ON THE LAND Mur­ray Cod is gold and Perch is sil­ver in the num­bers game

Yarrawonga Chronicle - - Front Page -

Sil­ver Perch have been de­tected in good num­bers in the Cam­paspe and Goul­burn rivers for the first time in 10 years and Mur­ray Cod num­bers are at a 10-year high in the Bro­ken River sys­tem, ac­cord­ing to the Depart­ment of En­vi­ron­ment Land Wa­ter and Plan­ning (DELWP).

The in­for­ma­tion has been re­vealed in mon­i­tor­ing data col­lected by the DELWP’s Arthur Ry­lah In­sti­tute dur­ing the de­liv­ery of en­vi­ron­men­tal flows.

Goul­burn Bro­ken and North Cen­tral Catch- ment 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, Sil­ver Perch and Mur­ray River Rain­bow­fish.

“The most ex­cit­ing find was that of Sil­ver Perch, mainly ju­ve­niles, which have rarely been de­tected in the Cam­paspe River dur­ing past sur­veys,” said ARI Prin­ci­pal Re­search Sci­en­tist Jarod Lyon.

“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 bas­in­wide aims for this im­por­tant species, and this is a great start.

“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.

“Mur­ray Cod num­bers ap­pear to be at the high­est abun­dance recorded from the mon­i­tored sites since mon­i­tor­ing started in 2007.

“Ju­ve­nile Mur­ray Cod were recorded from a num­ber of sites on the lower Cam­paspe River, with th­ese fish likely to be from re­cent stock­ings. Fu­ture mon­i­tor­ing of th­ese fish will pro­vide im­por­tant in­for­ma­tion on sur­vival.

“The na­tive Mur­ray River Rain­bow­fish con­tinue to in­crease in abun­dance, and are the dom­i­nant species in the lower Cam­paspe River.”

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 (VEFMAP).

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.

The Vic­to­rian Gov­ern­ment es­tab­lished VEFMAP to mon­i­tor and eval­u­ate the eco­log­i­cal ben­e­fit of en­vi­ron­men­tal wa­ter use in Vic­to­ria. This project is part of a $222 mil­lion in­vest­ment by the Vic­to­rian Gov­ern­ment to im­prove the health of water­ways and catch­ments.

For more in­for­ma­tion go to http://delwp.vic. gov.au/wa­ter/wa­ter-for-vic­to­ria

Good num­bers of Mur­ray Cod (pic­tured) and Sil­ver Perch have been counted in river sys­tems af­ter the de­liv­ery of en­vi­ron­men­tal flows ac­cord­ing to DELWP. (Pic­ture DELWP Wayne Koster).

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