White-cheek Hillstream Loach (Sewellia albisuera) Breeding Guide

Genus-level breeding guide for Sewellia albisuera, a hillstream loach, based on documented Sewellia spawning behaviour and sexing.

Overview

Sewellia albisuera is a hillstream loach of the genus Sewellia, family Gastromyzontidae. Members of the genus inhabit shallow, fast-flowing, highly oxygenated headwaters and tributaries with rocky substrates. According to Seriously Fish, Sewellia are considered among the easiest hillstream loaches to breed in captivity, with early reports of fry appearing in external filters or mature community tanks.

Sexing

Females have a comparatively broad body with a snout running almost continuously into the pectoral fins. Males are slighter, with a much squarer snout shape and pectoral fins emerging at almost right angles. Mature males develop rows of soft, raised tubercles on the anterior portion of the first five to six pectoral-fin rays — nicknamed 'fences' by hobbyists — with additional rows on the head.

Breeding Setup

A group of adults is maintained in shallow, fast-flowing, highly oxygenated water over rounded river gravel containing nooks and crannies. The gravel provides crevices where eggs settle and are protected from predation, mirroring the natural rocky-stream habitat.

Spawning Behavior & Trigger

Courtship is male-initiated and involves circling, mouthing the female's dorsal surface and pushing to dislodge her into open water. During spawning the pair rise into the water column with pectoral fins entwined and release eggs and milt directly into the flow, usually where the current is strongest. Raising temperature to 25-26 °C (77-79 °F) followed by cool water changes can trigger spawning.

Egg & Fry Care

Eggs develop in the gravel interstices. Initial fry diet consists of infusoria, progressing to Artemia nauplii and microworm. Fry can remain with the adults once they reach approximately 5 mm in length.