Timing of digestion, absorption and assimilation in octopus species from tropical (Octopus maya) and subtropical-temperate (O. mimus) ecosystems

Aquatic Biology

Cristina Pascual¹  Oscar Zúñiga¹  Marcela Linares¹  Alberto Olivares¹  Pedro Gallardo¹  Claudia Caamal-Monsreal¹  Ariadna Sánchez¹  Carlos Rosas¹  Sergio Rodríguez¹ 

关键词: Octopus maya;    Octopus mimus;    Digestive physiology;    Digestion timing;    Enzyme activity;    Gastric juice;    Free amino acid pool;    Hemolymph;   

DOI  :  10.3354/ab00642

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Culture of octopuses is still in an experimental stage due to a lack of knowledge about their digestive physiology. This study aimed to determine the temporality of nutrient digestion, absorption and assimilation in 2 species of octopus: the tropical Octopus maya (habitat temperature 22 to 26°C) and the subtropical-temperate O. mimus (15 to 21°C). In both species, the chyme volume displayed 2 peaks over time along the digestive tract: one at the beginning of digestion and a second at the end of the digestion process. These phases were observed in gastric juice (GJ) enzymes, in the flow of nutrients in the digestive gland (DG), in the appearance of metabolites in the hemolymph, and in muscle protein and glycogen levels. The soluble nutrient flow throughout the digestive tract into the DG was similar in both species. However, intracellular digestion was different in O. mimus compared to O. maya; lipids were mobilized faster than proteins in O. mimus, whereas proteins were mobilized faster than lipids in O. maya. This suggests that at low temperatures, the mobilization of lipids could be a biological priority due to their role in membrane protection. In addition, O. mimus displayed more digestive enzyme activity in the GJ and DG compared with O. maya, suggesting that adaptive differences may be related to environmental temperatures.

【 授权许可】

Unknown