{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T16:11:09Z","timestamp":1791994269024,"version":"4.4.0"},"reference-count":30,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2002,12,24]],"date-time":"2002-12-24T00:00:00Z","timestamp":1040688000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Exp. Zool."],"published-print":{"date-parts":[[2003,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The pineal window is a transparent\/translucent pineal covering on the dorsal surface of the cranium of certain fishes and is associated with light reactions of fish. In the present study, catfish species <jats:italic>Clarias batrachus<\/jats:italic>, <jats:italic>Heteropneustes fossilis<\/jats:italic>, <jats:italic>Mystus vittatus<\/jats:italic>, <jats:italic>M. seenghala<\/jats:italic>, and <jats:italic>M. cavassius<\/jats:italic> were examined for the type of pineal window present. Two morphologically different types of pineal window were found: an opaque\u2010looking pineal window in <jats:italic>C. batrachus<\/jats:italic> and <jats:italic>H. fossilis<\/jats:italic> and a translucent type of pineal window in <jats:italic>M. vittatus<\/jats:italic>, <jats:italic>M. seenghala<\/jats:italic>, and <jats:italic>M. cavassius<\/jats:italic>. The distributional pattern of pigments in the melanophores at the pineal window were studied in terms of Melanophore Index (MI). In all of the species studied, a pineal foramen, a subepidermal lens\u2010like tissue, and pineal end vesicle were present.<\/jats:p><jats:p>Experiments were carried out on catfish having the opaque pineal window, as it is uncommon in catfish. Catfish with normal and shielded pineal window were exposed to conditions of artificial constant illumination (LL) and darkness (DD) to evaluate the effects of altered photoperiods on the state of pigmentation of melanophores at the pineal window. Recordings of diel activity patterns, which are light dependent in catfish, were carried out under both natural and artificial photoperiods in fish with a normal or shielded window in order to assess its functional nature. The existence of two morphologically and functionally different types of pineal window in a relatively closely related group of catfish has been demonstrated in this study. The nature of the opaque type of pineal window has been reconsidered based on new experimental evidence. <jats:italic>J. Exp. Zool. 295A:17\u201328, 2003<\/jats:italic>. \u00a9 2003 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jez.a.10210","type":"journal-article","created":{"date-parts":[[2002,12,31]],"date-time":"2002-12-31T01:00:47Z","timestamp":1041296447000},"page":"17-28","source":"Crossref","is-referenced-by-count":6,"title":["Two morphological types of pineal window in catfish in relation to photophase and scotophase activity: a morphological and experimental study"],"prefix":"10.1002","volume":"295A","author":[{"given":"S.","family":"Srivastava","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2002,12,24]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"104","article-title":"The structure of pineal window in the catfish, Heteropneustes fossilis (Bloch.), with special reference to melanophore activity","volume":"100","author":"Agha AK","year":"1986","journal-title":"Z mikrosk Anat Leipzig"},{"key":"e_1_2_1_3_1","first-page":"2303","volume-title":"Traite de Zoologie Tome XIII. 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