Effects of stocking density and algal concentration on the survival,growth and metamorphosis of Bobu Ivory shell,Babylonia formosae habei (Neogastropoda: Buccinidae) larvae |
| |
Authors: | Huaiping Zheng Caihuan Ke Zewen Sun Shiqiang Zhou Fuxue Li |
| |
Institution: | 1. State Key Laboratory of Marine Environmental Science, Department of Oceanography, Xiamen University, Xiamen, China
Mariculture Research Center for Subtropical Shellfish & Algae, Shantou University, Shantou, China;2. State Key Laboratory of Marine Environmental Science, Department of Oceanography, Xiamen University, Xiamen, China;3. Mariculture Research Center for Subtropical Shellfish & Algae, Shantou University, Shantou, China |
| |
Abstract: | Independent and combined effects of stocking density and algal concentration on the survival, growth and metamorphosis of the Bobu Ivory shell Babylonia formosae habei larvae were assessed using a 5 × 5 factorial design with densities of 0.25, 0.5, 0.75, 1.00 and 1.50 larvae mL?1 and algal concentrations of 5, 10, 15, 20 and 25 × 104 cells mL?1 in the laboratory. Larval growth, survival and metamorphosis were significantly affected by both the independent effects of stocking density and algal concentration and by their interaction. The highest per cent survival (72.5%) and metamorphosis (49.5%), fastest growth (41.57 μm day?1) and shortest time to initial metamorphosis (10 days) all occurred at the lowest stocking density and the highest algal concentration. Both crowding and food limitation had independently negative impacts on the survival, growth and metamorphosis of larvae, and these negative impacts were further strengthened by the interaction of a higher stocking density and a lower algal concentration. Moreover, the results suggest that stocking density and algal concentration obviously played different roles in determining larval survival and growth. To maximize survival and growth, B. formosae habei larvae should be reared at a lower stoking density of 0.25 larvae mL?1 and fed a higher algal concentration of 25 × 104 cells mL?1 in large-scale hatchery seed culture. |
| |
Keywords: | Babylonia formosae habei larvae stocking density Algal concentration Survival Growth Metamorphosis |
|
|