molitor decreases in response to befitting conditions ( 1). Tenebrio molitor displays variability in developmental time ( 1, 2), as the number of instars can vary from 9 to 20 ( 3, 4) depending on several abiotic factors, such as temperature, humidity, oxygen concentration, and biotic factors, such as population density, parental age, and feed quality ( 5– 10). Within these different stages, the mealworm morphologies vary greatly. This mealworm goes through several stages: egg, larva, pupa, and adult. Tenebrio molitor (Coleoptera: Tenebrionidae) is a common storage pest that is distributed throughout the world. This finding provides an alternative option to farm insects for different purposes and in an economic way. Furthermore, the larvae in the earlier instar consumed dramatically less feed and could effectively reduce the farming costs of insect farmers. Therefore, we found that the earlier instar is better than the final instar as the insect farming harvest time. The results of amino acid composition dynamic analysis also indicated comparatively higher essential amino acids in the earlier instar (e.g., before the 9th instar) larvae. The results of the component dynamic analyses in the different development stages showed that the percentages of protein, fat, and chitin were the highest in the larval stage, pupal stage, and adult stage, respectively. In this study, the content dynamics for protein, fat, chitin, and other components in the whole development process of yellow mealworms were analyzed by sampling from different instars and combining with their growth conditions. The yellow mealworm, Tenebrio molitor, is an important resource insect with a high protein percentage that is widely farmed in many countries. Institute of Entomology, Northwest A&F University, Yangling, China.
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