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Edible insects have great potential to be human food; among them, aquatic insects have unique characteristics. In contrast with the role of plant feeders that most terrestrial edible insect species play, most aquatic edible insects are carnivorous animals. Besides the differences in physiology and metabolism, there are differences in fat, fatty acid, limiting/flavor amino acid, and mineral element contents between terrestrial and aquatic insects.
Entomophagy has decreased significantly with the development of modern agriculture; however, it still exists and plays important roles in the lives of people in underdeveloped areas. In recent years, considering their outstanding source of nutrition [1], low levels of greenhouse gas emissions [2], limited agricultural land being required [3], and potential socio-economic benefits, edible insects have been considered as valuable and sustainable alternative nutrition sources for food security [4]. The topics of “edible insects as food candidates” or “insects as an alternative protein source” have received a huge amount of attention [5][6].
Aquatic insects have an average protein content of 59.55% (Table 1), and this value is higher than that of conventional animal meats [15][16][17]. Furthermore, investigations identified that proteins from aquatic insects not only contain 45.93–62.01% essential amino acids (Table 1), but also have a good balance of different kinds of amino acids [18][19]. Meanwhile, the ratio of essential amino acids in aquatic insect proteins is close to human proteins, indicating a high nutritional value of aquatic insects [20].
Although some studies have shown that the contents of some amino acids are different between aquatic and terrestrial insects, such as tryptophan [21], the difference is not significant judging from the average data, and this indicates that aquatic insects and terrestrial insects have similar amino acid compositions (Table 1). For example, Lys is present in both terrestrial edible insects and aquatic edible insects, with a rich content [22]. However, this essential amino acid is usually lacking in cereal protein, so both aquatic insects and terrestrial insects complement cereal protein in nutrition.
Order | Species | Edvelopmental Stage | Protein (%) |
Amino Acid Composition (% of Total Amino Acids or Protein) | Total Amino Acids (g/100 g DM) |
Reference | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Val | Ile | Leu | Lys | Tyr | Thr | Phe | Trp | His | Met + Cys | Total EAA ++ | Arg | Asp | Ser | Glu | Gly | Ala | Pro | ||||||
Edible aquatic insects | |||||||||||||||||||||||
Odonata | Epophthalmia elegans | L | 65.23 | 9.96 | 2.78 | 6.43 | 5.62 | 7.06 | 3.84 | 9.26 | 0.58 | 3.74 | 1.63 | 50.90 | 11.79 | 6.91 | 3.94 | 10.92 | 4.42 | 5.97 | 5.15 | 60.16 | [23] |
Anax parthenope | L | 65.76 | 10.04 | 3.20 | 6.96 | 5.72 | 6.96 | 3.87 | 8.82 | 0.63 | 3.20 | 1.13 | 50.55 | 11.91 | 7.04 | 4.09 | 10.84 | 4.32 | 5.93 | 5.33 | 53.99 | ||
