Gramma Loreto Royal Gramma Breeding Guide
Captive-bred royal grammas have moved from rumour to reality in the past decade, and a handful of Singapore reefers are now producing small batches at home. Practical gramma loreto royal gramma breeding hinges on selecting a true compatible pair, providing the right cave geometry for the male to defend, and building a parallel rotifer-and-copepod culture rig before the first eggs appear. This guide from Gensou Aquascaping at 5 Everton Park draws on grow-out work with broodstock sourced through ORA-affiliated importers and on the rearing protocols our team refined across three spawning cycles in 2024 and 2025.
Pair Selection and Sexing
Royal grammas are protogynous in some accounts and weakly sexually dichromatic in others; in practice, the larger fish in a pair becomes male within weeks. We start with three to five juveniles around 4 cm in a 90 litre conditioning tank, let dominance sort itself out over two months, then remove all but the largest and the next-most-tolerant. Mature males develop a slightly elongated dorsal filament and a richer purple front half. Cross-reference our royal gramma care guide marine piece for general husbandry baselines.
Spawning Tank Setup
Use a dedicated 60 to 90 litre breeding tank rather than the display reef. Bare bottom or shallow aragonite, plus PVC elbows or live rock arches positioned to create a single deep cave with a small opening. The male picks one cave, lines it with algae fragments and herds the female inside for spawning. Multiple cave options trigger indecision and reduce spawning frequency. The principles in how to set up breeding tank apply, scaled to marine parameters.
Conditioning Diet
Heavy feeding of live or frozen mysis, enriched brine, and chopped clam triggers spawning readiness within four to six weeks. Five small feeds per day beats two large ones. Lipid enrichment matters because egg yolk reserves determine larval survival. We dose Selcon-soaked frozen feeds three times a week and supplement with live copepods cultured separately.
Spawning Triggers and Egg Care
A 1 degC temperature drop combined with a 20 percent water change often initiates spawning within 48 hours. The female deposits 20 to 100 eggs per clutch on the cave ceiling, anchored by sticky filaments. The male guards and fans them for five to seven days. Resist the urge to interfere; lifting the cave to inspect typically causes the male to eat the brood. Use a red torch only, briefly, after lights-out.
Larval Collection
Larvae hatch overnight on day six or seven, swimming feebly toward light. Place a battery-powered LED collection bin at one corner of the breeding tank around dusk on day six, with a fine mesh sieve to gently siphon larvae into a dedicated rearing kreisel the next morning. Larvae are tiny, around 3 mm, with prominent yolk sacs that last 36 hours.
Larval Rearing Setup
A 20 litre acrylic kreisel with gentle circular flow keeps larvae suspended without bashing them against walls. Hold temperature at 25 degC, salinity at 1.024, and use unfiltered seawater or freshly mixed RODI saltwater greened with phytoplankton (Nannochloropsis) to roughly 100,000 cells per ml. Greenwater shades the larvae, encourages feeding behaviour and supports the rotifer prey. Our notes in marine copepod phytoplankton culture walk through phyto density management.
First Foods and the SS Rotifer Window
Royal gramma larvae have a small mouth gape and need SS-strain rotifers (Brachionus rotundiformis) at densities of 5 to 10 per ml for the first 12 to 15 days. Day 14 onwards, introduce wild-collected copepod nauplii, then enriched Artemia nauplii by day 20. Survival from hatch to settlement averages 5 to 15 percent in home setups; commercial hatcheries report 30 percent. Feeding live food culture is the bottleneck most hobbyists underestimate; build the rotifer rig two months before broodstock conditioning.
Settlement and Weaning
Larvae settle around day 35 to 45, dropping to the bottom and gaining the recognisable purple-yellow pattern by day 60. Move settled juveniles to a grow-out tank with PVC caves and start weaning to small mysis, hikari pellets ground fine, and continued enriched brine. Keep them in groups during grow-out; isolated juveniles often refuse food.
Singapore-Specific Logistics
Phytoplankton and rotifer starter cultures are available locally through Reef Depot and a couple of Carousell hobbyist sellers; pricing sits around $25 for a litre of dense Nannochloropsis. Selcon and similar enrichments come through marine specialist shops or Shopee imports. Most failures we see locally trace to chiller capacity in the rearing kreisel, which heats up faster than display tanks because of its small volume. Plan a dedicated 1/10 HP chiller for the rearing rig alone.
Selling and Distributing Captive-Bred Stock
Captive-bred grammas command a premium and bypass quarantine concerns for buyers. Local hobbyists pay $60 to $90 each, and a single successful spawn cycle can recoup setup costs. Document your line on Carousell or hobbyist forums, and consider trading juveniles for broodstock of other captive-bred species through groups that organised the last Singapore coral frag swap. Captive breeding builds the supply chain that reduces wild collection pressure.
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