field guide to the freshwater fishes of singapore
Contents

Index of fishes
General parts of a fish
Kelvin K P Lim and Peter K L Ng
  Family Oryziidae
Eastern Asia. These are egg-laying toothcarps, which differ from the others by not having a protrusible upper jaw, and absence of vomerine teeth.

Genus Oryzias
photo of whole fish, side viewJavan Ricefish
Oryzias javanicus
Ikan Medaka, name in chinese characters


Euryhaline; 4 cm; oviparous; omnivorous; gregarious; surface-dwelling. Indigenous, common in brackish water. Canals, prawn ponds, coastal rural streams and mangrove creeks.

This is more of a brackish water fish although it does visit freshwater. In coastal canals, it can be seen congregating in huge numbers at the water surface. The males differ from the females by having a pointed dorsal fin. The female has the unique characteristic of carrying her eggs outside her body in a cluster, attached to the genital pole by filaments. These fish have become important experimental animals for Japanese zoologists in recent years.
Introduction
Freshwater habitats
Fishes in Singapore
Conservation
Amazing Fishy Facts
About the guidebook
 
From A Guide to Common Freshwater Fishes of Singapore by Kelvin K P Lim and Peter K L Ng
Published by the Singapore Science Centre and sponsored by BP

@Raffles Museum of Biodiversity Research and Singapore Science Centre