Cichlids and stingrays can add and subtract ‘one’ in the number space from one to five

Cichlids and stingrays can add and subtract ‘one’ in the number space from one to five

By V. Schluessel, N. Kreuter, I. M. Gosemann & E. Schmidt

Source: nature

3/31/2022

The numerical understanding of cichlids and stingrays was examined regarding addition and subtraction abilities within the number space of one to five. Experiments were conducted as two-alternative forced-choice experiments, using a delayed matching to sample technique.

On each trial, fish had to perform either an addition or subtraction, based on the presentation of two-dimensional objects in two distinct colors, with the color signaling a particular arithmetic process. Six cichlids and four stingrays successfully completed training and recognized specific colors as symbols for addition and subtraction.

Continue...

News Id		Source	Stamp	country
3301	Из-за чего цены на щучью икру в Астрахани взлетели?	Рыболовство	2021-06-01	RU
3302	Куда пошла рыба, которую не смогли экспортировать в АТР?	korabel	2021-12-29	RU
3303	Warmer, oxygen-poor waters threaten world’s ‘most heavily exploited’ fish	mongabay	2022-01-06	PE
3304	Tiny but mighty important: What a small fish can tell you about the health of our rivers	newschannel9	2022-01-07	US
3305	Australian writer seeks information on Texarkana falling fish phenomenon	texarkanagazette	2022-01-08	AU
3306	Mississippi fishermen find themselves caught after agents say they were over limit by 152 fish	magnoliastatelive	2022-01-09	US
3307	Four swimmers are found dead and covered in bites after spate of terrifying PIRANHA attacks in Paraguay	dailymail	2022-01-06	PY
3308	Indonesia aims for sustainable fish farming with ‘aquaculture villages’	mongabay	2022-01-07	ID
3309	Alaskan fishers intercepting B.C. salmon at 'jarring' rate	delta-optimist	2022-01-11	US
3310	So you caught a fish in Kansas, is it safe to eat?	KSNW	2022-01-03	US
3311	An 'amazing week': Idaho Fish & Game researchers hook three 10-foot sturgeon	ktvb7	2022-01-04	US
3312	Sustainable fishing by 2025: What is the current situation in Indonesia?	dw	2022-01-10	ID
3313	In Norway, Kids Slice Out Cod Tongues for Serious Money	smithsonianmag	2022-01-12	NO
3314	After 33 years, Fish Radio's Laine Welch hangs up her mic	KDLG 670AM	2022-01-08	US
3315	Spanish Party Calls for Demolition of Morocco’s Fish Farm Near Chafarinas Islands	moroccoworldnews	2022-01-03	MA
3316	Tribe works to keep home of endangered fish free of invasive species	nevadacurrent	2022-01-03	US
3317	Local fisherman reels in possible world record haul off coast of St. Augustine	news4jax	2021-12-28	US
3318	Biodiversity: The tale of the 'un-extinct' fish	bbc	2021-12-29	MX
3319	Delta pumps throttled back despite rains, cutting California water deliveries to protect fish	sacbee	2022-01-01	US
3320	Fish fall from the sky during rain in east Texas, city reacts	kxxv	2022-01-04	US
3321	Israeli scientists train goldfish to steer car around room	timesofisrael	2022-01-03	IL
3322	Removing barriers to fish passage	newportnewstimes	2021-12-29	US
3323	Seawatch: Alaska had a tumultuous fishing year	Homer News	2021-12-29	US
3324	Ice Age Canadian Lakes	earthobservatory	2022-01-21	CA
3325	Jordan orders gates opened on Avon River to allow fish passage	saltwire	2021-03-23	CA

132 of [136 - pages.]