Search

Search Results

• Formulated Feed for Rainbow Trout (Oncorhynchus mykiss) The Beginning of Growing Phase

  Tran Thi Nang Thu, Tran Thi Tinh

  Date Received: 18-02-2013 / Date Accepted: 15-06-2013 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Formulated feed for rainbow trout at the beginning of growing phase from10g/fishto120g/fishwas conducted incoldwateraquaculture researchcenterin Sapa-Lao Cai. The experiment wasarrangedwithfivedifferentfeedincludingan imported feed from Finland andfourlocal formulated feed(TACB1, TACB2, TACB3, TACB4) containing46% proteinand18% lipid. Fishmealincorporationleveldecreased from62.27% to 52.75% andtheincorporationlevelofplant ingredientsincreases from14.66% to 38.4% in four local formulated feed. After75 daysofexperiment,resultsshowedthatthe growth performanceofrainbow troutarerelativelyhighintheexperimentalfeeds(from 1.43 to 1.47 g/fish/day), survivalrate high(98.0% -99.3%), lowfeedconversionratio(1.41 to 1.44). Therelative gutlength of fish wasproportional to theincorporationlevelofplant ingredients in experimental feed. The growth rate, feedconversionratioand survival rateof fish fed TACB3using56.12% fishmealand25.72% plant ingredientwere similar to fish fedFinlandfeed. The use of TACB3 can be reduce the production cost of 18% in comparison to imported feed, thus TACB3 can beusedasformulatedfeedforrainbowtrout at the beginning of growing phase.

  DOI: https://doi.org/10.31817/tckhnnvn.2013.11.3.

• Study on Maturation Broodstock Culture and Artificial Reproduction of Yellowcheek (Elopichthys bambusaRichardson, 1844)

  Nguyen Hai Son, Vo Van Binh, Dang Thi Lua

  Date Received: 25-03-2021 / Date Accepted: 22-06-2021

   Abstract PDF (VIETNAMESE)

  The study on maturation broodstock culture and artificial reproduction of yellowcheek (Elopichthys bambusaRichardson, 1844) was conducted from 12/2019 - 8/2020 at the National Freshwater Broodstocks Center. The aim of this study was to identify suitable foods for culturing maturation broodstocks, optimum hormone dose and appropriate incubation equipment for producing yellowcheek seeds. The results indicated that the use of chopped silver carp as food for culturing yellowcheek broodstock in the pond provided the higher maturation rate of broodstocks than using a food formulation consisting of 50% silver carp + 50% pellet feed and using 100% mixed pellet fish with 40% protein. Hormone dose of 60µg LRH-A + 10mg DOM/kg female gave the highest ovulation rate with the effect of hormones from 5-6 hours at 27-31C. Using Weiss incubators (Cycle tank) for incubating eggs showed a higher hatching rate (84.4%) and survival rate after 13 days (56.7%) in comparison with trays (68.7% hatching rate, survival rate 45.7%).

• Comparison of Some Plant Protein Used to Replace Fish Meal in Common Carp (Cyprinus carpio) Feeds

  Duong Văn Thanh, Tran Dinh Luan, Trần Thi Nang Thu

  Date Received: 01-11-2011 / Date Accepted: 02-02-2011 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Comparative study on utilisation efficiency of inclusion of sesame meal, rice bran and maize meal in common carp feeds was conducted with fish of 60g initial body weight. Three isoproteic (31%) and isoenergetic (15.5 MJ/kg) experimental feeds (TAvừng, TAcám gạo,TAngô) were formulated. It was found that the average daily gain (ADG) ranged from 3.1 to 3.8 g/fish/day, protein efficiency ratio (PER) varied from 1.61 to 1.95 and protein retention (PR) efficiency was between 31.11 and 38.76. All the three indicators (ADG, PER, PR) were highest in fish fed the diet containing sesame meal (TAvừng), followed by fish fed TAngô and the lowest was rice bran diet (TAcám gạo). Feed conversion ratio (FCR) ranged from 1.63 to 1.92. The cost of raw materials to achieve 1 kg of fish weight gain ranged from 22.0 to 26.5 thousand VND/kg. FCR and the cost of raw material to achieve 1 kg of fish weight gain were lowest in fish fed TAvừng and highest in fish fed TAcám gạo. The results of the present study indicated that sesame meal gave the highest utilisation efficiency, followed by maize meal and then rice bran. The conclusion should have an important practical significance in the selection of raw materials for common carp feed formulation, which would help to lower production costs and improve economic profits.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.