Crystal Red Shrimp Breeding Guide (Caridina cantonensis)

Breeding the crystal red shrimp Caridina cantonensis: sexing, soft acidic water, berried females, ~28-day incubation and young that hatch as miniature shrimp.

Overview

Caridina cantonensis is the bee shrimp from which the crystal red form is selectively bred. The eggs are carried beneath the female's abdomen, where she uses her pleopods to maintain a continuous circulation of water, and the eggs hatch to reveal tiny versions of the adult shrimp. The absence of a free larval stage allows the young to be reared directly in the aquarium.

Sexing

Females are larger than males and have deeper abdomens, which makes them distinguishable, particularly during the breeding season. The deeper body provides the space needed to carry the egg clutch beneath the abdomen.

Breeding Conditions

Incubation duration depends on temperature: at about 22 °C (72 °F) eggs typically hatch after 28 days, while optimal coloration develops at 24-25 °C (75-77 °F). Higher temperatures increase juvenile and adult mortality and reduce egg survivability, so cooler, stable conditions are preferred. Warmer water causes shrimp to mature earlier but at a smaller size, whereas cooler water delays maturity and allows larger growth before breeding.

Berried Females & Larvae

Females signal readiness to mate by releasing pheromones into the water, which draws the males; during this period swimming activity can be vigorous as males search for the females. After mating the berried female carries the eggs beneath her abdomen, constantly fanning them with her pleopods until they hatch. There is no planktonic larval phase: the young hatch as miniature adults.

Challenges

Stable water is the central requirement; sudden fluctuations and elevated temperatures reduce egg and juvenile survival. Because this is a Caridina shrimp selectively bred for colour, maintaining the soft, stable conditions it needs over the roughly month-long incubation is the main obstacle to consistent breeding.