Swimbladder Lipids of Five Species of Deep Benthopelagic Atlantic Ocean Fishes
Three deep benthopelagic fishes (Dicrolene intronigra, Bassozetus sp., and Barathrodemus iris) had a cholesterol and phospholipidrich foam in their swimbladders after rising from depths of 1,510–1,530 m in an otter trawl. Two other species (Synaphobranchus brevidorsalis and Aldrovandia gracilis), collected at the same or similar depths, lacked swimbladder foam but had cholesterol and phospholipids in the swimbladder wall. Despite the apparent presence of hyperbaric oxygen gas in the swimbladders of all species examined, fatty acids of the polar and neutral lipids in the swimbladders were highly unsaturated (72% to 89% unsaturation). Examination of the swimbladder foam ultrastructure of Bassozetus sp. and two species of Barathrodemus by electron microscopy revealed bilayer membrane as the only recognizable structure. The function of the lipidrich membranous material requires further clarification.
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Document Type: Short Communication
Publication date: 1978-01-01
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