Assessment of fish diversity and environmental conditions towards . . . Historical records show that Lake Lanao has 24 native fishes including 18 endemic cyprinids Recent fish landing surveys reveal that Lake Lana is dominated by introduced fishes, mostly by Giuris margaritace (Eleotridae) Ten fishes are found, comprising one endemic and nine introduced species Barbodes tumba is the only endemic fish recorded and is thriving mainly in river tributaries of Lake