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Photo-regulation of the hatching process of halibut (Hippoglossus hippoglossus) eggs

✍ Scribed by Helvik, Jon V. ;Walther, Bernt T.

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
613 KB
Volume
263
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Hatching occurs in all vertebrates, yet knowledge about the control of this developmental transition is incomplete. Incubation of halibut Hippoglossus hippoglossus eggs in light results in sustained inhibition of hatching. The inhibitory efficacy of light is affected both by its intensity and its colour. Transfer of hatching‐arrested eggs to darkness (0.1 lux and below) reverses such inhibition and causes hatching of all eggs between 80–140 min later. Darkness is only required during the first 60 min of this induced hatching and initiates a signal which makes hatching irreversible and darkness independent. The darkness‐generated signal ultimately causes release of hatching enzyme, which digests the zona radiata so that the eggshell may be mechanically opened by the larva. We conclude that light serves as a natural cue for hatching in halibut eggs, and that halibut larvae in nature hatch in darkness. © 1992 Wiley‐Liss, Inc.

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