The effect of pinealectomy, continuous light, and continuous darkness on metamorphosis of anadromous sea lampreys, Petromyzon marinus L

Journal Article · Tue Dec 01 00:00:00 EST 1981 · J. Exp. Zool.; (United States)

DOI:https://doi.org/10.1002/jez.1402180311· OSTI ID:6929442

Cole, W C; Youson, J H

The role of the pineal complex in lamprey metamorphosis was investigated by examining the influence of pinealectomy and continuous light and darkness on the initiation of this event in anadromous sea lampreys, Petromyzon marinus L. Larval lampreys, which on the basis of a condition factor were considered likely to enter metamorphosis in July, were separated in May of 1979 and 1980 into the following groups: (1) intact controls, (2) sham-operated controls, (3) pinealectomized individuals, (4) those exposed to continuous light, and (5) those exposed to continuous light or dark. The importance of the pineal complex to metamorphosis was supported by morphological evidence that, in all presumably pinealectomized individuals that entered metamorphosis, the complex had apparently not been removed during the surgical procedure. The ways in which the pineal complex may be involved in lamprey metamorphosis are discussed.

• Research Organization: Department of Zoology and Scarborough College, University of Toronto, Ontario, Canada
• OSTI ID: 6929442
• Journal Information: J. Exp. Zool.; (United States), Vol. 218:3
• Country of Publication: United States
• Language: English

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59 BASIC BIOLOGICAL SCIENCES
PINEAL GLAND
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DAILY VARIATIONS
LARVAE
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ONTOGENESIS
SURGERY
VISIBLE RADIATION
ANIMALS
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