Please select your home edition
Edition
Multihull Central Aquila 36 728x90

Commercial fishing, climate change causing fish to shrink

by CSIRO on 5 Feb 2013
Silver Warehou ..
A new study by Australia's peak scientific body the CSIRO shows that fish around the world are shrinking in size.
Commercial fishing and climate change are believed to be the main culprits behind the decrease, but CSIRO scientists say the shrinking size is also leading to a drop in fish populations, with smaller fish more susceptible to predators.


Marine biologist, Dr Asta Audzijonyte of the CSIRO's Wealth from Oceans Flagship, and colleagues, reported their findings in the journal Royal Society Biology Letters.

Dr Audzijonyte says commercial fishing could be changing the long-term evolution of fish sizes.

She found that even small decreases in the body size of some fish species had a big impact on their population size, because it made fish more vulnerable to predators.

'So basically, if the flathead gets a bit smaller, it's being eaten more heavily by other fishes like barracuda, which is the predator of the flathead,' she explained.
The CSIRO study looked at five Australian fish species: Tiger flatheads, jackass morwong, silver warehou, blue grenadier and pink ling.

'We usually selectively catch the largest and the fastest-growing individuals, leaving the small ones in the ocean. So we only have the small ones left ... But then also, only the small ones get a chance to reproduce, and they are more likely to produce other small and slow-growing fish.

'So in this way, we are getting a long-term evolutionary decline in body size, which is more problematic because the fish will not get bigger quickly, even if we completely stop fishing, because they already became evolutionarily smaller.'

The scientists used a complex modelling system to test how the decreasing fish size affects the interactions between different species.

More at http://www.csiro.au/en/Organisation-Structure/Divisions/Marine--Atmospheric-Research.aspx
Hella Marine - July 2016Auckland On the Water Boat ShowGAC Pindar Freight

Related Articles

Brisbane Boat Show opens this week
The 2017 Brisbane Boat Show opens Friday and runs for three days until Sunday, returning once again to the Brisbane The 2017 Brisbane Boat Show opens Friday and runs for three days until Sunday, returning once again to the Brisbane Convention and Exhibition Centre in South Bank.
Posted on 22 Aug
Humpbacks feed in Rio del Mar
There is no doubt that whales are one of the spectacles of our planet. There is no doubt that whales are one of the spectacles of our planet. In both the Northern and Southern Hemispheres they stop onlookers, have organised tours and if you are one of those person just fortunate to simply come across them in their habitat, they reaffirm your faith in all things special.
Posted on 19 Aug
Airborne great white shark caught on video off Cape Cod
A fisherman off the coast of Orleans tried to reel in a catch only to have it snapped off the line by great white shark This is one that did not get away - A fisherman off the coast of Orleans (Massachusetts) tried to reel in a catch only to have it snapped off the line by a great white shark that jumped high out of the water. It happened in a split second, but the stunning moment was captured on video...
Posted on 19 Aug
Coast Guard oversees fuel spill cleanup in New Bedford Harbor
Coast Guard crews are overseeing a fuel spill cleanup in New Bedford Harbor Wednesday after a fishing vessel sank Coast Guard crews are overseeing a fuel spill cleanup in New Bedford Harbor Wednesday after a fishing vessel sank at the pier off Hervey Tichon Ave.
Posted on 17 Aug
State of the Gyres
Our oceans and waterways cannot absorb the amount of plastic going into them. Our oceans and waterways cannot absorb the amount of plastic going into them. Here's an update on the state of the gyres and a look at some of the ways we're trying to clean them up. Take a massive area of ocean. Add swirling currents from wind and the earth's rotation. Gradually mix in plastics of all types and sizes. Bake well under ultraviolet rays while stirring continuously for decades.
Posted on 16 Aug
Ferretti Yachts, Pershing and Riva appoint Indo dealers Yacht Sourcing
“It is our ambition that Yacht Sourcing becomes synonymous with the yachting lifestyle in Indonesia'. On 15 June 2017 Yacht Sourcing celebrated its appointment as Official Dealer of Ferretti Yachts, Pershing and Riva brands in Indonesia. The occasion was marked by a splendid reception in Bali, at the Métis Restaurant and Gallery on trendy Seminyak strip. More than 300 members of the international yachting industry, high society A-Listers and corporate and media personalities were present
Posted on 15 Aug
Simrad GO9 Chartplotter Display wins 'Best New Product of the Year'
The Simrad® GO9 display was recognized at the West Marine VIV Awards presented at this year’s 2017 VIV Conference. The Simrad® GO9 display was recognized at the West Marine Very Important Vendor (VIV) Awards presented at this year’s 2017 VIV Conference. The chartplotter was selected as the Best New Product of the Year, and Navico – parent company to the Simrad brand of marine electronics – was selected for driving Best Store Support.
Posted on 15 Aug
R Marine Sydney wins ‘Riviera and Belize Dealership Of The Year’ title
This years 50th Sydney International Boat Show marked several achievements for the leading Riviera and Belize dealership R Marine Sydney take home the prestigious ‘Riviera and Belize Dealership Of The Year’ title at the annual Riviera and Belize dealer awards night hosted during the Sydney International Boat Show. This year's 50th Sydney International Boat Show marked several achievements for the leading Riviera and Belize dealership in Australia. In addition,
Posted on 14 Aug
Whittley Boats, head to Queenscliff Harbour for boat show weekend
Whittley will be displaying a range of luxury cruisers, fishers and trailerable pleasure boats at Queenscliff Harbour Australia’s largest and most awarded fibreglass trailer boat brand, Whittley will be displaying a range of luxury sports cruisers, fishers and trailerable pleasure boats at the Queenscliff Harbour Saturday and Sunday the 14th and 15th of October. The display will feature Whittley boat models on the water at the harbour and also in the harbours retail precinct.
Posted on 14 Aug
Early-storms one indicator of active Atlantic hurricane season ahead
Today NOAA issued the scheduled update for its 2017 hurricane season outlook. Today NOAA issued the scheduled update for its 2017 hurricane season outlook. Forecasters are now predicting a higher likelihood of an above-normal season, and they increased the predicted number of named storms and major hurricanes. The season has the potential to be extremely active, and could be the most active since 2010.
Posted on 12 Aug