Abstract

GOMEZ-PENARANDA, José Ader  and  CLAVIJO-RESTREPO, Laura Cristina. Determination of the stomach emptying time of tilapia Oreochromis sp. using different weekly feeding frequencies and starvation. Acta Agron. [online]. 2012, vol.61, n.3, pp.239-243. ISSN 0120-2812.

The study measured the time necessary to complete emptying of the stomach of tilapia (Oreochromis sp.) starting on the day subsequent to regular feeding a fasting period. Samples were collected from stomach contents in periods of 2 hours after feeding (9:30 and 15:30 h) until the first sign of emptying. The tilapia weighing was 150±10 g; designing four treatments: (1) T5 = feed to satiation for 5 days and fasting for two days (T5), (2) T6 = feed to satiation for 6 days and fasting for one day, (3) T7 = feed to satiation for 7 days, and (4) TC= restricted feeding table recommended by the manufacturer, 7 days a week. Data analysis was performed using repeated measures ANOVA, using as factors the treatment and emptying time, with each repetition as the experimental unit. Unlike the T5 treatment, in other tilapia emptied its contents into the stomach from the time period between the first and the second ration of food and in the period after the second ration. Therefore, when the stomach content was higher due to a higher feed intake in the diet, as in the case of treatment (T5), the time required to empty the stomach of tilapia increased.

Keywords : Evacuation; ingest; ration; satiety; starvation; tilapia.

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