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Ultraviolet blocking in the ocular humors of the teleost fish Acanthocybium solandri (Scombridae)

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Abstract:

The humors of the eye of the pelagic predator Acanthocybium solandri (the wahoo or ono) absorb ultraviolet-A radiation of longer wavelength than that absorbed by the lens. Except for a single juvenile fish, the 50% transmission cutoff for lenses of about 1 cm diameter were of a shorter wavelength than the cutoff for 2–3 mm thick samples of the humors. The lens showed more absorption than the humors below 340 nm but lacked much of the ca. 360 nm absorption found in the humors. Related and ecologically similar fish show the more normal condition, with the lens as the primary short-wavelength filter. The functional significance of this design is obscure.

Les humeurs de l'oeil du prédateur pélagique Acanthocybium solandri (Wahoo ou Ono) absorbent les ultraviolets A de longueurs d'onde supérieures à celles qui sont absorbées par le cristallin. Sauf dans le cas d'un seul poisson juvénile, le seuil de transmission de 50 % pour des cristallins d'environ 1 cm de diamètre se situait à une longueur d'onde plus courte que celle enregistrée pour des échantillons d'humeurs de 2 à 3 mm d'épaisseur. Le cristallin absorbe plus que les humeurs sous 340 nm, mais la capacité d'absorption à ca. 360 nm que l'on trouve dans les humeurs lui fait en grande partie défaut. Chez des poissons apparentés et des poissons semblables écologiquement, on retrouve la condition plus normale dans laquelle le cristallin est le principal filtre des longueurs d'onde courtes. Le rôle fonctionnel de ce système reste obscur.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2001

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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