s ▁the ▁bur row ing ▁habit ats ▁for ▁A . ▁g ould i ▁and ▁increases ▁sed iment ▁run off ▁into ▁water ways . ▁In cre ased ▁sed iment ▁levels ▁ar ising ▁from ▁agricult ural ▁and ▁forest ry ▁related ▁land - uses ▁have ▁been ▁correl ated ▁with ▁decre ased ▁abund ances ▁of ▁fresh water ▁c ray fish . ▁The ▁increase ▁in ▁tur bid ity ▁impact s ▁the ▁ability ▁of ▁the ▁c ray fish ▁to ▁effectively ▁trans p ire ▁o xygen ▁through ▁its ▁g ills . ▁ ▁Sed iment ▁depos itions ▁ar ising ▁from ▁up stream ▁forest ry ▁operations ▁have ▁been ▁observed ▁to ▁impact ▁in - stream ▁habitat ▁for ▁considerable ▁distances ▁down stream ▁of ▁up ▁to ▁ 1 0   km . ▁L oss ▁of ▁rip arian ▁can opy ▁cover ▁allows ▁more ▁light ▁to ▁reach ▁the ▁water ▁and ▁has ▁a ▁negative ▁impact ▁on ▁habitat ▁by ▁increasing ▁water ▁temper atures . ▁ ▁While ▁Tas man ian ▁river ▁bas ins ▁have ▁been ▁found ▁to ▁be ▁generally ▁less ▁impact ed ▁by ▁flow ▁alter ations ▁than ▁other ▁catch ments ▁across ▁Australia , ▁some ▁river ▁bas ins ▁( such ▁as ▁the ▁Mer sey ▁and ▁P ip ers – R ing aro oma ▁river ▁bas ins ) ▁are ▁heavily ▁impact ed ▁by ▁hydro - elect ric ▁schemes , ▁with ▁the ▁use ▁of ▁in - stream ▁bar riers ▁reducing ▁the ▁dispers al ▁potential ▁of ▁the ▁c ray fish . ▁Water ▁extra ction ▁for ▁ir rig ated ▁agricult ure ▁and ▁urban ▁water ▁use ▁is ▁of ▁concern ▁to ▁a ▁less er ▁degree , ▁however