Physiological Impairment as a Result of Bile Accumulation in an Apex Predator, the Tiger Shark (Galeocerdo cuvier Péron & Lesueur, 1822)

• Published in: Animals (Basel) Vol. 10; no. 11; p. 2030
• Main Authors: Wosnick, Natascha, Chaves, Ana Paula, Niella, Yuri Vieira, Takatsuka, Veronica, Hazin, Fábio Hissa Vieira, Nunes, Jorge Luiz Silva, Morick, Danny
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2020; MDPI
• Subjects: absorption; Animals; Bile; bile secretion; Coasts; diet; fasting; Fisheries; Fishing; Galeocerdo cuvier; Gallbladder; hepatobiliary alteration; juveniles; Lipids; Liver; Metabolism; Physiological aspects; physiological markers; Physiology; Sharks; starvation; Triglycerides; Vertebrates; Brazil
• ISSN: 2076-2615; 2076-2615
• DOI: 10.3390/ani10112030

Physiological adaptations have evolved to help sharks face rapid periods of feast. Tiger sharks are generalist apex predators that rely on a high-lipid/protein diet. To achieve a satisfactory nutritional condition, proper lipid absorption and hepatic storage are needed. Bile secretion in sharks is low and sporadic but increases during short periods of fasting. The present study describes a physiological impairment caused by bile accumulation in juvenile tiger sharks, possibly due to prolonged fasting. These evidences suggest that, even though sharks have adaptations that prevent them from dying from starvation, alarming physiological alterations might occur. Future studies are needed to assess how such a condition can affect wild populations, as well as possible sublethal consequences that could impact their long-term survival.