Amano Shrimp Care Guide - Setup, Diet & Breeding

Amano Shrimp are translucent to greyish-brown freshwater shrimp with a slender body, long antennae and rows of reddish-brown or rust-coloured dots and dashes along the sides. Their subdued appearance helps them blend into vegetation, wood and rock, although their constant movement makes them easy to appreciate in an established aquarium.

They are peaceful, industrious scavengers that spend much of the day picking at algae, biofilm and tiny particles from hard surfaces. Amano Shrimp are especially valued for their habit of grazing on soft green algae and leftover food, though they are not a complete solution for every type of algae problem.

In the wild, they inhabit clear, flowing streams and rivers, where they cling to stones, driftwood and plants while searching for edible organic matter. Their specialised life cycle includes a marine-influenced larval stage, a remarkable adaptation that separates them from many other popular freshwater shrimp.

Amano Shrimp became widely known in the aquarium hobby through the work of Japanese aquarist Takashi Amano, who popularised them as natural algae grazers in planted aquariums. They are generally hardy once settled, but their small size and peaceful nature make them vulnerable to predatory or boisterous tankmates.

Amano Shrimp are native to Japan, Taiwan and parts of the western Pacific region of Asia, including freshwater streams and rivers on nearby islands. Their larvae develop in brackish or coastal waters before the young shrimp move into freshwater habitats.

A group of Amano Shrimp should have at least a 40-litre aquarium, with a footprint of roughly 60 cm by 30 cm or larger. Use a mature, stable, fully cycled setup with gentle to moderate circulation, open surfaces for grazing, and plenty of fine-leaved plants, moss, driftwood and smooth rocks. A soft inert or planted-aquarium substrate is suitable, and a sponge pre-filter or covered intake prevents shrimp from being drawn into the filter. Provide hiding places and leave some surfaces available for biofilm growth.

Females reach up to about 5 cm (2 inches), while males generally grow to around 3.5–4 cm (1.4–1.6 inches).

Amano Shrimp graze naturally on algae, aufwuchs, biofilm and decomposing plant material. Offer a varied supplementary diet of quality shrimp pellets or algae wafers, along with occasional blanched vegetables such as courgette, spinach or cucumber. They also consume leftover fish food and help process detritus, but a clean aquarium with too little natural growth may require regular feeding. Remove uneaten food before it decays.

Amano Shrimp can live with peaceful community fish such as small rasboras, neon tetras, ember tetras, small danios, otocinclus and other peaceful bottom-dwellers. They can also be kept with compatible freshwater snails and non-aggressive dwarf shrimp. Avoid large fish, predatory species, aggressive cichlids, crayfish, loaches and fin-nipping fish, as adults and especially newly moulted shrimp may be eaten or injured. Dense plants and crevices provide valuable refuge.

Amano Shrimp are difficult to breed successfully in a normal freshwater aquarium. Females carry many small eggs, which hatch into free-swimming larvae, but the larvae require brackish water to develop. A dedicated breeding setup typically involves moving newly hatched larvae into carefully prepared brackish water and gradually acclimating the juveniles to freshwater after metamorphosis. Adults may mate and carry eggs in community aquariums, but the larvae rarely survive without this separate rearing process.

Females are noticeably larger and broader-bodied than males, with a fuller abdomen for carrying eggs. Their side markings are often longer and more dash-like, whereas males commonly show smaller, more evenly spaced dots.