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dc.contributor.authorSiriraksophon, Somboon
dc.contributor.authorMorinaga, Tsutomu
dc.date.accessioned2021-12-09T02:13:48Z
dc.date.available2021-12-09T02:13:48Z
dc.date.issued1996
dc.identifier.citationSiriraksophon, S., & Morinaga, T. (1996). Effect of background brightness on the visual contrast threshold of the Japanese common squid. Fisheries Science, 62(4), 534–537.en
dc.identifier.issn0919-9268
dc.identifier.urihttp://hdl.handle.net/20.500.12067/1741
dc.description.abstractThe visual contrast threshold of Japanese common squid was studied using contrast test boards newly equipped with on-off switches. This improved apparatus enabled us to judge exactly the jet-hit response of the squid under very low ambient lights. Background brightness was maintained at four light levels, the quantum irradiance ranging from 2.3×10-1 μEm-2 s-1 (equivalent to about 4.1 lx) to undetectable levels (darkness). The apparent contrast values of the test board ranged from 33.6 to zero (0). At the light levels of 2.3×10-1, 1.8×10-3, 8.0×10-5 μEm-2 s-1 and at dark, the contrast threshold values of the squid were estimated to be 0.007, 0.008, 0.014, and 0.025, respectively, increasing with decreasing irradiance. At dark, the threshold was approximately four-fold that obtained previously at 1.0 lx. These experiments suggest that the background brightness by which the contrast threshold of the squid is influenced is less than 1.8×10-3 μEm-2 s-1.en
dc.language.isoenen
dc.publisherJapanese Society of Fisheries Scienceen
dc.relation.urihttps://www.jstage.jst.go.jp/article/fishsci1994/62/4/62_4_534/_pdf
dc.subjectSquidsen
dc.subjectTodarodes pacificusen
dc.subjectcontrast thresholden
dc.subjectbackground brightnessen
dc.subjectjet-hit responseen
dc.titleEffect of background brightness on the visual contrast threshold of the Japanese common squiden
dc.typeArticleen
dc.citation.volume62
dc.citation.issue4
dc.citation.spage534
dc.citation.epage537
dc.citation.journalTitleFisheries Scienceen
dc.subject.asfaVisionen
dc.subject.asfaVisibility underwateren
dc.subject.asfaMarine molluscsen
dc.subject.asfaEnvironmental effectsen
dc.subject.asfaLight stimulien
dc.subject.asfaBehavioural responsesen
dc.identifier.essn1444-2906
dc.identifier.doi10.2331/fishsci.62.534


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  • Journal Articles [9]
    These papers were contributed by SEAFDEC/TD staff to various national and international journals

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