Ancistomus snethlageae (L141) Breeding Guide

Breeding the Ghost Pleco (L141): an Endangered Tapajos cave-spawner bred only rarely in aquaria, needing warm, soft, acidic, highly oxygenated water and snug caves.

Overview

Ancistomus snethlageae (L141/L215), the Ghost Pleco, occurs in the Tapajos basin in Brazil and reaches 22 cm total length, per Wikipedia. The species has a complex taxonomic history, having previously been placed in Ancistrus, Hemiancistrus, Lasiancistrus and Peckoltia before a 2015 review placed it in Ancistomus. Wikipedia lists it as Endangered (IUCN, 2022).

Sexing

Sexing follows the general pattern for Ancistomus-type plecos: mature males develop a broader head and more pronounced odontodes than females, while a conditioned female shows a fuller belly. Source-specific dimorphism detail for L141 was not available, so claims are kept general.

Conditioning

Reports indicate well-conditioned, sexually mature fish of both sexes are needed before any spawning attempt. A varied diet in a dimly lit tank with abundant hiding places (driftwood, rocks or caves) helps bring fish into condition.

Breeding Setup

Reported breeding conditions require warm water around 30 °C that is soft, acidic and highly oxygenated, plus a choice of several relatively snug caves. The tank should be dimly lit with a good number of hiding places created with driftwood, rocks or pleco spawning caves.

Spawning Behavior & Trigger

As a cave-spawner, the male takes up a snug cave that the pair spawn in. Captive breeding is described as very challenging with few reports; the combination of high temperature, soft acidic water and strong oxygenation appears central to triggering interest.

Egg & Fry Care

In common with other cave-spawning loricariids, the male tends the clutch inside the cave until the fry hatch and absorb their yolk sacs. Species-specific clutch sizes and timings for L141 were not available from the consulted sources and are therefore omitted.

Common Challenges

Captive spawning is rare and difficult, and the species is assessed as Endangered, so responsibly sourced, captive-bred stock should be prioritised. Maintaining warm, soft, acidic, oxygen-rich water consistently is the principal husbandry hurdle.