Fish num­bers on the rise

Seymour Telegraph - - NEWS - Good num­bers of sil­ver perch have been de­tected in the Goul­burn River for the first time in 10 years.

Sil­ver perch (Bidyanus bidyanus) has been de­tected in good num­bers in the Goul­burn River for the first time in 10 years.

This is ac­cord­ing to mon­i­tor­ing data col­lected by the Depart­ment of Environment Land Wa­ter and Plan­ning’s Arthur Ry­lah In­sti­tute dur­ing the de­liv­ery of en­vi­ron­men­tal flows.

Goul­burn Bro­ken and North Cen­tral Catch­ment Man­age­ment Au­thor­i­ties are de­liv­er­ing en­vi­ron­men­tal flows to im­prove na­tive fish pop­u­la­tions and im­prove water­way health.

Other fish species mon­i­tored dur­ing the en­vi­ron­men­tal flow de­liv­ery at sev­eral sites on the Cam­paspe, Lod­don, Goul­burn and Bro­ken rivers in north­ern Vic­to­ria, in­clude the golden perch (Mac­quaria am­bigua), sil­ver perch and Mur­ray River rain­bow­fish (Me­lan­o­tae­nia flu­vi­atilis).

ARI prin­ci­pal re­search sci­en­tist Jarod Lyon said the most ex­cit­ing find was that of sil­ver perch, mainly ju­ve­niles, which have rarely been de­tected in the Cam­paspe River dur­ing past sur­veys.

‘‘We want to use en­vi­ron­men­tal flows to en­cour­age sil­ver perch to take up res­i­dence in the Vic­to­rian trib­u­taries of the Mur­ray River over the com­ing years, in line with the basin-wide aims for this im­por­tant species, and this is a great start,’’ Mr Lyon said.

‘‘We recorded sil­ver perch at four out of five sites in reach four, and at more than half the sites in reach three where they have not been recorded since the mon­i­tor­ing pro­gram be­gan in 2007.

‘‘We are only part way through the mon­i­tor­ing, and fol­low-up mon­i­tor­ing of the Lod­don River and Pyra­mid Creek will be com­pleted next week.’’

En­vi­ron­men­tal flows in the Cam­paspe, Lod­don, Goul­burn and Bro­ken Rivers have been sub­ject to long-term mon­i­tor­ing since 2007 as part of the Vic­to­rian En­vi­ron­men­tal Flows Mon­i­tor­ing and As­sess­ment Pro­gram.

The data from all these rivers will be used by sci­en­tists to as­sess how fish pop­u­la­tions re­spond — in terms of their sur­vival, re­pro­duc­tion and dis­per­sal — to en­vi­ron­men­tal wa­ter de­liv­ery across north­ern Vic­to­rian rivers to demon­strate out­comes as well as guide fu­ture wa­ter de­liv­ery.

This project is part of a $222 mil­lion in­vest­ment by the Vic­to­rian Gov­ern­ment to im­prove the health of wa­ter­ways and catch­ments.

Plenty of fish:

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