Given the increasing human demand for food, ensuring food supply has become a challenge, and maintaining food security is a necessity that, in its absence, can jeopardize national security48. Therefore, any threat to food resources must be taken seriously. On the other hand, combating threats should not lead to secondary problems. While pest control is essential, it's important to recognize that the use of pesticides can have unintended biological effects49. While pesticide spraying may eliminate large locust populations, it can lead to the development of biological resistance in smaller populations, allowing them to rebound and pose new threats50–53. Due to the developed biological resistance, pesticides might not have a sufficient impact.
Observations of the feeding habits of Geladas, wolves, and ravens on locusts in the Gwasa Plateau located in Ethiopia in 2009 revealed the extent to which these insects can integrate into an ecosystem's food chain54.
Many countries are grappling with the impact of the Locusts' invasion. Most of the outbreaks and damages are witnessed in Africa and Asia, while the territories of European countries bordering the Mediterranean Sea are also among the destinations for Locusts. The scarcity of food resources and environmental preservation can be considered reasons behind the pursuit of Locusts.
One behavioral characteristic of Locusts is their attraction to light, which leads to their entrapment55. Research conducted in the Mauritanian desert has shown that they are drawn to light during the night and gather on elevated vegetation56. Researchers from the Chinese Society of Agricultural Engineering have observed that Locusts are attracted to visible light rays, displaying a positive phototactic response57. On the other hand, a positive response of their visual system to 610 nm orange light has been reported58,59. Moreover, reports indicate an increase in phototaxis at a temperature of 65°C60.
Consuming bugs, or entomophagy, is highly suggested by the Food and Agriculture Organization (FAO) of the United Nations as a strategy to combat poverty and starvation61–64. Numerous countries have adopted the habit of eating insects for sustenance, with a plethora of choices on offer such as worms, ants, beetles, grasshoppers, crickets, tree bugs, water beetles, honeybees, wild bees, silkworms, aquatic insect larvae, and a multitude of other insect species being relished as meals or snacks. Due to their high nutritional value65, Locusts are used as appetizers or even complete meals in restaurants in certain countries66. China, India, Pakistan, Japan, Korea, Thailand, Indonesia, Malaysia, Cambodia, Laos, Australia, Mexico, Arab countries, African countries, South American countries, and others have embraced insect farming, including Locusts. Some of them consume these edible insects due to food scarcity among consumers67.
Creating livestock, chicken, and fish farming hubs is a method to guarantee food availability, however, the reproduction rate of mammals, birds, and marine creatures can't rival that of Locusts68. Thus, besides human consumption, Locusts can be utilized to nourish a variety of animals like livestock, poultry, and fish48,68–74. Considering that the majority of feed for farmed birds is composed of corn and soybeans (Table 5), Locusts can be considered the best alternative due to their high protein content75,76. Research on the possibility of raising poultry in areas affected by Locusts' invasion in the grasslands of Huángchēng, China, indicates that birds feed well on them, leading to an increase in both the quantity and quality of their meat77.
Table 5
Resources needed to produce 1 kg of protein78,79
| Amount of feed needed to produce 1 kg of protein (kg) | Amount of water needed to produce 1 kg of protein (Li) |
Cow | 20 | 1500 |
Pig | 6.7 | 600 |
Chicken | 3.3 | 360 |
Locust | 1.7 | 1 |
Research indicates that Locusts have a high nutritional value (Table 6). Protein constitutes 46–56% of the dry weight of Locusts. The fat content is estimated to be 31–35%, which is lower than the protein content. Chitin makes up 6–13%, and the share of saturated and unsaturated fatty acids is reported as 44% and 54%, respectively. Locust has a cholesterol level of approximately 286 mg/100g, surpassing that of beef or chicken by a significant margin80,81. Additionally, Locust meat is rich in iodine, phosphorus, iron, thiamine, riboflavin, niacin, calcium, magnesium, selenium, and vitamin B82,83. The carbohydrate content in Locusts is minimal, making it a favored choice in certain dietary plans in Southeast Asian nations. Edible insects, in terms of energy content, are a more suitable source compared to soybeans, corn, lentils, meat, and legumes. The quality of Locust’s meat improves with a diet rich in nitrogenous plant leaves40,84,85.
Table 6
Nutritional value of locust meat (100gr)78,86,87
| Locust | Beef | Lamb | Salmon |
Water | - | 57.98 (g) | 58.6 (g) | < 65 (g) |
Protein | 3.14 (g) | 25.93 (g) | 18 (g) | 18.7 (g) |
Fat | 3.3 (g) | 15.41 (g) | 18 (g) | 0.8 (g) |
Carbohydrate | 2.2 (g) | - | - | - |
Calcium | 5.27 (ml/g) | 18 (ml/g) | 9 (ml/g) | - |
Iron | 0.3 (ml/g) | 2.6 (ml/g) | 2.3 (ml/g) | < 0.2 (ml/g) |
It should be recognized as a necessity that diversifying food sources contributes to food security88. The challenges associated with food production in farms, poultry houses, and livestock farms are driving the world towards increased utilization of insects in the not-so-distant future68. Harvesting Locusts is feasible and can be done at a low cost49,89,90. Through taking this action, we can not only reduce the spread of Locusts but also create job prospects. Refraining from using chemicals results in cost savings and stops the influx of harmful substances into ecosystems and food webs.
In conclusion, based on the findings of this study and other referenced research above, it can be stated that:
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Large-scale harvesting of Locusts is feasible.
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Harvesting Locusts as a natural and environmentally-friendly control method can aid in maintaining ecosystem balance without causing environmental pollution and unintended side effects associated with pesticide use.
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Locust hunting can contribute to reducing agricultural damage and preserving product quality, potentially reducing the need for chemical pesticides.
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Harvesting Locusts is more cost-effective compared to spraying them with chemicals.
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Earnings obtained from vending Locusts may assist in offsetting monetary setbacks caused by pest-ridden farm goods.
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Raising Grasshoppers is a more cost-effective and more eco-friendly alternative to raising different kinds of animals, birds, and aquatic creatures.
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Feeding various types of livestock, poultry, and fish with Locusts can enhance the quality of meat and derived products.
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Entomophagy as a necessity for food security should be given more attention than ever before.
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Locusts, as rich sources of protein and nutrients, can partially address nutritional deficiencies in communities facing food scarcity.
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The use of Locusts in nutrition can help reduce reliance on traditional food sources.
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Incorporating Locusts in the diet of other animals can contribute to water-saving in food production.
In light of these points, considering the potential benefits of Locust utilization, it is evident that exploring and implementing strategies for their sustainable harvesting and integration into various food systems can have multifaceted positive impacts on food security, environmental preservation, and economic development.