| Spotted babaylon(Babylonia areolata) is an emerging aquaculture shellfish in China. The appropriate substrate materials for indoor intensive recirculating aquaculture systems was screened for spotted babaylon. The effect of light colors on growth, and survival energy metabolism are also studied. The results of this research can would help to improve the industrial breeding technology of spotted babaylon, and provide efficient, safe product.The feeding, burrowing, climbing and floating behavior of spotted babaylon was studied, and found that spotted babaylon perceived food mainly by antenna, osphradium, front feet, and fed by proboscis. Burrowing process including preparation stage, burrowing stage, and termination stage. Climbing maladaptation unsuitable environment in artificial breeding.The influence of five different bottoms on growth, survival, and cultivate water quality of spotted babylon was studied, and found that white ceramic is not suitable for its survival, and non-substrate does not affect its survival,while the survival between other groups has no significant difference(P > 0.05).Specific growth rate of shell width and height under brown ceramic are significantly higher than the other groups, when specific growth rates of weight are significantly higher than white-ceramic and nonsubstrate(P<0.05),and 14% higher than natural sand group. Feeding rate under nonsubstrate is significantly higher than groups of shell sand and brown ceramists(P<0.05); The feed conversion efficiency of brown ceramists group is higher than no bottom and white ceramic(P<0.05). The difference in the TAN concentration is not significant(P < 0.05) at early stage. Later, TAN concentrations of natural sand and white ceramic is significantly higher than other groups. The nitrite nitrogen concentration combined brown ceramist and shell group is significantly higher than that of other groups(P>0.05).Between the other groups have no significant difference in the prophase(P>0.05). The change of COD concentration gradually trend rising with the passage of the experiment, and between each group have no differences(P>0.05), which are maintain in low level. Considering from growth and survival, it is suggested that using brown ceramist in production instead of natural sand as a substrate.The impact of five kinds of LED light including blue, white, green, orange, and red and dark conditions on(initial weight: 0.25±0.06 g) growth, survival, and energy metabolism of B. areolata are studied. The results show that different light colors have no significant difference on survival(P>0.05).Different light color have significant difference on specific growth rate of body weight and shell height, shell width(P>0.05).The level is blue > green > white > red > dark= orange. The influence of the light color on feeding rate have not significant difference(P> 0.05). The feed conversion efficiency in blue and green group is highest, while the lowest group is orange. Different color have significantly influence on protease, lipase and amylase activity(P< 0.05). White light group has the highest protease activity and lipase vigor, protease and lipase vigor lowest green groups. The amylase activity of the highest dark group, green group are the lowest. LDH activity of White light, red light and green light is significantly higher than blue light, orange light and dark. PK vitality under dark group is the highest, then followed is the white light > red light blue > orange light =green light. HK vitality is strongest in green group, then followed by white, blue, red, orange. HK vitality is weakest in dark group.it is suggested that blue and green light was used as a light source in indoor farming.According to biological characteristics and behavioral research, survey results of existing cultivation mode, lessons from other organisms(fish, shrimp etc), the circulating water aquaculture system was designed, in order to build a set of spotted babylon in high-density circulating water aquaculture system. |
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