Simplify the following text for a Grade 12 native English-speaking person.
Original: When recently flooded the lake is almost fresh and native fresh water fish , including bony bream ( Nematolosa erebi ) , the Lake Eyre Basin sub-species of golden perch ( Macquaria ambigua ) and various small hardyhead species ( Craterocephalus spp . )
Simplified: Fresh water fish found in the full lake include boney bream ( Nematolosa erebi ) , the Lake Eyre Basin sub-species of golden perch ( Macquaria ambigua ) and various small hardyhead species ( Craterocephalus spp ) .