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• Study on Artificial Diets for Rearing Predatory Mite Amblyseius swirskiiAthias-Henriot (Acari: Phytoseiidae)

  Duong Thi Nga, Nguyen Duc Tung

  Date Received: 05-08-2021 / Date Accepted: 21-01-2022

   Abstract PDF (VIETNAMESE)

  This study aimed to find out the most suitable artificial diets for rearing predatory mite Amblyseius swirskii Athias-Henriot. The experiment was conducted according to individual rearing method in an incubator at 27℃with four artificial diets, viz. TA1 as basic diet (containing sucrose, yeast extract, egg yolk powder, vitamins mix); TA2, basic diet supplemented with 20% black soldier fly pupal powder; TA3 and TA4, basic diet supplemented with 20% decapsulated and non-decapsulated TA4 of dry cysts of Artemia franciscana, respectively. The results showed that females of A. swirskii fed on TA2 and TA3 had the shortest life cycle (7.68 and 7.88 days, respectively), followed by those fed on TA4 (8.11 days) and the longest was those fed on TA1 (8.68 days).The total number of eggs laid by the females rearing on TA2, TA3 or TA4 was significantly higher than that of TA1. The intrinsic rate of increase (rm) of the females fed on TA2 (0.182), TA3 (0.176) and TA4 (0.174) were significantly higher than those fed on TA1 (0.151). In conclusion, the artificial diets TA2, TA3 and TA4 can be used in mass rearing A.swirskii, and can also be used as supplemental diets for supporting the mite population on crops in the absence or lack of prey.

• Effect of Different Dietary Protein Levels on Growth and Reproductive Characteristics of Artemia franciscana Vinh Chau

  Duong Thi My Han, Nguyen Van Hoa, Nguyen Thi Ngoc Anh

  Date Received: 20-08-2015 / Date Accepted: 22-01-2016

   Abstract PDF (VIETNAMESE)

  This study was conducted to evaluate the effect of dietary protein levels in formulated feeds on survival, growth and reproductive characteristics of Artemia franciscanaVinh Chau in laboratory conditions. Experiment consisted of 7 feeding treatments including of commercial shrimp feed No. 0 (control feed) and 6 formulated feeds containing 20, 25, 30, 35, 40 and 45% protein. The experimental process was divided into two phases (1) Communal culture,from day 0 until Artemiareachessexual maturity to determine survival and growth. (2) Individual culture,Artemiacouples were reared in 50-ml Falcon tubes to record their reproductive characteristics and life span. After 14 days of culture, survival of Artemiawas not affected by the feeding treatments, varying in the range of 87.2-95.4%; and the total length of Artemiaattainedbetween 7.00 and 8.04mm, of which the treatments from 25% to 35% protein had significantly higher values (P> 0.05) compared to other feeding treatments. The lifespan of Artemia females wassimilar among feeding treatments (44.6-48.6 days). The reproductive period, total brood number and total offspring per Artemiafemale in the 30 and 35% protein treatments were significantly higher (P> 0.05) than the control, 20% and 45% protein treatments. These results indicated that formulated feed containing 30 to35% protein could be suitable feed for growth and reproductive performance of Artemia franciscana.