rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Nghiên cứu ương ấu trùng tôm càng xanh (Macrobrachium rosenbergii) bằng công nghệ biofloc
  title info:
    sub title: Luận văn tốt nghiệp Cao học. Chuyên ngành Nuôi trồng thủy sản
  title info: title
  name:
    name part: Lê, Thanh Nghị
    role:
      role term: creator
  type of resource: text
  origin info:
    place:
      place term: xx
    place:
      place term: Cần Thơ
    publisher: Trường Đại học Cần Thơ
    date issued: 2020
    date issued: 9999
    issuance: monographic
  language:
    language term: und
  physical description:
    form: print
  abstract: Nghiên cứu nhằm tìm ra nguồn carbon và tỷ lệ C:N thích hợp lên tăng trưởng và tỷ lệ sống của ấu trùng và hậu ấu trùng tôm càng xanh ương theo công nghệ biofloc. Nghiên cứu được thực hiện với 2 thí nghiệm. Thí nghiệm (1) ương ấu trùng tôm càng xanh theo công nghệ biofloc với các nguồn carbon khác nhau gồm 4 nghiệm thức là: (i) Không bổ sung nguồn carbon; (ii) Bổ sung bột gạo (iii) Bổ sung cám gạo; (iv) Bổ sung đường cát. Thí nghiệm (2) ương ấu trùng tôm càng xanh theo công nghệ biofloc với tỷ lệ C:N khác nhau gồm 5 nghiệm thức được bố trí hoàn toàn ngẫu nhiên, 3 lần lặp lại, với các tỷ lệ C:N khác nhau là 10; 12,5; 15; 17,5 và 20. Bể ương tôm bằng composit có thể tích 500L, độ mặn 12‰, mật độ 60 con/L. Kết quả thí nghiệm 1 và 2 cho thấy các chỉ tiêu môi trường, biofloc và các chỉ tiêu vi sinh nằm trong khoảng thích hợp cho tôm sinh trưởng và phát triển tốt. Tôm PL-15 ở nghiệm thức bổ sung đường cát có tăng trưởng về chiều dài (11,7±0,3 mm), tỷ lệ sống (59,3±8,7 %) và năng suất (35.57±5.219 con/m³) cao nhất khác biệt có ý nghĩa thống kê (p<0,05) so với các nghiệm thức còn lại. Kết quả thí nghiệm 2 cho thấy tôm ở nghiệm thức tỉ lệ C:N=17,5 cho kết quả tăng trưởng chiều dài PL-15 cao nhất (11,8±0,1 mm) khác biệt có ý nghĩa thống kê (p<0,05) so với nghiệm thức tỷ lệ C:N=10, nhưng khác biệt không có ý nghĩa thống kê (p>0,05) so với các nghiệm thức còn lại. Tỷ lệ sống (56,8±1,9%) và năng suất (34.080±1.111 con/m³) tôm PL-15 cao nhất ở nghiệm thức tỉ lệ C:N=17,5 khác biệt có ý nghĩa thống kê (p<0,05) so với các nghiệm thức còn lại. Vì vậy, có thể kết luận rằng, bổ sung đường cát với tỉ lệ C…
  note: Lê Thanh Nghị ; Trần Ngọc Hải (Cán bộ hướng dẫn)
  subject:
    topic: Nuôi tôm,Shrimp culture
  classification: 639.64
  classification: Ngh300
  record info:
    record creation date: 210402
    record identifier: CTU_238482