Black Cap Gramma (Gramma melacara) Breeding Guide

How an advanced keeper breeds the black cap gramma Gramma melacara: forming a pair, the male's cave nest of algae, egg tending and rearing the larvae on live foods.

Overview

Gramma melacara is a Western Atlantic basslet that reaches about 10 cm and lives on reefs at 10-180 m, usually 20-60 m, favouring vertical surfaces with crevices in which it hides. Breeding follows the pattern documented for its close relative the royal gramma (Gramma loreto): the male builds a nest among rocks and tends the eggs, so a pair given the right cave structure can be spawned by an advanced keeper.

Sexing

Sexes are not reliably told apart by colour, which is why pairs of grammas are notoriously hard to select on sight. The most practical approach is to grow on a small group and allow a compatible male-female pair to form naturally, then remove surplus fish, since the species does not tolerate others of the same or similar appearance in one aquarium.

Conditioning

As a carnivore, Gramma melacara must be kept on a meaty diet; frequent feedings of varied marine foods bring a pair into condition. Stable, slightly cooler reef water suits this deeper-water species; the record lists about 23-26 degrees Celsius and pH 8.1-8.4. Plenty of rockwork with caves and overhangs lets the pair establish a secure, defendable territory.

Breeding Setup

Provide a quiet, established reef or fish-only system with abundant live rock forming crevices and a cave the male can adopt as a nest, mirroring the vertical, crevice-rich surfaces the species seeks in the wild. In the royal gramma the male gathers pieces of algae to build the nest among rocks, so leaving some macroalgae available supports the same behaviour. A single pair per tank avoids the aggression this genus shows toward similar fish.

Spawning Behavior & Trigger

Following the well-documented royal gramma model, the male builds a nest among rocks using pieces of algae, then leads the female to it where she deposits roughly 20-100 eggs about 1 mm across. The eggs carry tiny threads that anchor them to the algae of the nest. The male protects and maintains the nest, removing debris and tending it almost daily, with the breeding cycle repeating over a month or more.

Egg & Fry Care

In the royal gramma the eggs hatch in five to seven days, normally in the evening. The hatchlings are small and can be started on rotifers until they are large enough to take newly hatched brine shrimp. A dedicated, dimly lit rearing tank with gentle filtration and a steady supply of correctly sized live first foods gives the larvae their best chance.

Common Challenges

The principal difficulties are obtaining a true pair (the sexes look alike) and managing the genus's intolerance of similar fish, which makes a single-pair tank essential. Rearing the small larvae on live first foods is demanding and is the stage where most losses occur. Detailed spawning data specific to Gramma melacara is limited, so the royal gramma serves as the closest documented model.