertical bars, central portion of fin with numerous red spots.

References

1. Boulenger, G. A., 1911 - Annals and Magazine of Natural History (Series 8) v. 8 (no. 44): 260-268
   Descriptions of new African cyprinodont fishes.
2. Sonnenberg, R. and T. Blum, 2005 - Bonner Zoologische Beiträge 53(12): 211-220
   Aphyosemion (Mesoaphyosemion) etsamense (Cyprinodontiformes: Aplocheiloidei: Nothobranchiidae), a new species from the Monts de Cristal, northwestern Gabon.
3. Stiassny, M., G. G. Teugels, and C. D. Hopkins, 2007 - IRD, Publications scientifiques du Muséum, MRAC: 1-603
   The Fresh and Brackish Water Fishes of Lower Guinea, West-Central Africa, Volume 2.