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.

scholarly journals Mangrove Rehabilitation at Alo Beach (Karakelang Islands, Talaud) Using Propagul of Rhizophora mucronata Lamk

Jurnal Wasian ◽  
2017 ◽  
Vol 4 (2) ◽  
pp. 69
Author(s):  
Ady Suryawan
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Rhizophora Mucronata ◽  
Randomized Design ◽  
Waves And Tides ◽  
Survival And Growth ◽  
Mangrove Rehabilitation ◽  
Main Factor

This study aimed to know the dynamic of survival rate and growth of Rhizophora mucronata Lamk which planted by using propagules at Alo Beach, Karakelang Island, Talaud. The study was conducted from June 2013 to April 2017, used a complete randomized design with 6 treatments i.e. K1, K2, K3, K4, K5, K6. The amount of propagules in every treatment were 100 pieces each. The parameter observed were characteristic of substrat, survival rate,height and diameter of the plant’s in age of 1.5 months and 48 months. The results showed that treatment had a significant effect on survival rate and growth of Rhizophora mucronata plants. The rehabilitation was categorized as success at 1.5 months old, but it was failed inthe 48 months. Beside waves and tides, low substrat nutrition became the main factor that affect the success of mangrove rehabilitation in Alo Beach.The K5 treatment has the highest survival and growth rate of the plant. The K5 treatment using pnematophore as brace, while planting without brace/K1 has lowest survival and growth rate since months old.Keywords: mangroves, rehabilitation, Rhizophora mucronata, Talaud

scholarly journals Modeling the Emergence and Growth of Alligatorweed at Different Field Capacity Levels

2020 ◽  
Vol 38 ◽  
Author(s):  
T. AHMAD ◽  
A. TANVEER ◽  
M.A. NADEEM ◽  
M. YASEEN
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Growth Parameters ◽  
Field Capacity ◽  
Moisture Regime ◽  
Emergence Time ◽  
Submerged Soils ◽  
Sprouting Capacity ◽  
Dry Conditions ◽  
Survival And Growth

ABSTRACT: A study focusing on different field capacity levels was planned in the Weed Science Lab, Department of Agronomy, University of Agriculture Faisalabad. Fresh alligatorweed was harvested from the Agronomy fields and cuttings (2 cm length) were made from it. These cuttings were placed at 25%, 50%, 75% and 100% field capacity levels in pots for 25 days. The results of the experiments revealed that at all field capacity levels, fragments of alligatorweed were able to sprout and grow. Increased moisture levels significantly increased the emergence ability and survival of the alligatorweed plants upto a certain level. Compared with the control (25% FC), emergence time of the sprouts in the maximum moisture regime (100% of FC) decreased by 40% (12.94 days vs.7.17 days). By contrast, the survival rate of the fragments decreased by 60% (5 vs. 1.75) although survival and growth rate increased at first with 50% FC and 75% FC. Maximum sprouting and growth were found at 50% field capacity. Field capacity does affect the sprouting capacity of alligatorweed fragments but it has only a little influence on growth parameters. The results suggest that alligatorweed can sustain dry conditions to a great extent and also has the ability to sprout and grow in fully submerged soils.

scholarly journals Meat Quality Parameters of Boschveld Indigenous Chickens as Influenced by Dietary Yellow Mealworm Meal

Foods ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3094
Author(s):  
Letlhogonolo Selaledi ◽  
Josephine Baloyi ◽  
Christian Mbajiorgu ◽  
Amenda Nthabiseng Sebola ◽  
Henriette de Kock ◽  
...  
Keyword(s):  
Treatment Group ◽  
Meat Quality ◽  
Tenebrio Molitor ◽  
Quality Parameters ◽  
Control Group ◽  
Breast Meat ◽  
Yellow Mealworm ◽  
Indigenous Chickens ◽  
Breast Weight ◽  
Mealworm Larvae

