Effects of temperature on gastric evacuation rates in Sepia officinalis (Linnaeus, 1758) in laboratory conditions
Abstract:In this study, the gastric evacuation rates of cuttlefish (Sepia officinalis), fed a single meal of shrimp, Paleomonetes varians, were measured in the laboratory at four temperatures (15.5, 18, 21 and 23°C). Linear, square root, and exponential models were fitted to the percentage of the original meal remaining (ash free dry weight). The square-root model gave the best fit for experiments performed at 15.5°C and 18°C, whereas the exponential model gave the best fit for experiments carried out at 23°C. The square-root model showed an increase in the amount of food remaining after the fifth hour in all four experiments. There was a significant difference in gastric evacuation rates between the temperatures tested. Gastric evacuation rates were higher at higher temperatures (0.442 h−1 at 23°C) in comparison with lower temperatures (0.198 h−1 at 15.5°C, 0.212 h−1 at 18°C, and 0.323 h−1 at 21°C). Significant differences in gastric evacuation rates between size and maturation stage have been calculated for experiments performed at 23°C.
Document Type: Research Article
Publication date: July 1, 2002
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