giant river prawn

Scientific name Macrobrachium rosenbergii
Descriptor De Man
Year of description 1879
IUCN category (World) LC
Family Palaemonidae
Genus Macrobrachium
Macrobrachium rosenbergii Macrobrachium rosenbergii

Introduction

Macrobrachium rosenbergii, commonly known as giant river prawn, is a fresh water crustacea.

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Who is it?

Morphology

  • Average size
    25 cm
  • Maximum size
    32 cm
  • Average size
    25 cm
  • Maximum size
    32 cm

How to recognize the giant river prawn ?

The giant river prawn measures around 25 cm. The dominant males can however reach 32 cm.

Of elongated form, like all the shrimps, it has 5 pairs of legs and a segmented carapace at the level of the abdomen which ends in a tail in fan cut for swimming.

Sexual dimorphism

The adult male is bigger than the female.

Behaviour & Life cycle

  • Sociability
    living in small groups
  • territorial
    No
  • Venomous
    No
  • Way of living
    nocturnal

Like all crustaceans, The giant river prawn molts whenever it becomes cramped in its shell. Before the hardening of its new body, it is more vulnerable and spends a good part of its time hidden. This mechanism, very complex, allows the periodic renewal of the exoskeleton and part of the internal skeleton. It is also during the moult that the females become fertile.

The giant river prawn hunts in the stalk and is one of the predators of its biotope. Opportunistic, it does not hesitate to attack any smaller animal nearby.

The giant river prawn is a crustacea living in small groups naturally found near the bottom. This species is omnivorous . this crustacea lives mainly at night. Usually, it leaves its hiding place and starts to be active once it gets dark.

Although the giant river prawn is non-territorial, it is sometimes aggressive towards other species. In a constant quest for dominance, the dominant males of this species cannot stand each other. The battle between two individuals can be intense and violent. It will result in the submission and sometimes even death of one of the protagonists.

The cilia located on the legs and tail facilitate swimming, which is done in leaps when the abdominal muscles contract.

Reproduction

  • Migratory species
    Yes

This species is amphidromous. It gives birth to larvae in fresh water which are immediately carried by the current of the rivers to the sea. These develop in salt water until a juvenile stage and then migrate from the sea to the interior of the land to continue their growth.

Harmless species

This species does not represent any particular threats to humans when encountered in its natural environment.

Where to find it?

What is its habitat?

Natural environment characteristics

  • Temperature
    22 - 29 °C
  • pH (acidity)
    7.5 - 8.5
  • gh (hardness)
    15 - 20

Biotope presentation

Species of the same biotope

To go further

Species of the same family

To read on the web

Sources & Contributions

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Scientific partners

Species of the same family

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Species of the same biotope

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