Some optimal culture conditions for Marilia sumatrana (Insecta: Trichoptera) larvae in the laboratory
Keywords:
Caddisfly larvae, Rearing, Laboratory, FeedAbstract
Caddisfly larvae have been used in many fields, such as environmental impact assessment, food preparation, and ornamentals from their cases. However, reported information on the culturing of caddisfly larvae in the laboratory is poorly understood. Therefore, it would be beneficial to study some optimal culture conditions of the Marilia sumatrana larvae in the laboratory. Samples of the larvae (smaller than 5mm) were collected from Yuan Stream, Chiang Kham District, Phayao province. This study was divided into 2 experimental groups (each experimental rearing for 4 weeks). 1) The effects of the flowing and still water rearing systems on the growth and survival rate of M. sumatrana were examined in the laboratory. The results indicated that the survival rates of the flow water treatment were significantly (p < 0.05) higher than that of the still water treatment (91.11 ± 2.12 and 80.00 ± 2.85 %, respectively), whereas the final lengths of larvae cases reared in the flow water and still water were not significantly different (p > 0.05) (13.37 ± 0.73 and 14.07 ± 0.66 mm, respectively). 2) The effect of foods (leaf litter, catfish fry feed and shrimp feed) on the growth and survival rate of M. sumatrana was investigated in the laboratory. The results showed that the final lengths of the larvae cases from treatments fed by catfish fry feed and shrimp feed (12.96 ± 0.42 and 12.74 ± 0.56 mm, respectively) were significantly (p < 0 .05) higher than those fed by leaf litter (8.82 ± 0.25 mm), but the survival rates of any treatment were not significantly different (p > 0.05). In conclusion, the culture conditions of the M. sumatrana larvae in the laboratory should be reared in flowing water and fed with catfish fry feed. Finally, the results of this study might be applied to other types of caddisfly larval culture design.
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