Abstract
Abstract 1. 1. The cardinal snapper, Pristopomoides macropthalmus, collected from 500 m depth off Jamaica, had 4.0–4.4% lipid in its neurocranium and vertebral centra, comprised of 85–86% triacylglycerol. 2. 2. The rare arrowtail, Melanonous zugmayeri, from 1000 m depth, had 1.3–1.8% lipid in these same tissues, comprised of 47.6–76.7% triacylglycerol. 3. 3. Fatty acids of these deep fish when compared with two shallow reef herbivores, Acanthurus bahianus and A. chirurgus, were enriched in polyunsaturated fatty acids, particularly 22:6ω3, 20:5ω3, and 16:4ω3/ω1. 4. 4. Monounsaturated fatty acids in Melanonous zugmayeri were 31.7–46.3% of the total fatty acids and were dominated by 18:1ω9 + 11 and 20:1. 5. 5. Monounsaturated fatty acids in the Acanthurus species were 27.0–36.4% and 23.3–30.7% in the bigeye, Priacanthus arenatus, a nocturnal carnivore from 25 m depth. 6. 6. The principal monounsaturated fatty acid in Acanthurus spp. was 16:1ω7 (8.7–24.6%) whereas P. arenatus was similar to the two deep fish with respect to monounsaturated fatty acids and polyunsaturated fatty acids. 7. 7. Fatty acid composition of P. arenatus is probably controlled by its diet consisting of larval forms from deeper colder water.
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