An experiment was conducted to examine the effects of yellow mealworm larvae (Tenebrio molitor) meal inclusion in diets of indigenous chickens. A total of 160 mixed-sex indigenous Boschveld chickens were randomly divided into four categories: control soybean meal (SBM) and yellow mealworm with percentage levels of 5, 10 and 15 (TM5, TM10 and TM15, respectively). Five replicate pens per treatment were used, with eight birds per pen/replicate. On day 60, two birds from each replicate were slaughtered and eviscerated. Meat quality parameters were measured out on raw carcass and cooked breast meat. The carcass weight, breast weight and gizzard weight of the control group was higher (p < 0.05) than the treatment group (TM15). The cooking loss was lower (p < 0.05) in the SBM control group but higher in the TM15 group. Colour characteristics of breast meat before cooking was lighter in the TM10 and TM15 group, ranged from 61.7 to 69.3 for L* and was significant (p < 0.05). The TM10 and TM15 groups showed a lighter colour than the SBM and TM5 groups. The breast meat pH taken after slaughter was different (p < 0.05) in TM5 and TM15, with the highest reading (pH 6.0) in the TM5 group. In conclusion, our experiment indicated that dietary Tenebrio molitor in growing Boschveld indigenous chickens’ diets could be considered a promising protein source for Boschveld indigenous chickens.

scholarly journals Replacement of Fish Meal by Defatted Yellow Mealworm (Tenebrio molitor) Larvae in Diet Improves Growth Performance and Disease Resistance in Red Seabream (Pargus major)

Animals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 100 ◽  
Author(s):  
Atsushi Ido ◽  
Atsushi Hashizume ◽  
Takashi Ohta ◽  
Takayuki Takahashi ◽  
Chiemi Miura ◽  
...  
Keyword(s):  
Fish Meal ◽  
Tenebrio Molitor ◽  
Animal Protein ◽  
Edwardsiella Tarda ◽  
Partial Replacement ◽  
Yellow Mealworm ◽  
Complete Replacement ◽  
Red Seabream ◽  
Mealworm Larvae ◽  
Tenebrio Molitor Larvae

Yellow mealworm (Tenebrio molitor) larvae are a potential alternative animal protein source for sustainable aquaculture. However, reports on the successful complete substitution of fish meal with yellow mealworm larvae in an aquaculture diet have been limited. In this study, we conducted a feeding trial with red seabream (Pagrus major) being fed diets with partial or complete replacement of fish meal with yellow mealworm larvae defatted with a hexane–ethanol solution. Feed intake in red seabream increased in accordance with yellow mealworm larvae inclusion, and diets including 65% defatted mealworm larvae (complete replacement of fish meal) showed significant growth promotion. The addition of the oil fraction from mealworm larvae to diets resulted in growth reduction, despite meeting the nutritional requirements of red seabream. Moreover, the survival rate of red seabreams fed diets with partial replacement of fish meal with mealworm larvae was significantly higher in a challenge test with pathogenic Edwardsiella tarda bacteria. The present study demonstrated that yellow mealworm larvae are not merely an alternative animal protein, but have potential as functional feed ingredients for aquaculture production.

scholarly journals Effect of temperature on the survival and growth of freshwater prawns Macrobrachium borellii and Palaemonetes argentinus (Crustacea, Palaemonidae)

2011 ◽  
Vol 101 (3) ◽  
pp. 233-238 ◽  
Author(s):  
Marcela C. Montagna
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Anthropogenic Impact ◽  
Effect Of Temperature ◽  
Freshwater Environment ◽  
Intermolt Period ◽  
Different Temperatures ◽  
Cephalothorax Length ◽  
Survival And Growth ◽  
Size Increment

During the two-month rearing period, the effect of four water temperatures (15°C, 20°C, 25°C and 30°C) on survival rate, number of molts, and growth rate (molt increment and intermolt period) of juvenile Macrobrachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili, 1901 prawns was evaluated in laboratory conditions. The two species showed some similarities in their both survival and growth pattern at different temperatures. The survival rate was highest at 20°C and 25°C, decreasing at the lowest temperature. The number of molts increased at higher temperatures, ranging the intermolt period from 22.2 days to 9.9 days, for M. borellii, and from 20.8 to 9.5 days for P. argentinus, corresponding those values to 15°C and 30°C, respectively. No difference between species was noted in the intermolt period. The size increment by molting increased significantly from 15°C to 25°C, whereas a reduction in the growth of prawns was observed at 30°C. Significant differences among temperatures were found in the slope of regressions between the size increment by molting and the cephalothorax length. M. borellii showed a significantly higher tolerance to elevated temperature and a faster growth (about twice at 25°C) than P. argentinus. These differences could provide M. borellii a competitive advantage for a better adaptation to the dynamic of freshwater environment, especially in areas with anthropogenic impact.

scholarly journals Yellow Mealworm Larvae (Tenebrio molitor) Fed Mycotoxin-Contaminated Wheat—A Possible Safe, Sustainable Protein Source for Animal Feed?