Ictinogomphus rapax | L | 62.37 | 10.08 | 3.54 | 7.05 | 4.62 | 7.77 | 4.24 | 12.12 | 0.50 | 3.09 | 1.44 | 54.45 | 9.92 | 6.99 | 3.97 | 8.30 | 4.84 | 6.85 | 4.67 | 55.63 | ||
Sinictinogomphus clavatus | L | 63.64 | 9.55 | 3.51 | 7.19 | 5.42 | 7.64 | 4.32 | 10.51 | 0.53 | 2.89 | 1.66 | 53.23 | 9.95 | 7.74 | 4.00 | 9.32 | 4.91 | 5.98 | 4.87 | 52.98 | ||
Pantala flavescens | L | 65.18 | 9.78 | 3.30 | 7.20 | 5.97 | 6.48 | 4.06 | 8.61 | 0.65 | 2.87 | 1.32 | 50.26 | 12.47 | 7.38 | 4.07 | 10.73 | 4.64 | 6.00 | 4.45 | 58.16 | ||
Orthetrum pruinosum | L | 71.53 | 9.63 | 3.33 | 7.11 | 5.85 | 6.43 | 3.86 | 8.68 | 0.46 | 2.78 | 1.90 | 50.01 | 12.00 | 7.38 | 4.02 | 11.11 | 4.39 | 5.81 | 5.28 | 54.73 | ||
Crocothemis servilia | L | 65.45 | 6.12 | 3.91 | 7.45 | 7.93 | 6.23 | 5.25 | 2.88 | 2.20 | 5.45 | 3.77 | 51.18 | 8.04 | 8.47 | 4.26 | 10.99 | 5.03 | 7.31 | 4.72 | 51.70 | [24] | |
Gomphus cuneatus | L | 64.64 | 6.59 | 7.33 | 3.96 | 6.33 | 7.17 | 4.79 | 3.37 | 0.67 | 6.93 | 4.07 | 51.21 | 4.86 | 6.34 | 4.32 | 14.40 | 5.46 | 7.85 | 5.61 | 50.26 | ||
Lestes praemorsus | L | 46.37 | 6.01 | 6.96 | 4.16 | 8.37 | 7.26 | 4.98 | 3.22 | 5.23 | 6.54 | 2.72 | 55.44 | 8.54 | 6.41 | 4.20 | 13.36 | 4.45 | 7.26 | 5.23 | 36.1 | ||
Ephemeroptera | Ephermeterella jianghongensis | L | 66.26 | 5.75 | 5.29 | 8.51 | 5.51 | 6.00 | 4.88 | 3.27 | - | 3.33 | 3.39 | 45.93 | 5.75 | 8.71 | 4.55 | 15.21 | 4.96 | 9.15 | 5.74 | 65.54 | [25] |
Coleptera | Cybister japonicus | L | 57.34 | 6.33 | 14.18 | 11.96 | 5.14 | 1.06 | 3.95 | 4.53 | - | 4.32 | 2.76 | 54.23 | 6.45 | 8.44 | 4.47 | 8.62 | 8.14 | 7.12 | 2.53 | 47.89 | [26] |
Dytiscus dauricus | L | 57.97 | 6.50 | 12.06 | 11.82 | 5.91 | 1.89 | 4.43 | 3.61 | - | 3.75 | 3.12 | 53.10 | 5.72 | 8.88 | 4.92 | 9.11 | 7.76 | 8.43 | 2.07 | 48.74 | ||
Hydrophilus acminatus | L | 56.41 | 6.12 | 11.24 | 12.16 | 7.08 | 1.19 | 4.14 | 3.28 | - | 3.30 | 2.74 | 51.25 | 4.87 | 10.01 | 4.76 | 8.98 | 8.04 | 7.25 | 2.74 | 47.86 | ||
H. acminatus | L | 20.37 | 5.76 | 4.38 | 7.59 | 6.89 | 5.11 | 4.26 | 4.33 | - | 6.42 | 2.74 | 47.48 | 5.76 | 9.56 | 3.56 | 9.25 | 8.08 | 10.38 | 5.93 | 42.69 | [27] | |
Megaloptera | Acanthacorydalis orientalis | L | 56.56 | 5.63 | 5.61 | 6.96 | 6.25 | 5.76 | 4.88 | 4.39 | - | 4.18 | 2.89 | 46.54 | 6.75 | 10.13 | 4.11 | 17.13 | 5.14 | 5.74 | 4.46 | 53.31 | [25] |
Acanthacory dalisasiatice | A | - | 7.58 | 5.58 | 9.00 | 7.08 | 9.81 | 4.13 | 10.61 | - | 4.02 | 4.21 | 62.01 | 3.90 | 11.73 | 7.69 | - | - | 14.34 | - | 52.01 | [28] | |
Neochauliodes sparsus | L | 67.69 | 6.35 | 4.75 | 7.41 | 7.43 | 6.10 | 4.55 | 4.21 | 0.70 | 4.27 | 3.82 | 49.59 | 7.23 | 9.09 | 4.25 | 12.73 | 4.80 | 7.41 | 4.91 | 56.02 | [29] | |
Edible terrestrial insects | |||||||||||||||||||||||
Hymenoptera | Polybia occidentalis nigratella | B | 61.00 | 5.90 | 4.50 | 7.80 | 7.40 | 5.60 | 4.00 | 3.30 | 0.70 | 3.00 | 5.00 | 47.20 | 5.70 | 8.40 | 4.50 | 12.90 | 7.10 | 6.50 | 6.30 | - | [30] |
Polybia parvulina | B | 61.00 | 6.10 | 4.70 | 7.80 | 7.30 | 5.90 | 4.10 | 3.40 | 0.70 | 3.40 | 5.30 | 48.70 | 5.70 | 7.80 | 4.40 | 13.30 | 7.20 | 6.40 | 6.50 | - | ||
