Abstract
Both living and dead specimens of the Gulf of Mexico anacanthine fish Steindachneria argentea were injected with a 1:1,000 solution of adrenalin chloride. In some instances luminescence was induced. The skin of areas observed to luminesce has a distinctive, striated pattern of pigment distribution. Similar skin has been reported from the macrourid genus Hymenocephalus and 3 species of the family Trachichthyidae, of which one, Paratrachichthys prosthemius, is known to be luminescent. A luminous organ is present in the body wall where it forms a ring around the anus which is located anteriorly between the bases of the ventral fins. An elongate cavity filled with gelatinous tissue extends posteriorly from the anus to the origin of the anal fin. Gelatinous tissue is also found beneath virtually all striated skin. The ventral part of the hypaxial muscle mass is modified into a structure to reflect and diffuse light.
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