There are more fish in the “twilight” zone near the Antarctic than we thought

There are more fish in the “twilight” zone near the Antarctic than we thought

Source: zmescience

4/6/2022

Credit: Tracey Dornan

There’s plenty of fish in the sea… but how many, exactly? How do you go about counting the number of fish in the sea, especially in remote areas like the “twilight” zone (200-1000 meters below sea level) of the Southern Ocean, close to Antarctica? Obviously, going at it one by one is not an efficient approach. So instead, researchers try something else: echo sounding

An echosounder sends out an acoustic pulse and when the pulse encounters something with different physical properties than the space around it, it is reflected back to the receiver. The fishes’ swim bladders, the gas-filled organs they use for buoyancy, are particularly sensitive to these pulses and offer very good reflectors.

Continue...

News Id		Source	Stamp	country
2476	Kiwi Angler Catches Massive 30.31-Pound Potential Line Class World Record Rainbow Trout	fieldandstream	2022-08-29	NZ
2477	Half of fish tested in an Amazon river have unsafe levels of mercury	newscientist	2022-08-31	BZ
2478	Illegal fishing, worker abuse claims leave a bad taste for Bumble Bee Seafood	mongabay	2022-09-02	TW
2479	Ghostly sea creature which is almost totally transparent drags fish to their doom	mirror	2022-08-11	MX
2480	Blue-green mouth fish found in New Mexico lake	msn	2022-08-26	MX
2481	Urgent action on climate change needed to rebuild fish stocks	ctv news	2022-09-04	CA
2482	Irish researchers study evolutionary potential of Atlantic salmon	The Fish Site	2022-09-07	IR
2483	Lice rules to change for ASC-certified salmon farms	The Fish Site	2022-09-06	CA
2484	Recreational fishing in La. under attack, Landry says	americanpress	2022-08-25	US
2485	Fisheries dept says noose tightened around fishermen indulging in LED fishing and other banned practices	digitalgoa	2022-08-23	IN
2486	Monster fish eludes capture as Chinese city	msn	2022-08-25	CN
2487	Mark McGowan defends WA recreational fishing ban	The West Australian	2022-08-21	AU
2488	Biggest fish ever caught in Massachusetts	wwlp	2022-07-25	US
2489	Chicopee man catches record size fish in Connecticut	wpri	2022-08-23	US
2490	Monster cannibal fish in French rivers, but no threat to humans	connexion france	2022-08-22	FR
2491	Okanagan First Nation fishery celebrates record return of sockeye salmon	msn	2022-09-04	CA
2492	AI-enabled fish gate filters invasive salmon out of Norwegian waterways	newatlas	2022-08-26	NO
2493	Poles hold “marches of mourning” for poisoned Oder river while anglers mobilise to save fish	notesfrompoland	2022-08-23	PL
2494	One of the World’s Rarest Fish Swims Upside Down While Hunting	fieldandstream	2022-08-25	DM
2495	US army builds electric barrier of death to stop rampaging fish destroying Great Lakes	dailystar	2022-08-26	US
2496	A pair of crocodile gars in Ruzhou, Henan, watched by millions of netizens for nearly a month	breakinglatest	2022-08-27	CN
2497	Dead fish and depression on the banks of Poland’s Oder River	AFP	2022-08-27	PL
2498	Novel tech helps detect roundworms in fish fillets	The Fish Site	2022-09-03	US
2499	Turning invasive copi into live feed for yellow perch	The Fish Site	2022-09-01	US
2500	China delivers world's first 100,000-tonne 'mobile fish farm'	cgtn	2022-05-20	CN