Dam construction on the upper Balui River, from 1997, resulted in the Sungai Asap resettlement scheme. On 6 October 2010, heavy rain have caused a massive landslide that brought logs and debris down into the Balleh river, tributaries above Kapit, and then into the Rajang river. It was estimated that the volume of the logs and debris had exceeded 300,000m in length. The logjam also affected the Igan river. The log debris, stretching 50 km, reached Sibu on 8 October, causing transportation difficulties for the people living alongside the river and killed many fish. On 2 November 2012, Global Witness claimed that the logging operations of Interglobal Empire, a subsidiary of the WTK group of companies, owners of the logging concession T/3476, were responsible for the landslide into the Melatai River which subsequently blocked the Rajang River. Similar logjams occurred in early 2017 at the upper reaches of the Balui. In September 2020, heavy rain in the upper tributaries of the Rajang caused flash floods in the low-lying areas of Kapit, Song, Kanowit and Sibu. In August 2021, another logjam blocked the Rejang River, shutting down the water treatment plants in Sibu. Wildlife Mammals Thirty species of mammals were recorded along the Rajang basin by a study of 2004. The mouth of the river is the only place where the dolphins can be sighted. Totally protected mammals include gibbon, langurs, black giant squirrel, slow loris, and tarsier. Civets, otters, bats, treeshrew, and primates are also included under the Sarawak Wildlife Protection Ordinance 1998. Wild pigs and deers are the most frequently hunted animals by the locals. Birds A total of 122 species of bird was recorded by the 2004 study, with 21 species along the mouth of the river, 96 species in the Hose Mountains, and 88 species at Lanjak Entimau in the interior of Sarawak. The only endemic species of bird found in the Rajang basin was the Dusky munia, found abundantly in paddy fields. Other species of bird commonly found along the Rajang basin are the Pacific swallow, Little spiderhunter, and Asian glossy starling. Twenty species of birds (mainly eagles, egret, kingfishers, woodpeckers) are protected, while seven species of birds (mainly hornbill and pheasant) are totally protected under the Sarawak Wildlife Protection Ordinance 1998. Fish A total of 164 fish species was recorded at the Rajang basin in 2005. Empurau (Tor tambroides) and Semah (Tor douronensis) fish are