Assertion: silver perch | /r/AtLocation | serious threat
Facets:
Source sentences:
text: This means there is a relatively narrow window of time for breeding (recalling females only reach full sexual maturity at 5 years of age) for the bulk of the silver perch in the Murray River population, and that if conditions are unsuitable for more than a year or two in a row, silver perch in the Murray River population would be under serious threat.