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The mealworm beetle breeds prolifically. Mating is a three-step process: the male chasing the female, mounting her and inserting his aedeagus, and injecting a sperm packet. Within a few days the female burrows into soft ground and lays eggs. Over a lifespan, a female will, on average, lay about 500 eggs.[citation needed]
After four to 19 days the eggs hatch. Many predators target the eggs, including reptiles.[citation needed]
During the larval stage, the mealworm feeds on vegetation and dead insects and molts between each larval stage, or instar (9 to 20 instars). After the final molt it becomes a pupa. The new pupa is whitish, and it turns brown over time. After 3 to 30 days, depending on environmental conditions such as temperature, it emerges as an adult beetle.[citation needed]
Sex pheromones
A sex pheromone released by male mealworms has been identified.[1] Inbreeding reduces the attractiveness of sexual pheromone signaling by male mealworms.[2] Females are more attracted to the odors produced by outbred males than the odors produced by inbred males. The reduction of male signaling capability may be due to increased expression of homozygous deleterious recessive alleles caused by inbreeding.
Relationship with humans
Tenebrio molitor is often used for biological research. Its relatively large size, ease of rearing and handling, and status as a non-model organism make it useful in proof of concept studies in the fields of basic biology, biochemistry, evolution, immunology and physiology.[citation needed]
As pests
Mealworms have generally been considered pests, because they feed on stored grains. Mealworms probably originated in the Mediterranean region, but are now present in many areas of the world as a result of human trade and colonization. The oldest archaeological records of mealworms can be traced to Bronze Age Turkey. Records from the British Isles and northern Europe are from a later date, and mealworms are conspicuously absent from archaeological finds from ancient Egypt.[4]
As feed and pet food
Main articles: Insects as feed and Insect based pet food
Mealworms are typically used as a pet food for captive reptiles, fish, and birds. They are also provided to wild birds in bird feeders, particularly during the nesting season. Mealworms are useful for their high protein content. They are also used as fishing bait.[citation needed]
They are commercially available in bulk and are typically available in containers with bran or oatmeal for food. Commercial growers incorporate a juvenile hormone into the feeding process to keep the mealworm in the larval stage and achieve an abnormal length of 2 cm or greater.
As food
Main articles: Insects as food and Entomophagy in humans
Mealworms in a bowl
Mealworms are edible for humans, and processed into several insect food items available in food retail such as insect burgers.[6]
Mealworms have historically been consumed in many Asian countries, particularly in Southeast Asia. There, they are commonly found in food markets and sold as street food alongside other edible insects. Baked or fried mealworms have been marketed as a healthy snack food in recent history, though the consumption of mealworms goes back centuries.[citation needed]
In May 2017, mealworms were approved as food in Switzerland.[7] In June 2021, dried mealworms were authorized as novel food in the European Union,[8] after the European Food Safety Authority assessed the larvae as safe for human consumption.[9][10]
Mealworm larvae contain significant nutrient content. For every 100 grams of raw mealworm larvae, 206 calories and anywhere from 14 to 25 grams of protein are contained.[11] Mealworm larvae contain levels of potassium, copper, sodium, selenium, iron and zinc that rival that of beef. Mealworms contain essential linoleic acids as well. They also have greater vitamin content by weight compared to beef, B12 not included.[11][12]
Mealworms may be easily reared on fresh oats, wheat bran or grain, with sliced potato, carrots, or apple as a moisture source.
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