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Perales García, N., D., Tovar Ramírez, M.G., Martínez Morales, B.P., Ceballos-Vázquez, D., Corona-Rojas, M.A., Salcedo Meza, A., Garrido Mora & F., Vega Villasante (2024). pH in the digestive tract of the pygmy octopus Paroctopus digueti. Aquaculture America 2024. Estados Unidos de América, febrero 18 - 21, 2024, 1.

pH in the digestive tract of the pygmy octopus Paroctopus digueti

Natalia Perales García 1, Dariel Tovar Ramírez 1, María Guadalupe Martínez Morales 2, Bertha Patricia Ceballos-Vázquez 3, Daniela Corona-Rojas 1, Miguel Angel Salcedo Meza 4, Arturo Garrido Mora 4 y Fernásndo Vega Villasante 5

1 Centro de Investigaciones Biológicas del Noroeste
2 Instituto Politécnico Nacional, Cicimar
3 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Cicimar
4 Universidad Juárez Autónoma de Tabasco
5 Universidad de Guadalajara
Thisstudy is considered the first report on the digestive tract pH of the pigmyoctopus (Paroctopusdigueti). Adult octopuses obtained from the wild(mean ±SD) (42.1 ±15.1 g), and those acclimated to captivity in a fed (25.4±9.0 g, n=15) or fasted (23.1 ±6.1 g, n=15) state, were studied. The digestivetract regions of buccal mass (BMA), anterior salivary glands (ASG), posteriorsalivary glands (PSG), crop (CRO), stomach (STO), caecum (CAE), digestive gland(DGL) and intestine (INT) were dissected. The pH of the internal part of thedigestive tract regions was measured. Food intake (dry weight) per octopus was53.8 ±35.1 mg to 214.9 ±157.6 mg at 15 min and 8 hours, respectively. Theapparent food transit time was approximately 8 h for the appearance of feces inthe posterior intestine. In all cases, the pH of the digestive tract regionswas lower than pH 7.0. No statistical difference was found when comparing thepH by digestive tract regions between wild octopuses and octopuses in captivity(fasting and feeding). In acclimatized octopuses, the average pH was 6.41 ±0.22and 6.41 ±0.23 for fasting and fed octopuses, respectively. Although DGL hadthe lowest pH values relative to other digestive tract tissues (p < 0.05),pH was always greater than 5.0 (6.04 ±0.12 in the wild and 5.97 ±0.17 infeeding octopuses). In conclusion, the pygmy octopus has an acidic pH in itsdigestive tract under fasting and feeding conditions.

Palabras clave: Octopus; Paroctopusdigueti; Digestive transit; digestive tract; Lumen pH

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