| Autor: |
Hernandez-Cortes, P., Quadros-Seiffert, W., del Toro, M. A. Navarrete, Portillo, G., Colado, G., Garcia-Carreño, F. L. |
| Zdroj: |
Journal of Applied Aquaculture; Jan1999, Vol. 9 Issue 1, p35-45, 11p |
| Abstrakt: |
Juvenile white shrimp, Penaeus vannamei, were studied using tray feeders in relation to food ingestion and enzymatic activity, with data taken every two hours for five days. The feed ingestion was calculated by subtracting the uningested and the leached material from the food provided. Significant differences (P < 0.05) in the ingestion rate were found during the experiment. The greatest ingestion occurred between 2000 and 2200 hours. The largest feed ingestion coincided with the nocturnal activity of shrimp. Time-series analysis showed a cycle of increased ingestion before midnight and lower ingestion during daylight. Total protease, trypsin, and chymotrypsin activity were measured during the last 24 hours of the study and included both fed and starved organisms. The enzymatic pattern was similar for both groups. There was a decrease of the protease and trypsin activities before and after 1800 hours, just before the ingestion increased. The study of digestive enzymes provided evidence of a close association between behavior and regulation of the digestion system physiology. The results give some clues toward better feeding regimens and the use of feed management for continual monitoring of ingestion to get reliable evaluations for food conversion index. Feed management with tray feeders will reduce pollution in extensive ponds by decreasing the uningested food. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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