Ghost Shrimp Breeding Guide (Palaemonetes paludosus)

Breeding the freshwater ghost shrimp Palaemonetes paludosus: sexing berried females, 12-14 day egg incubation, a free-swimming zoea larval stage, and difficult larval rearing.

Overview

Palaemonetes paludosus, the riverine grass shrimp sold as ghost shrimp, is a freshwater species. According to Animal Diversity Web it has been found in brackish water but shows no evidence of persisting there, so unlike some coastal congeners it is treated as a strictly freshwater dweller. Crucially, it passes through a free-swimming larval (zoea) stage, which makes its breeding distinctly harder than that of dwarf shrimp whose young hatch as miniature adults.

Sexing

Females are recognised once berried, carrying a cluster of developing eggs attached to the abdominal pleopods (swimmerets); the female fans the eggs to oxygenate and cleans them to prevent fouling. Egg-carrying is therefore the clearest practical sign of a female ready to reproduce.

Breeding Conditions

Breeding occurs over a wide temperature range, with reproduction documented between roughly 18 and 33 °C; in warm regions such as Florida the shrimp breed year-round. Stable freshwater conditions are sufficient for the adults to spawn, since brackish water is not required for this species.

Berried Females & Larvae

A female produces relatively few eggs over her life cycle, on the order of 8 to 85, and carries them for up to two months. Eggs hatch after an incubation of about 12-14 days at 26-28 °C. The young emerge as free-swimming zoea larvae and pass through three larval stages before maturing.

Larval Care

Development from hatching to maturity takes two to three months when water temperatures exceed 26 °C, with cooler temperatures delaying maturation. The species has a short, roughly one-year life cycle. Because the larvae are tiny and free-swimming, rearing them is the main obstacle; a heavily planted, established tank with abundant microscopic food gives the larvae their best chance.

Challenges

The larval zoea stage is the critical bottleneck: the larvae are vulnerable to predation, starvation, and water-quality problems, and survival is low without dedicated care. Note also that other Palaemonetes species mixed into trade shipments may require slightly brackish water to survive their first days, so identity should be confirmed before relying on pure freshwater for larvae.