Pineal organs of deep-sea fish: photopigments and structure.
Reads0
Chats0
TLDR
The morphology and photopigments of the pineal organs from a number of mesopelagic fish, including representatives of the hatchet fish, scaly dragon-fish and bristlemouths, were examined, and two spectral classes of pinealocyte were identified, both spectrally distinct from the retinal rodphotopigment.Abstract:
We have examined the morphology and photopigments of the pineal organs from a number of mesopelagic fish, including representatives of the hatchet fish (Sternoptychidae), scaly dragon-fish (Chauliodontidae) and bristlemouths (Gonostomidae). Although these fish were caught at depths of between 500 and 1000 m, the morphological organisation of their pineal organs is remarkably similar to that of surface-dwelling fish. Photoreceptor inner and outer segments protrude into the lumen of the pineal vesicle, and the outer segment is composed of a stack of up to 20 curved disks that form a cap-like cover over the inner segment. In all species, the pineal photopigment was spectrally distinct from the retinal rod pigment, with lambdamax displaced to longer wavelengths, between approximately 485 and 503 nm. We also investigated the pineal organ of the deep demersal eel, Synaphobranchus kaupi, caught at depths below 2000 m, which possesses a rod visual pigment with lambdamax at 478 nm, but the pineal pigment has lambdamax at approximately 515 nm. In one species of hatchet fish, Argyropelecus affinis, two spectral classes of pinealocyte were identified, both spectrally distinct from the retinal rod photopigment.read more
Citations
More filters
Journal ArticleDOI
Melatonin activates brain dopaminergic systems in the eel with an inhibitory impact on reproductive function.
Marie-Emilie Sébert,C. Legros,Finn-Arne Weltzien,Finn-Arne Weltzien,Benoît Malpaux,Philippe Chemineau,Sylvie Dufour +6 more
TL;DR: The results of the present study provide the first evidence that melatonin enhances TH expression in specific brain regions in a non‐mammalian species, and could represent one pathway by which environmental factors could modulate reproductive function in the eel.
Journal ArticleDOI
Differential light intensity and spectral sensitivities of Atlantic salmon, European sea bass and Atlantic cod pineal glands ex vivo.
TL;DR: The first evidence of relative photoreception in teleosts was obtained in cod suggesting that the definition of illuminance thresholds (day/night perception) would depend on the day intensity, and a single order of magnitude increase or decrease in day intensity was shown to elicit a significant shift in the intensity response curve of night-time melatonin suppression.
Journal ArticleDOI
Activity rhythms in the deep-sea: a chronobiological approach.
Jacopo Aguzzi,Corrado Costa,Paolo Menesatti,José A. García,Nixon Bahamon,Pere Puig,Francesc Sardà +6 more
TL;DR: This review will focus on the behavioural rhythms of crustacean decapods inhabiting depths where the sun light is absent, and potential scenarios for future research on deep-sea decapod behaviour are suggested by new in situ observation technologies.
Journal ArticleDOI
A Novel Morphometry-Based Protocol of Automated Video-Image Analysis for Species Recognition and Activity Rhythms Monitoring in Deep-Sea Fauna
Jacopo Aguzzi,Corrado Costa,Yoshihiro Fujiwara,Ryoichi Iwase,Eva Ramirez-Llorda,Paolo Menesatti +5 more
TL;DR: A morphometry-based protocol for automated video-image analysis where animal movement tracking (by frame subtraction) is accompanied by species identification from animals' outlines by Fourier Descriptors and Standard K-Nearest Neighbours methods is elaborated.
Journal ArticleDOI
Rhythms at the bottom of the deep sea : Cyclic current flow changes and melatonin patterns in two species of demersal fish
TL;DR: Observations strongly suggest that biological rhythms are present in demersal fish, the melatonin metabolism shows signs of periodicity, and tidal currents may act as zeitgeber at the bottom of the deep sea.
References
More filters
Journal ArticleDOI
Vertebrate Ancient-Long Opsin: A Green-Sensitive Photoreceptive Molecule Present in Zebrafish Deep Brain and Retinal Horizontal Cells
TL;DR: The existence of VAL-opsin, a new member of the rhodopsin superfamily, in these tissues may indicate its multiple roles in visual and nonvisual photosensory physiology.
Journal ArticleDOI
The eyes of deep-sea fish. i: lens pigmentation, tapeta and visual pigments
TL;DR: This paper summarises the reflective properties of the ocular tapeta often found in deep-sea fish, the pigmentation of their lenses and the absorption characteristics of their visual pigments, and highlights three genera of stomiid dragonfishes, which uniquely produce far red bioluminescence from suborbital photophores.
Journal ArticleDOI
Exo-rhodopsin: a novel rhodopsin expressed in the zebrafish pineal gland
TL;DR: Cahill et al. as mentioned in this paper reported identification of a novel opsin gene expressed in the zebrafish pineal gland, which has an endogenous circadian pacemaker entrained to environmental light-dark cycles.
Journal ArticleDOI
Parapinopsin, a Novel Catfish Opsin Localized to the Parapineal Organ, Defines a New Gene Family
Seth Blackshaw,Solomon H. Snyder +1 more
TL;DR: No expression of retinal opsins in pineal and parapineal organ and no expression of any opsin tested in the “deep brain,” iris, or dermal melanophores imply that phototransduction in these sites of extraretinal photoreception must be mediated by novel opsins.
Journal ArticleDOI
Visual pigments of deep-sea fish.
E. J. Denton,F. J. Warren +1 more
TL;DR: Experiments have been made on board R.V. Sarsia with the fresh retinæ of four species of deep-sea fish caught in the Bay of Biscay, finding that these species, Stomias boa, Flagellostomias sp.
Related Papers (5)
Evolution of photosensory pineal organs in new light: the fate of neuroendocrine photoreceptors
Peter Ekström,Hilmar Meissl +1 more