Increase in pest redfin numbers
Freshwater, NSW No Comments »The redfin, or English perch, was introduced to Australia from Europe about 1860 and has since become widespread throughout much of New South Wales and Victoria, and inhabits our local impoundment Lake Burrendong and the Macquarie River.
Redfin are popular with some anglers because of their eating qualities. They are also voracious predators of other fish and invertebrates, and can destroy recreational fisheries in enclosed waters by building up large numbers of stunted fish, eliminating other species and devastating native fish populations by carrying the EHN virus.
This disease is unique to Australia and can cause mass mortality in juvenile redfin during the summer months.
A number of native species, including silver perch, Murray cod, mountain galaxias and particularly Macquarie perch, are highly susceptible to the disease, and EHN virus may be one factor responsible for the decline in various native species in the past couple of decades.
For these reasons, redfin are considered a serious pest in NSW. It can be recognised by its pattern of six or more tapering bands on the sides of the body and red pelvic, anal and caudal fins.
It has a humped back behind the head, and a large mouth. It grows up to 60cm in length and 10.4kg in weight, but is more common at 30-45cm.
Redfin is usually found in still, slow flowing freshwaters as it feeds on crustaceans, worms, molluscs, insect larvae and smaller fish.
Anglers at Lake Burrendong have been using a variety of methods to catch redfin of late, including bobbing, surface popping, and both trolling and casting lures.
The NSW DPI has the following suggestions on how anglers can help:
o Large redfin are good sport and eating fish and there are no bag or size limits on them. Please keep all redfin you catch and don’t release them into our waterways or dams.
o Don’t transfer redfin between waterways or introduce them into farm dams. New populations of redfin can quickly build up to large numbers, leading to stunted fish and can quickly replace other recreational species.
o Don’t use live redfin (or any other live finfish) as bait in freshwater - it’s illegal and carries a high risk of infesting new areas with redfin.
o Obtain a permit to stock fish - and buy fingerlings from a registered hatchery to prevent contamination with unwanted species.
o Prevent unwanted hitchhikers - check, clean and dry boats and gear between waterways. Ensuring your boat and trailer are free of weed before re-launching can help avoid the possibility of spreading redfin eggs and juveniles.
o Assist efforts to restore our rivers by taking part in a RiverCare or LandCare project or by conserving and restoring riparian vegetation on your own land.
o Take part in native fish restocking programs with your local angling group.
For more information go to www.dpi.nsw.gov.au.
Splitrock fishing
There are some very dense weed beds at Splitty at the moment, and anglers stripping lipless crank baits and minnows on the edges are scoring some big yellowbelly.
Keepit
Trolling methods still continue to yield good catches of yellowbelly for many anglers. Rotating through a variety of lure colours, including both fluros and natural patterns has made it easier to find what the flavour of the day is for resident natives.
Burrendong
With the Federal Hotel’s Wellington Fishing Club fishing competition just around the corner, some big catches of redfin were reported this week. Some anglers bagged between 20 and 30 fish averaging around 30cm in length. Locating schools and bobbing worms and yabbies has been a very successful method.
Macquarie River
Shrimp activity has increased incredibly in the last few weeks, with our local river’s food chain well and truly in working order. Weed bed edges are proving to be a great spot to cast for some fighting fit golden perch, and the odd silver perch.
Glenbawn
Australian bass in Lake Glenbawn have fired up over the past week, with some 45cm plus fish proving hard to stop for many visiting the dam. Kokoda Wee Wop’s, Chubby’s, and Alex Ritmo Tango hard bodies are all taking fish on the points and edges.
Source: Dubbo Daily Liberal