| In order to explore the best ratio between polystyrene and wheat bran in the degradation of polystyrene of the Tenebrio molitor , 11 groups of feed (polystyrene: wheat bran)PS1 (1∶9), PS2 (2∶8), PS3 (3∶7), PS4 (4∶6), PS5 (5∶5), PS6 (6∶4), PS7 (7∶3), PS8 (8∶2), PS9 (9∶1), PS10 (10∶0)and CK (0∶10)were used to evaluate the weight gain, mortality, feed intake, polystyrene intake, feed digestibility, feed utilization rate, faecal output, pupation rate, emergence rate and oviposition number of the T.molitor. The results showed that the growth performance of the T. molitor decreased with the ratio of polystyrene in the feed. However, the weight gain in the groups of CK, PS1, PS2, PS3 and PS4 were similar, when a majority of the larvae pupated.The pupation age of PS3 and PS4 group were about 7 days later than that in the groups of CK, PS1 and PS2, which was helpful for the larvae to degrade more polystyrene. The amount of polystyrene intake of PS4 group was slightly higher than that in the PS3 group, while there was no significant difference in feed digestibility, feed utilization, mortality and oviposition number between the PS3 and PS4 group. However, the pupation rate, emergence rate and dry matter in the PS3 group were better than those in the PS4 group.In these regards, the ratio of 3∶7 (polystyrene: wheat bran)was optimal, which could not only ensure the normal growth and development of the T. molitor to keep the economic value, but could also degrade more polystyrene. The results of this study provided fundamental information for large-scale cultivation of the T. molitor in polystyrene degradation. |
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