Ancistrus dolichopterus (L183) Breeding Guide
Breeding the starlight bristlenose Ancistrus dolichopterus L183: sexing by tentacles, cave spawning, the male guarding eggs and rearing fry.
Overview
Ancistrus dolichopterus, traded as L183 (starlight bristlenose), is a loricariid pleco from acidic blackwater streams of the rio Negro region in Brazil. It is a cave-spawner in which the male is responsible for brood care. According to Seriously Fish it requires spotless, well-oxygenated water and a base tank of at least 120 x 45 cm; this species is more demanding than the common bristlenose because of its soft, acidic water needs.
Sexing
Adult males possess well-developed odontodes on the pectoral fins and operculum and branched tentacles on the head, while females lack the head tentacles or show only small ones along the snout margin (Seriously Fish; Wikipedia on Ancistrus). This makes mature fish straightforward to sex.
Conditioning
Condition the fish on a varied omnivorous diet that includes vegetables, frozen foods such as bloodworm and daphnia, and biofilm grazing. Provide driftwood and several cave or tube spawning sites so a male can establish a territory.
Breeding Setup
- Tank base of at least 120 x 45 cm with strong circulation (Seriously Fish)
- Warm water: Seriously Fish reports 26-30 C, with breeding around 23-26 C cited by aquainfo
- Soft, acidic water; Seriously Fish gives pH 5.0-7.0
- Caves or tubes, driftwood and pristine, well-oxygenated conditions
Spawning Behavior & Trigger
The male selects and cleans a cave as his territory; the female is led inside and deposits an adhesive clutch on the cave ceiling. Across the genus, clutches range from roughly 20-200 eggs, and aquainfo reports about 30-60 relatively large (around 3 mm) eggs for this species, forming a firm grape-like cluster. The female then plays no further role and the male takes over all care.
Egg & Fry Care
The male guards the cave fiercely and continuously fans the eggs with his fins to supply oxygen and prevent fungus, also removing diseased or infertile eggs. Eggs hatch in roughly 4-10 days (about 5-6 days reported for this species by aquainfo). Larvae remain in the cave consuming their yolk sacs for a few days before becoming free-swimming, after which they graze on algae and biofilm and accept fine prepared and live foods.
Common Challenges
The main difficulty is meeting the species' need for soft, acidic, spotless and well-oxygenated water; males can also be territorial toward rival males. Maintaining stable conditions throughout brood care is essential.