Investigation of Optimal Low-Temperature Storage Conditions for Protaetia brevitarsis seulensis larvae
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The edible insect Protaetia brevitarsis seulensis is widely cultivated in South Korea, but fluctuating consumer demand presents challenges to inventory management and labor efficiency. This study investigated the effects of low-temperature storage on the survival, growth, and development of P. brevitarsis seulensis larvae. Third-instar larvae were stored at 15°C, 12°C, and 10°C for 140 days, followed by recovery rearing at 18°C, 25°C, and 30°C. Survival rate, pupation period, prepupal weight, and growth rate during this period were analyzed. The results indicated that larvae stored at 15°C exhibited the highest survival rate (100%) across all recovery temperatures, while those stored at 12°C showed a slightly lower survival rate (80–100%). At 10°C, the survival rate decreased to 60–90%, dependent on the recovery temperature. Additionally, larvae stored at lower temperatures exhibited longer pupation periods, while those that recovered at 30°C developed significantly faster than those at 18°C. Prepupal weight increased with lower storage temperatures; larvae stored at 10°C and recovered at 30°C exhibited the highest weight (1.9 ± 0.17 g). Growth rate also varied significantly, with the highest growth rate observed in larvae stored at 10°C and recovered at 30°C (404.1 ± 92.8%). These results suggest that low-temperature storage can be deployed to effectively extend the larval stage and regulate insect production in response to market demand. This study demonstrates that storing P. brevitarsis seulensis larvae at 12–15°C with adequate food supply is an optimal strategy for maintaining survival and managing production cycles to adapt to fluctuating consumer demand. Additionally, rapid growth and development can be induced by increasing the recovery temperature to 30°C, offering a practical approach for insect farming industries to optimize production efficiency.
Abstract
The edible insect Protaetia brevitarsis seulensis is widely cultivated in South Korea, but fluctuating consumer demand presents challenges to inventory management and labor efficiency. This study investigated the effects of low-temperature storage on the survival, growth, and development of P. brevitarsis seulensis larvae. Third-instar larvae were stored at 15°C, 12°C, and 10°C for 140 days, followed by recovery rearing at 18°C, 25°C, and 30°C. Survival rate, pupation period, prepupal weight, and growth rate during this period were analyzed. The results indicated that larvae stored at 15°C exhibited the highest survival rate (100%) across all recovery temperatures, while those stored at 12°C showed a slightly lower survival rate (80–100%). At 10°C, the survival rate decreased to 60–90%, dependent on the recovery temperature. Additionally, larvae stored at lower temperatures exhibited longer pupation periods, while those that recovered at 30°C developed significantly faster than those at 18°C. Prepupal weight increased with lower storage temperatures; larvae stored at 10°C and recovered at 30°C exhibited the highest weight (1.9 ± 0.17 g). Growth rate also varied significantly, with the highest growth rate observed in larvae stored at 10°C and recovered at 30°C (404.1 ± 92.8%). These results suggest that low-temperature storage can be deployed to effectively extend the larval stage and regulate insect production in response to market demand. This study demonstrates that storing P. brevitarsis seulensis larvae at 12–15°C with adequate food supply is an optimal strategy for maintaining survival and managing production cycles to adapt to fluctuating consumer demand. Additionally, rapid growth and development can be induced by increasing the recovery temperature to 30°C, offering a practical approach for insect farming industries to optimize production efficiency.