scholarly journals The influence of wet feed distribution on the density, growth rate and growth variability of Tenebrio molitor

2020 ◽  
pp. 1-10
Author(s):  
D. Deruytter ◽  
C.L. Coudron ◽  
J. Claeys
Keyword(s):  
Growth Rate ◽  
Growth Stage ◽  
Larval Growth ◽  
Tenebrio Molitor ◽  
Unequal Distribution ◽  
Growth Variability ◽  
Density Growth ◽  
Food And Feed ◽  
Mealworm Larvae

Mealworm larvae have the potential to be a future food and feed. One of the difficulties in rearing mealworms efficiently, is their need for both dry and wet feed. Extensive research has been done on dry feed and distributing this feed is easy with the existing technology. However, the wet feed (frequently chopped up vegetables) comes with several challenges. The nature of the wet feed (neither solid nor liquid) complicates automation, making manual feeding still the norm in many farms. This may result in an unequal distribution of the wet feed. The goal of this study was to assess the influence of distance to the wet feed (substituted by agar) on density, growth rate and growth rate variability of mealworm larvae. The entire larval growth stage was assessed from less than 1 mg up to more than 100 mg, as differences in mobility were expected for different sized larvae. The results indicate that the distribution of the agar plays a major role in the distribution and growth of the larvae, with less larvae and a decrease in growth rate observed when the agar was more than 5 to 10 cm away from the larvae. Few mealworms were found more than 15 cm from the agar, and their growth was inhibited resulting in a biomass up to 150 times lower than near the agar. The effects were mainly observed in larvae weighing less than 30 mg, heavier mealworms were mobile enough to crawl to and from the agar. Based on the results, and in order to ensure that all larvae sizes grow equally well and are well distributed in the crate, we strongly advise against distances of 10 cm or more and we recommend the placement of wet feed within 5 cm from the larvae.

The effect of relative humidity on the survival and growth rate of the yellow mealworm larvae (Tenebrio molitor, Linnaeus 1758)

2021 ◽  
pp. 1-8
Author(s):  
N.S. Johnsen ◽  
J.L. Andersen ◽  
J. Offenberg
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Relative Humidity ◽  
Tenebrio Molitor ◽  
Larval Survival ◽  
Yellow Mealworm ◽  
Farming Community ◽  
Livestock Sector ◽  
Survival And Growth ◽  
Mealworm Larvae

The current livestock sector is a large contributor to the environmental challenges facing the world. To reduce the environmental impact of food production, a change of the sector is necessary. Entomophagy could be a step towards a more sustainable protein production. However, the insect farming community has a short history compared to conventional livestock, thus, it lacks knowledge of how a profitable mass production of insects is established. In this study we aimed to find the optimal relative humidity (RH) for production of larvae of a popular species for insect farming; the yellow mealworm, Tenebrio molitor. More specifically we tested the effect of a RH of 43, 51, 68, 75 and 84% on the survival rate, mass and length of T. molitor larvae, from hatching and two weeks forward. Control of RH was achieved using the saturated salt solution method, and the temperature was kept at 30 °C. Experiments were carried out over 12 weeks. The sample size was 100 larvae and eight replicates per treatment. Results showed that the RH had no effect on larval survival rate but had a significant effect on individual larvae mass and length after three weeks. Larval mass and length increased with humidity, and larvae reared at a RH of 84% were 1.96 times heavier and 1.31 times longer than larvae raised at 43%. Hence, for an industrial mass producer of T. molitor larvae, applying close to the optimal RH of 84% would likely result in an increased larvae size at harvest and a faster growth rate, ultimately leading to a higher yield.

99 Relationship between crude protein content and larval growth in Tenebrio molitor

2021 ◽  
Vol 12 (1) ◽  
pp. 78
Author(s):  
Kerensa Hawkey ◽  
Jon Stubberfield ◽  
Tim Parr ◽  
John Brameld ◽  
Andrew Salter
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Larval Growth ◽  
Tenebrio Molitor ◽  
Crude Protein Content

scholarly journals (A343) Rebuilding Post Conflict Food Security in Liberia

2011 ◽  
Vol 26 (S1) ◽  
pp. s96-s97
Author(s):  
T.W. Graham
Keyword(s):  
Growth Rate ◽  
Food Security ◽  
Food Supply ◽  
Food Production ◽  
Potable Water ◽  
Food Storage ◽  
Unequal Distribution ◽  
Post Conflict ◽  
Safe Food ◽  
Domestic Food

