To determine the differences in food quality between fish fed a low fish meal diet containing black soldier fly (Hermetia illucens) instead of fish meal and those fed a general fish meal diet, we analyzed the approximate components, mineral content, amino acid composition, fatty acid composition, color, and texture of Flounder (Paralichthys olivaceus). The analysis of approximate components showed no difference between the two samples, except for moisture content. Mineral contents were measured in the order of K, P, Na, and Mg in both samples, with no difference except for phosphorus (P). A total of 16 amino acids were detected in both samples, with no significant differences in their composition. Additionally, 17 types of free amino acids were identified, with no significant differences between the two samples. The fatty acid composition consisted of 13 fatty acids, with palmitic acid, DHA, and oleic acid being the most prominent, although slight differences in content were observed. The color and texture also showed no differences between the two samples. Overall, there were no significant differences in chemical components or physical characteristics, so it was judged to be insignificant in terms of food science.

Nacre of abalone shell features a “brick-and-mortar” microstructure, in which micro-plates of calcium carbonate are bonded by nanometers-thick layers of chitin and proteins. Due to the microstructure and its unique toughening mechanisms, nacre possesses an excellent combination of specific strength, stiffness and toughness. This study deals with the possibility of using nacre fragments obtained from abalone shell for making a bulletproof armor system. A composite plate laminated with abalone shell fragments is made and compression and bend tests are carried out. In addition, a bulletproof test is performed with hybrid armor systems which are composed of an alumina plate, a composite plate, and aramid woven fabric to verify the ballistic performance of nacre. The compressive strength of the composite plate is around 258.3MPa. The bend strength and modulus of the composite plate decrease according to the plate thickness and are about 149.2MPa and 50.3 GPa, respectively, for a 4.85 mm thick plate. The hybrid armor system with a planar density of 45.2 kg/m2, which is composed of an 8 mm thick alumina plate, a 2.4 mm thick composite plate, and 18 layers of aramid woven fabric, satisfy the NIJ Standard 0101.06 : 2008 Armor Type IV. These results show that a composite plate laminated with abalone shell fragments can be used for a bulletproof armor system as an interlayer between ceramic and fabric to decrease the armor system’s weight.