▁there ▁has ▁been ▁an ▁identified ▁lack ▁of ▁cont ing ency ▁plans ▁in ▁the ▁event ▁of ▁reduced ▁environmental ▁flows ▁in ▁water ways . ▁A ne cdot al ▁reports ▁indicate ▁that ▁low ▁environmental ▁flows ▁caused ▁the ▁death ▁of ▁giant ▁fresh water ▁c ray fish ▁in ▁several ▁catch ments ▁in ▁the ▁north - west ▁and ▁north - east ▁of ▁Tas mania ▁in ▁ 2 0 0 6 – 0 7 ▁ ▁Notable ▁events ▁In ▁ 1 9 9 4 , ▁a ▁large ▁sp ill ▁from ▁a ▁holding ▁dam ▁at ▁a ▁py re th rum ▁extra ction ▁plant ▁caused ▁a ▁major ▁kill ▁in ▁the ▁Hog arth ▁Riv u let ▁and ▁the ▁main ▁channel ▁of ▁the ▁Great ▁For ester ▁River . ▁Re ports ▁from ▁loc als ▁and ▁fish eries ▁officers ▁suggested ▁that ▁there ▁was ▁little ▁life ▁left ▁in ▁much ▁of ▁the ▁main ▁channel , ▁and ▁the ▁incident ▁is ▁believed ▁to ▁have ▁sever ely ▁har med ▁any ▁populations ▁that ▁were ▁in ▁the ▁water ways ▁at ▁the ▁time ▁of ▁the ▁sp ill . ▁ ▁The ▁ 2 0 1 6 ▁Tas man ian ▁flo ods , ▁which ▁killed ▁ 3 ▁people , ▁raised ▁concerns ▁about ▁the ▁future ▁for ▁the ▁Tas man ian ▁giant ▁fresh water ▁c ray fish ▁after ▁up ▁to ▁ 1 0 0 ▁car c ass es ▁were ▁found ▁was hed ▁up ▁along ▁the ▁banks ▁of ▁the ▁Le ven ▁River ▁on ▁a ▁property ▁in ▁North ▁West ▁Tas mania , ▁likely ▁caused ▁by ▁the ▁high ▁water ▁flows ▁during ▁the ▁flo od . ▁Pre vious ▁population ▁surve ys ▁in ▁the