Vespa velutina | B | - | 6.10 | 5.50 | 8.70 | 6.10 | 6.60 | 4.20 | 4.20 | - | 4.20 | 2.40 | 47.00 | 4.50 | 6.30 | 6.30 | 20.10 | 6.30 | 5.50 | 6.10 | 37.90 | [31] | |
V. mandarinia | B | - | 6.30 | 5.70 | 8.70 | 6.30 | 7.30 | 4.30 | 4.30 | - | 4.30 | 2.70 | 48.90 | 2.20 | 6.50 | 6.50 | 21.20 | 6.30 | 5.40 | 5.70 | 36.80 | ||
V. basalis | B | - | 5.70 | 5.30 | 8.50 | 6.80 | 7.10 | 4.30 | 4.30 | - | 4.30 | 1.40 | 46.60 | 4.30 | 6.40 | 6.40 | 22.10 | 5.70 | 5.00 | 5.70 | 28.10 | ||
Coleoptera | Allomyrina dichotoma | L | 54.18 | 5.58 | 4.35 | 6.40 | 4.97 | 7.73 | 3.84 | 3.59 | - | 4.82 | 8.92 | 50.21 | 5.29 | 5.46 | 5.95 | 17.83 | 5.70 | 4.51 | 5.05 | 48.74 | [17] |
Protaetia brevitarsis | L | 44.23 | 6.36 | 4.14 | 5.90 | 4.47 | 8.43 | 3.96 | 4.14 | - | 4.65 | 7.51 | 49.54 | 5.34 | 5.77 | 6.51 | 14.15 | 5.72 | 6.23 | 6.72 | 39.16 | ||
Tenebrio molitor | L | 53.22 | 6.61 | 4.45 | 7.57 | 4.52 | 7.75 | 4.11 | 3.96 | - | 6.29 | 7.10 | 52.36 | 5.01 | 6.20 | 4.94 | 12.99 | 5.87 | 8.90 | 3.73 | 44.50 | ||
Orthoptera | Teleogryllus emma | A | 55.65 | 5.85 | 4.30 | 7.93 | 5.23 | 5.23 | 3.84 | 3.58 | - | 4.82 | 7.63 | 48.41 | 7.43 | 7.71 | 5.91 | 13.03 | 5.09 | 9.19 | 3.24 | 49.95 | |
Gryllus bimaculatus | A | 58.32 | 5.94 | 4.01 | 7.38 | 4.50 | 5.07 | 3.72 | 3.40 | - | 4.64 | 9.98 | 48.63 | 6.69 | 6.69 | 5.07 | 11.87 | 6.17 | 10.48 | 3.70 | 53.83 | ||
Lepidoptera | Antheraea pernyi | P | 71.9 | 6.63 | 7.95 | 3.24 | 4.54 | 2.06 | 4.64 | 8.10 | 4.05 | 2.94 | 1.62 | 45.77 | 4.12 | 6.41 | 4.64 | 12.74 | 4.42 | 6.26 | 12.22 | - | [32] |
Bombyx mori | P | - | 5.60 | 5.70 | 8.30 | 7.50 | 5.40 | 5.40 | 5.10 | 9.00 | 2.50 | 6.00 | 60.50 | 6.80 | 10.90 | 4.70 | 14.90 | 4.60 | 5.50 | 4.00 | - |
Heavy metals. Heavy metal pollution in the freshwater ecosystem poses a great threat to the growth of aquatic insects [58][59]; therefore, there is a growing concern that it will eventually affect the health of humans [60][61]. Up to date, over 33 metallic elements of aquatic edible insects have been detected, and heavy metals, such as Hg, Pb, Cd, and Cr, have attracted serious concern [62]. Most of the metals in nature will enter the water, and the aquatic ecosystem plays an important role in the transfer and circulation of metals. Insects could absorb metal elements and accumulate a higher concentration of them than the environment [63]. The degree of metal element absorption by aquatic insects is related to environmental factors; for example, aquatic insects collected near wastewater treatment plants, or near mines, may show higher metallic element concentrations when compared with other sites [64][65].
Pathogen. Aquatic insects are important vectors (e.g., malaria) of environmental pathogens. Mainly originating from the Japanese encephalitis (JE) virus, the viral encephalitis in Southeast Asia was detected in Culex gelidus in 1976 [66]. Aquatic insects are possible vectors of Mycobacterium ulcerans, which causes chronic skin ulcers in tropical countries [67]. Two conditioned pathogens, Lelliottia amnigena and Citrobacter freundii, were detected from edible aquatic insects of the genus Cybister [68].