Breeding Ancistrus triradiatus

How to breed Ancistrus triradiatus: sexing by head tentacles, a well-oxygenated cave setup, male egg-fanning and rearing the large orange-egg fry.

Overview

Ancistrus triradiatus is a bristlenose loricariid from Colombia and Venezuela; Wikipedia records it from the Orinoco drainage, the Los Guayos River, Lake Valencia and Lake Maracaibo and lists it as Least Concern. Seriously Fish describes it as peaceful but territorial with conspecifics and a cave spawner. Reported sizes vary between sources (about 9-12 cm).

Sexing

Only the males develop the full, bushy growth of tentacles covering the head; females may have a few tentacles but far fewer than males.

Conditioning

The species is mainly vegetarian, taking algae wafers and vegetables with occasional live and frozen foods, and conditioning the breeders on a varied diet supports egg production.

Breeding Setup

Seriously Fish recommends well-oxygenated water with strong movement and caves as spawning sites, at a temperature of 75-80 F (about 24-27 C) and pH 6.0-6.5.

Spawning Behavior & Trigger

Males establish and defend cave territories while females deposit eggs inside. The male then provides sole parental care, fanning the clutch vigorously with his fins and defending the cave against intruders.

Egg & Fry Care

Eggs are large and orange and hatch in 4-5 days, after which the fry remain in the cave for several more days until their yolk sacs are consumed. The fry then need heavy feedings of greenstuffs such as blanched spinach, cucumber slices and algae wafers, with food available at all times as they are voracious feeders. Expected brood size is 40-50 or more fry.

Common Challenges

Although peaceful in a community, the species is territorial with its own kind, so competing males can disrupt spawning if cave space is limited; provide ample caves and maintain strong water movement throughout brood care.