caa a22 4500 605542775 CHVBK 20210128100923.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10071-014-0815-3 doi (NATIONALLICENCE)springer-10.1007/s10071-014-0815-3 Something worth remembering: visual discrimination in sharks [Elektronische Daten] [Theodora Fuss, Vera Schluessel] This study investigated memory retention capabilities of juvenile gray bamboo sharks (Chiloscyllium griseum) using two-alternative forced-choice experiments. The sharks had previously been trained in a range of visual discrimination tasks, such as distinguishing between squares, triangles and lines, and their corresponding optical illusions (i.e., the Kanizsa figures or Müller-Lyer illusions), and in the present study, we tested them for memory retention. Despite the absence of reinforcement, sharks remembered the learned information for a period of up to 50weeks, after which testing was terminated. In fish, as in other vertebrates, memory windows vary in duration depending on species and task; while it may seem beneficial to retain some information for a long time or even indefinitely, other information may be forgotten more easily to retain flexibility and save energy. The results of this study indicate that sharks are capable of long-term memory within the framework of selected cognitive skills. These could aid sharks in activities such as food retrieval, predator avoidance, mate choice or habitat selection and therefore be worth being remembered for extended periods of time. As in other cognitive tasks, intraspecific differences reflected the behavioral breadth of the species. Springer-Verlag Berlin Heidelberg, 2014 Elasmobranch nationallicence Chiloscyllium griseum nationallicence Visual memory nationallicence Memory retention nationallicence Visual discrimination nationallicence Optical illusion nationallicence Fuss Theodora Institute of Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 169, 53115, Bonn, Germany aut Schluessel Vera Institute of Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 169, 53115, Bonn, Germany aut Animal Cognition Springer Berlin Heidelberg 18/2(2015-03-01), 463-471 1435-9448 18:2<463 2015 18 10071 https://doi.org/10.1007/s10071-014-0815-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10071-014-0815-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fuss Theodora Institute of Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 169, 53115, Bonn, Germany aut NATIONALLICENCE 700 1- Schluessel Vera Institute of Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 169, 53115, Bonn, Germany aut NATIONALLICENCE 773 0- Animal Cognition Springer Berlin Heidelberg 18/2(2015-03-01), 463-471 1435-9448 18:2<463 2015 18 10071