Ảnh hưởng của sinh khối bio-floc dạng ướt và khô đến chất lượng nước, tăng trưởng, huyết học và sinh hóa máu của cá trê đen (clarias fuscus)=Effects of wet and dry bio-floc on water quality, growth, hematological and biochemical paramaters of black catfish (clarias fuscus)

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Tác giả: Thị Phương Nhung Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ (ĐH Công nghiệp TP. HCM), 2024

Mô tả vật lý: tr.3-16

Bộ sưu tập: Báo, Tạp chí

ID: 246129

Thêm vào giỏ

Bio-floc (BFT) là khối kết dính của các loại vi khuẩn, tảo, động vật nguyên sinh, mảnh vỡ phân tử hữu cơ và sinh vật khác... Hạt floc rất giàu protein, lipit, vitamin và khoáng chất. Cá trê đen (Clarias fuscus) là loài cá có giá trị kinh tế và có thể sử dụng làm thuốc. Thịt cá có vị ngọt, thơm, không độc, có tác dụng bổ huyết, giảm đau, ích khí… Tác động của sinh khối BFT ướt và khô đối với cá trê đen đã được đánh giá trong nghiên cứu này. BFT được sản xuất trong hai bể tròn composit 1000L có bổ sung mật đường hàng ngày để điều chỉnh tỷ lệ C: N trong nước ở mức 15: 1. Sau khi thu nhận, BFT được bổ sung vào bể nuôi cá ở dạng ướt và khô. Cá trê đen được nuôi kết hợp giữa chế độ ăn nhân tạo và sinh khối BFT ướt hoặc khô, trong 8 tuần. Khi nguồn thức ăn nhân tạo giảm dần (từ 100% đến 50%) thì lượng BFT tăng theo tỷ lệ tương ứng (7 nghiệm thức). Kết quả, nồng độ nitrat, TSS, TAN… trong nước giảm mạnh ở bể nhận BFT ướt. SGR, FCR, PER, huyết học, sinh hóa máu cá ở bể nhận BFT khô kém hơn so với bể ướt. Như vậy, sử dụng sinh khối BFT ướt (50%) bổ sung vào thức ăn đã mang lại hiệu quả tích cực trong nuôi cá trê đen.Bio-flocs (BFT), the aggregates of bacteria, algae, protozoa, or other organisms along with particulate organic matters, are rich in proteins, lipids, vitamins, and minerals. Black catfish (Clarias fuscus) is an economically valuable fish species and can be used as a medicinal ingredient. Black catfish has a sweet, moist taste and mild-flavored, its flesh is non-toxic and can strengthen blood and qi as well as relieves the pain. The effects of wet and dry BFT biomass on water quality and the growth of black catfish were evaluated in this study. BFT was produced in two 1000L composite tanks with daily molasses supplement to adjust the C: N ratio in the water at a ratio of 12: 1. After that, black catfish were fed with a combination of artificial feeds and either wet or dry BFT biomass, for 8 weeks. When the artificial feed source decreased (from 100% to 50%), the amount of BFT biomass replaced correspondingly (7 treatments). The results showed that the concentration of nitrate, TSS, TAN ... of water of the wet BFT received tanks decreased strongly. Additionally, SGR, FCR, PER, hematological and biochemical parameters of black catfish in dry BFT received tanks were less than those of wet BFT received tanks. Thus, the supplement of wet BFT biomass (50%) to feed provides a more beneficial effect for farmed black catfish.

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