Toxins ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 282 ◽  
Author(s):  
Carlos Ochoa Sanabria ◽  
Natacha Hogan ◽  
Kayla Madder ◽  
Cedric Gillott ◽  
Barry Blakley ◽  
...  
Keyword(s):  
Animal Feed ◽  
Control Diet ◽  
Average Daily Gain ◽  
Amino Acid Content ◽  
Tenebrio Molitor ◽  
Protein Source ◽  
Yellow Mealworm ◽  
Nutritional Analysis ◽  
Kg Medium ◽  
Mealworm Larvae

The aim of this study was to determine the potential for accumulation of deoxynivalenol (DON) in yellow mealworm larvae (Tenebrio molitor) reared on high DON Fusarium-infected wheat and investigate the effects on production, survival and nutritional traits. Wheat containing 200 μg/kg DON was used as the control diet. A different source of wheat was sorted into six fractions and mixed to obtain low (2000 μg/kg), medium (10,000 μg/kg) and high (12,000 μg/kg) levels of DON. Each diet was replicated five times with 300 or 200 mealworms per replicate for the feeding and breeding trials, respectively. Trial termination occurred when the first two pupae were observed (32–34 days). There was no difference in the concentrations of DON detected in the larvae between diets that ranged from 122 ± 19.3 to 136 ± 40.5 μg/kg (p = 0.88). Excretion of DON was 131, 324, 230 and 742 μg/kg for control, low, medium and high, respectively. Nutritional analysis of larvae showed maximum crude protein of 52% and crude fat of 36%. Ash, fiber, chitin, fatty-acids and amino-acid content were consistent across diets. Survival was greater than 96% for all life stages and average daily gain ranged from 1.9 ± 0.1 to 2.1 ± 0.1 mg/day per mealworm. Larvae accumulated low levels of DON from Fusarium-infected wheat diets suggesting contaminated wheat could be used to produce a sustainable, safe protein source.

scholarly journals Effect of Alkalinity on Survival Rate and Growth of Siam Patin Catfish (Pangasius sp.) fry

2007 ◽  
Vol 4 (1) ◽  
pp. 53
Author(s):  
D. Djokosetiyanto ◽  
R.K. Dongoran ◽  
E. Supriyono
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Fish Larvae ◽  
Daily Growth Rate ◽  
Daily Growth ◽  
Survival And Growth

<p>This study was conducted to examine the effect of alkalinity on survival and growth of Siam patin catfish (<em>Pangasius</em> sp.).  Fish larvae were reared in aquaria in density of 4 fishes per liter.  Water alkalinity examined was 15 ppm CaCO<sub>3</sub> as control, and 25, 50, and 75 ppm CaCO<sub>3 </sub>as treatments.  During first 7 days, larvae were fed on nauplii <em>Artemia</em> sp. 4 times daily and continuing fed on <em>Tubifex</em> sp. for 23 days.  The results of study showed that higher survival rate was obtained in treatment 50 ppm CaCO<sub>3</sub> (94.16%).  Higher daily growth rate was also achieved by that treatment.</p> <p>Keywords: Siam patin catfish, <em>Pangasius</em>, Alkalinity, CaCO<sub>3</sub></p> <p><sub> </sub></p> <p>ABSTRAK</p> <p>Penelitian ini bertujuan untuk mengetahui pengaruh alkalinitas terhadap kelangsungan hidup dan pertumbuhan larva ikan patin Siam (<em>Pangasius</em> sp.).  Larva ikan patin dipelihara dalam akuarium dengan kepadatan 4 ekor/L.  Alkalinitas air yang digunakan adalah 15 ppm CaCO<sub>3</sub> sebagai kontrol, dan perlakuan 25, 50 serta 75 ppm CaCO<sub>3</sub>. Selama 7 hari pertama, pakan yang diberikan berupa naupli A<em>rtemia</em> sp. setiap 4 jam sekali dan diteruskan dengan cacing sutera (<em>Tubifex</em> sp.) selama 23 hari.  Hasil penelitian menunjukkan bahwa kelangsungan hidup larva tertinggi diperoleh pada perlakuan alkalinitas 50 ppm CaCO<sub>3 </sub> (94,16%).  Laju pertumbuhan harian tertinggi juga diperoleh pada perlakuan alkalinitas 50 ppm CaCO<sub>3 </sub>(6,65%).  </p> <p>Kata kunci: ikan patin Siam, <em>Pangasius</em>, Alkalinitas dan CaCO<sub>3</sub></p>

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