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As we age, man's memory also weakens, but a fish called "cutlefish" (Cuttlefish) remembers all the events of its life completely until it dies.
The discovery itself is surprising to scientists because the cutlefish are counted among small fish ranging in age from one to two years, while the general size is only 6 to 10 inches. The largest species of cutelfish are also only 20 inches long.
Experts have known about the good memory of the cutlefish for years, but the study on 24-bowl fish has revealed that the memory of this little fish is surprisingly strong and durable.
American, British and French experts have conducted this joint research on the common cutlefish (Sepia officinalis), the results of which have been published online in the latest issue of ''Processings of the Royal Society B/Biological Sciences''.
Half of the cutle fish used in this study were 10 to 12 months (about middle age) while the other half were 24 months old (i.e. good old).
All these fish were tested for ''incidental memory'' (episodic-like memory) by going through various experiments on finding food and remembering food availability information.
It should be noted that in humans , "incidental memory" refers to remembering what they were, where they took place and when they happened.
In other animals, including fish, almost the same capacity is called ''incidental memory'' (episodic like memory).
In the first phase of these experiments, these fish were trained to find two types of foods.
One of them was the grass shrimap (a small-size, prawn-like marine animal), the favorite food for the cattle fish, while the other was the king prana, a large-sized shrimp, and which the cattle eat very little.
The results showed that the cutofffish of all ages not only remembered the way and way to reach the diet very quickly, but also remembered their previous experience very well when they had spent much time again with the same experiments.
It was more striking than the memory of the "old" cutle fish, the young cutel fish.
A part of the brain ''hippocampion'' plays a very important role in memory formation and safety, but this part is also not present in the cutel fish.
Nevertheless, these minor fish remember their events all their lives; and this memory weakens just two or three days before they die.
The powerful and strong memory of the cutlefish until the late age, experts believe that they mix for ethnicity in the last months of their age; and perhaps that is the secret to their memory.
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