Liberia's 14 year civil war destroyed domestic agricultural production, veterinary and agricultural education, extension services and domestic food security. These losses severely limited domestic food production, and basic hygiene and sanitation: potable water, abattoirs, cold chain and food storage were greatly diminished. The average Liberian life expectancy fell from 45.8 in 1990 to 41.8 years presently. The population birth and death rate are two of the highest globally with a resulting population growth rate, of 2.7% per annum; this growth rate requires an immediate and concerted focus on domestic food production to alleviate nutritional inadequacy and hunger, trade imbalances and loss of foreign exchange credits. Food supply nationally is presumed adequate because of importation, though domestic production is inadequate. Unequal distribution precludes food security for all Liberians. Value chain augmentation, enhancing food availability across all sectors of Liberian society and ensuring distribution of a safe food supply needs critical development. Infant mortality remains one of the highest in the world (approximately 160/1000 births), much of which is attributed to food insecurity, food contamination and lack of uniformly available potable water. Recreation of Liberia's public health and food security requires redevelopment of disease monitoring and laboratory diagnostic capability to re-establish safe food production and handling practices across all sectors. This will allow determination of endemic disease burden for the principal livestock species: poultry, sheep, goats, cattle and swine. Creation of a national disease surveillance/monitoring system allows for targeted disease intervention, ensuring vaccination for correct serotypes and most critically prevalent diseases. Creation of community level training and support will target intervention of local diseases, but also allow for national prioritization of diseases. Targeting which are most prevalent or most likely to cause production limiting effects will require periodic surveillance, targeted vaccination, and chemotherapeutic intervention and evaluation of therapeutic success.

Comparison of volumetric and surface decontamination techniques for innovative processing of mealworm larvae (Tenebrio molitor)

2014 ◽  
Vol 26 ◽  
pp. 232-241 ◽  
Author(s):  
Birgit A. Rumpold ◽  
Antje Fröhling ◽  
Kai Reineke ◽  
Dietrich Knorr ◽  
Stefan Boguslawski ◽  
...  
Keyword(s):  
Tenebrio Molitor ◽  
Surface Decontamination ◽  
Mealworm Larvae

Feeding of cuticles from Tenebrio molitor larvae modulates the gut microbiota and attenuates hepatic steatosis in obese Zucker rats

2022 ◽  
Author(s):  
Armaghan Saeb ◽  
Sarah Maria Grundmann ◽  
Denise K Gessner ◽  
Sven Schuchardt ◽  
Erika Most ◽  
...  
Keyword(s):  
Gut Microbiota ◽  
Hepatic Steatosis ◽  
Mass Rearing ◽  
Tenebrio Molitor ◽  
Zucker Rats ◽  
Insect Larvae ◽  
Food And Feed ◽  
Obese Zucker Rats ◽  
Tenebrio Molitor Larvae

an alternative and sustainable source of food and feed. A byproduct from mass-rearing of insect larvae are the shed cuticles - the most external components of insects which are a...

scholarly journals Factors Influencing the Chlorine Susceptibility of Mycobacterium avium, Mycobacterium intracellulare, and Mycobacterium scrofulaceum

2003 ◽  
Vol 69 (9) ◽  
pp. 5685-5689 ◽  
Author(s):  
Joseph O. Falkinham
Keyword(s):  
Growth Rate ◽  
Mycobacterium Avium ◽  
Growth Phase ◽  
Growth Rates ◽  
Growth Stage ◽  
Tween 80 ◽  
Culture Conditions ◽  
C Cells ◽  
Mycobacterium Intracellulare ◽  
Factors Influencing

ABSTRACT The susceptibility of representative strains of Mycobacterium avium, Mycobacterium intracellulare, and Mycobacterium scrofulaceum (the MAIS group) to chlorine was studied to identify factors related to culture conditions and growth phase that influenced susceptibility. M. avium and M. intracellulare strains were more resistant to chlorine than were strains of M. scrofulaceum. Transparent and unpigmented colony variants were more resistant to chlorine than were their isogenic opaque and pigmented variants (respectively). Depending on growth stage and growth rate, MAIS strains differed in their chlorine susceptibilities. Cells from strains of all three species growing in early log phase at the highest growth rates were more susceptible than cells in log and stationary phase. Rapidly growing cells were more susceptible to chlorine than slowly growing cells. The chlorine susceptibility of M. avium cells grown at 30°C was increased when cells were exposed to chlorine at 40°C compared to susceptibility after exposure at 30°C. Cells of M. avium grown in 6% oxygen were significantly more chlorine susceptible than cells grown in air. Chlorine-resistant MAIS strains were more hydrophobic and resistant to Tween 80, para-nitrobenzoate, hydroxylamine, and nitrite than were the chlorine-sensitive strains.

scholarly journals Contribution of larval growth rate vairability to the recruitment of the Bay of Málaga anchovy (SW Mediterranean) during 2000-2001 spawning seasons

2003 ◽  
Vol 67 (4) ◽  
pp. 477-490 ◽  
Author(s):  
Alberto García ◽  
Dolores Cortés ◽  
Teodoro Ramírez ◽  
Ana Giráldez ◽  
Ángel Carpena
Keyword(s):  
Growth Rate ◽  
Larval Growth ◽  
Larval Growth Rate
Sign in / Sign up

Export Citation Format

Share Document