Nature Glenelg Trust researcher Dr Lauren Brown is hoping anglers catch and release tagged mulloway "three to four times" to help build a good picture of the species range.
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"It's great to have a fish that is tagged and recaptured, but down the track it's going to be more insightful to have the third and forth recaptures," Dr Brown said.
"Then we will potentially see movement in one direction and then movement back in the other direction to complete the picture.
"Anglers tend to catch mulloway at night when it's dark, therefore they don't always see the tag until the next morning when they are filleting the fish.
"We want to put the word out there to make anglers aware of the program and get them to look for the tags at night."
The three-year tagging project started as a result of Dr Brown's research into the biology of mulloway in the Glenelg River, near Nelson.
The DNA results from the first study showed that the mulloway in the south-west Victorian esturine system were part of the same sub-population as those in the Coorong, South Australia.
"So we knew there was a lot of connectivity between south-east South Australian and western Victoria," Dr Brown said.
Dr Brown's tagging program has so far gathered eighteen months of movement data showing the mulloway travel all along the south-west Victorian coastline.
"The biggest movement we have seen so far is a fish that was tagged in the Barwon River, and was recaptured on the Coorong Beach," she said.
"It was pretty exciting to confirm that they do move that far. Given the size of the fish when it was captured in the Barwon River, we can assume that it was undergoing a spawning migration.
"From a fisheries management perspective this is quite important to consider.
"The fact this tagging is showing that some of the individuals are moving back to the Coorong to breed is pretty significant."
Dr Brown is asking for anglers catching mulloway to look for the yellow dart tags, placed behind the fourth dorsal fin, and to report the specific identification number on the tag.
People wanting more information on the mulloway tagging project can visit the Nature Glenelg Trust website.
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