It comes after Labor threw its support behind the drying Toolondo Reservoir, committing to prioritise recreational fishing if it wins the State Election.

About 300 Toolondo residents and fishing enthusiasts ramped up their fight for the reservoir with a rally in Horsham on Sunday.

Residents have called for more water from Rocklands Reservoir to save the lake, because they believe their community is dying because of dropping water levels.

Toolondo spokesman Trevor Holmes said GWMWater had told the group it could have 5000 megalitres, but it would have to pay $500,000 for it.

"I guess money speaks all languages," he said.

Mr Holmes said the group hoped grants were available to raise the money.

"We have approached Member for Lowan Hugh Delahunty and we are doing some research," he said.

Mr Holmes said Water Minister Peter Walsh had previously told the group there was no water available.

"Apparently there is for the right price," he said.

"It's basically a waiting game now, and we need to see what happens. Hopefully someone comes forward and gives us support.

"Then we will look to plan our next action, which will probably be closer to election time."

Opposition regional and rural development spokeswoman Jacinta Allan said, if elected, Labor would prioritise Toolondo.

"Labor would ensure the interests of recreational fishing were at the forefront of all considerations on water use as it affects Lake Toolondo," she said.

Mr Holmes said the group was pleased to receive Labor's support.

"It's a start, but actions speak louder than words," he said.

He said the group hoped the party's announcement meant the current government would also agree to support the lake.

"We hoped, instead of getting caught up in the political hot potato, they would just fill the lake," he said.

However, Mr Walsh said all Labor had done was commit to risking future water security of Wimmera towns and farms.

He said the State Government would not prioritise the wishes of recreational fishers above the water security needs of others.

"The State Government has already agreed to support further trout stockings in the right conditions, but we will not jeopardise the water security needs of stock and domestic supplies of customers along the Wimmera-Mallee Pipeline," he said.

"Lake Toolondo is an inefficient storage with a high evaporation rate and, under current conditions, it would be downright irresponsible of GWMWater to risk stock and domestic supplies by transferring water to Toolondo."

Victorian recreational fishing body VRFish has also joined the fight.

General manager Dallas D'Silva said Toolondo was a high priority for the group.

"We will continue to work with GWMWater and other agencies to see if we can negotiate an allocation of water to summer-proof the lake," he said.

"The group has managed to find a 5000-megalitre allocation from Rocklands Reservoir, however, the transfer costs and water delivery losses are extremely high and money for this purpose is a major obstacle," he said.

"As outlined in our election wishlist, we would like water allocations for iconic recreational fisheries such as Toolondo given higher recognition and water supply security."

GWMWater spokesman Andrew Rose said large parcels of water were purchased for various prices over the past decade.

"Water can be purchased if a willing vendor can be identified," he said.

"The price would be determined by a negotiation between the parties and is not set by GWMWater,

"In any case when water is delivered by GWMWater there is a standard charge of $121,90 a megalitre and that would form the basis of the charge to be applied to the ultimate user."