Literaturdatenbank
Literaturdatenbank |
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Zhang, Y.-P., Du, W.-G., Shen, J.-W., & Shu, L. (2009). Low optimal temperatures for food conversion and growth in the big-headed turtle, platysternon megacephalum. Aquaculture, 295(1-2), 106–109.
Added by: Admin (21 Nov 2009 11:53:26 UTC) |
| Resource type: Journal Article BibTeX citation key: Zhang2009 View all bibliographic details  |
Categories: General Keywords: Haltung = husbandry, Platysternidae, Platysternon, Platysternon megacephalum, Schildkröten = turtles + tortoises Creators: Du, Shen, Shu, Zhang Collection: Aquaculture |
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| Abstract |
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We held juvenile big-headed turtles, Platysternon megacephalum, from eastern China, at temperatures from 20 to 29.4 °C to determine effects on feeding, growth and food conversion. Food intake increased significantly from 20 to 22.4 °C, remained high until 27.1 °C, and then decreased dramatically at 29.4 °C. Digestive efficiency for energy decreased as temperature increased, whereas the digestive efficiency of protein increased from 20 to 25 °C, and decreased at higher temperatures. The relationships between specific growth rate (SGR), food conversion coefficient (Cc) and temperature (T) were curvilinear, and could be described by quadratic equations: SGR = −0.01 T2 + 0.47 T − 5.24 and Cc = −0.37 T2 + 17.20 T − 181.85. Maximum growth was estimated to occur at 23.9 °C, with 90% of the maximum being achieved within the range of 21.9–25.8 °C; maximal food conversion occurred at 23.2 °C, with a 90% range from 21.0 to 25.4 °C. The temperature range (22–25 °C) found to promote best growth and food conversion in juvenile P. megacephalum is lower than for many other freshwater turtles. Temperatures of 22–25 °C are recommended for use in culture of this species to maximize growth and food conversion.
Added by: Admin |