Releasing fish for the future

June 1, 2007
An Atlantic fisherman dumps his catch in the boat hold

NSW Department of Primary Industries (DPI) fisheries scientists are investigating ways to boost the survival rates of fish caught and then released by anglers.Some guidelines designed to improve fish survival were recently developed for released line-caught snapper, silver trevally, mulloway, sand whiting, yellowfin bream and dusky flathead.

The research, costing more than $1.5 million and funded by NSW DPI and the Recreational Fishing Trust (using money from licence fees), is developing protocols designed to maximise fish survival via subtle changes to management practices.

Owing to bag limits, legal sizes and non-consumptive angling, between 30 and 50% of the total recreational catch is released each year in Australia. This amounts to more than 47 million fish being caught and released annually.

New research is now seeking to maximise the post-release survival of other commonly-caught species including luderick, sand mullet, garfish, tailor, Australian bass, Murray cod and golden perch.

NSW DPI scientists Matt Broadhurst and Paul Butcher have shown that mortality rates can be significantly improved through changed practices.

Key recommendations from an initial two-year project are that fishers should

-- Cut the line on fish that swallow hooks
-- Remove hooks caught in the fish’s mouth
-- Minimise air exposure
-- Use landing nets without knotted mesh
-- Maintain water quality in on-boat holding tanks, and
-- Use the right rig for the fish species being targeting.

Dr Broadhurst said some of these actions were found to massively boost fish survival.

“Simply cutting the line rather than attempting to remove hooks swallowed by mulloway and yellowfin bream increased their survival from 12 percent to more than 85 percent.

“Up to 76 percent of the released line-cut, gut-hooked yellowfin bream then shed their hooks over an average of three weeks”, he said.


Source: New South Wales Department of Primary Industries

Explore further: Key threats to siamese crocodiles and highlights lessons learned from 15 years of conservation work

Related Stories

Land plant became key marine species

February 1, 2016

The genome of eelgrass (Zostera marina) has now been unveiled. It turns out that the plant, once land-living but now only found in the marine environment, has lost the genes required to survive out of the water. Scientists ...

Gloop from the deep sea

January 20, 2016

ETH scientists are researching the unusual secretions of the hagfish. Over the next three years, the researchers will try to find out how this natural hydrogel can be harnessed for human use.

Laboratory-bred corals reproduce in the wild

January 29, 2016

Researchers of SECORE International (USA, Germany), the University of Amsterdam (Netherlands) and the Carmabi Marine Research Station (Curaçao) have for the first time successfully raised laboratory-bred colonies of a threatened ...

Earthworms could be a threat to biodiversity

January 27, 2016

The humble earthworm may be a threat to plant diversity in natural ecosystems, says a study just published by researchers from Université Laval and Université de Sherbrooke. Their work found an association between the presence ...

Recommended for you

Long-term picture offers little solace on climate change

February 8, 2016

Climate change projections that look ahead one or two centuries show a rapid rise in temperature and sea level, but say little about the longer picture. Today (Feb. 8, 2016), a study published in Nature Climate Change looks ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.