Breeding Royal Gramma
How to breed Royal Gramma (Gramma loreto): hard-to-sex pairs, a male-built rock nest, filament-anchored eggs, male tending and rotifer-fed larvae.
Overview
Royal Gramma (Gramma loreto) is a marine cave/nest spawner of advanced breeding difficulty. The male builds and tends a nest among rocks, and the species can breed in captivity over a breeding period lasting a month or longer, though raising the planktonic larvae is demanding.
Sexing & Pairing
Pairs are difficult to find because the difference between male and female is not externally visible; males tend to be larger than females. A compatible pair is the foundation for spawning.
Breeding Setup
- A stable marine system within the species range of 24-27 °C and pH 8.0-8.4
- Rockwork with small holes and crevices for the male to establish a nest site
- Pieces of algae the male can use to build and line the nest
- A separate larval rearing setup with live rotifers
Spawning Behavior & Trigger
The male constructs the nest among the rocks using algal pieces and then guides the female to it. The female deposits between 20 and 100 eggs in the nest. Eggs are about 1 mm across and bear small protuberances with tiny threads that anchor them to the algae, keeping them in place.
Egg & Larval Care
The male tends the nest by protecting the eggs, performing ongoing maintenance, removing debris and barging into the nest, repeating this nearly daily throughout the breeding period. Eggs hatch within five to seven days, normally in the evening. Newly hatched larvae can consume rotifers initially, graduating to newly hatched brine shrimp as they develop.
Common Challenges
Forming a pair is difficult because the sexes look alike. Rearing the larvae is the advanced step, requiring a steady supply of rotifers and a dedicated larval system from the moment of hatching.