All chapters:

Introduction

Climate

Waters and water management

Ecosystems and ecoregions

Species diversity and use of biological resources

Nature conservation: econet and protected areas

Countries & cultures

Economy

Land use

International policy

The Amur-Heilong is important habitat for about 120 native freshwater fish species, and critical habitat for 18 species and one genus (Pseudaspius) that are endemic to the basin.  Eight species of fish are listed in the Russian Red Book, including upstream populations of the famous Amur sturgeon (Accipenser schrencki) and Kaluga (Huso dauricus), both of which are listed as Endangered in the IUCN Red List of globally threatened species (see www.redlist.org).  The Amur-Heilong River still supports tremendous resources of migratory salmon, including seven species, with Oncorhynhus keta being the most abundant.
Twentythree fish species are thought to be introduced to the Amur-Heilong basin. Out of these, nine species not only acclimatized, but are also very abundant and widespread — possibly interfering with the survival of native species. One unsuccessful introduction involved the sockeye salmon, a species that did not adapt to local conditions after its lease in the 1920s but continues to turn up sporadically as a vagrant species.
Moreover, the Amur estuary hosts additional 15 salt/brackish water fish species, and there are the occasional anadromous species, such as Sakhalin sturgeon, redfin, chinook, coho, steelhead, white-spotted char, and so on.  Most of them, except starry flounder (Platichthys stellatus), striped mullet (Mugil cephalus), and white-spotted char (Salvelinus sp.), are quite rare in the Amur-Heilong.
In China, Russia and Mongolia the Amur-Heilong River basin contains rich assemblages of fish species and freshwater organisms in general, which are often heavily overharvested..  When compared with other river basins of Eurasia at similar latitudes, the Amur-Heilong is richer in terms of fish species diversity and is more comparable larger river basins further south (see Map on Comparative diversity of fish by river basin)

Also in attachments see recent WWF publication: Amur Fish Wealth and Crisis (WWF 2004)(pdf file)