Nghiên cứu đặc điểm dinh dưỡng cá cóc (Cyclocheilichhthys enoplos) giai đoạn cá bột lên cá giống=Study on the nutritional characteristics of soldier river barb (Cyclocheilichhthy enoplos) from fry to fingerling

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Tác giả: Văn Triều Nguyễn, Anh Văn Phạm

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học (Đại học Cần Thơ), 2024

Mô tả vật lý: tr.79-86

Bộ sưu tập: Metadata

ID: 159178

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Nghiên cứu được thực hiện nhằm xác định một số đặc điểm dinh dưỡng của các cóc (Cyclocheilichthys enoplos) từ giai đoạn cá bột đến giai đoạn cá bột đến giai đoạn cá giống. Nghiên cứu được thực hiện trong ao có kích cỡ 10 m * 20 m và chiều sâu 1 m. Cá cóc bột (2 ngày tuổi) được ương với mật độ 200 con/m2 trong thời gian 30 ngày. Mẫu thực vật, động vật phiêu sinh và mẫu cá được thu vào các ngày tuổi thứ 2,3,4,5,6,7,9,11,16,21,26 và 31 để phân tích thành phần và số lượng của phiêu sinh vật và đặc điểm dinh dưỡng của cá cóc. Kết quả thể hiện rằng cá cóc (C. enolops) bắt đầu ăn thức ăn ngoài lúc 2 ngày tuổi và Rotifera (Brachionus) là thức ăn chính của cá. Tỷ lệ chiều dài ruột và chiều dài chuẩn của cá dao động 0,742-0,827. Kích cỡ miệng của cá dao động 0,23-1,19 mm. Rotifera (Brachionus) và Nauplius được cá chọn lựa vào ngày thứ 5 và thứ 6 của quá trình ương. Từ ngày thứ 9 về sau Cladocera (Moina) và Copepoda (Mesocyclops) được cá chọn lựa. Cá cóc không chọn lựa thực vật phiêu sinh làm thức ăn. Thí nghiệm chỉ ra rằng cá cóc ăn động vật phiêu sinh từ giai đoạn cá bột đến cá giống 30 ngày.The study was to determine some feeding behaviour characteristics of Soldier river barb, Cylocheilichthys enoplos from fry to fingerling. The study was conducted in earthen pond having size of 10 x20 (m) and 1 m of water depth. Two days old larvae was nursed at density of 200 fish/m2 for a period of 30 days. Phytoplankton, zooplankton and fish samples were collected at day 2,3,4,5,6,7,9,11,16,21,26 and 31 day-old post-hatching for analyzing of planktonic composition and quantity
and feeding behaviour of C. enoplos fry. The results represented that C. enoplos fry start first feeding at 2 day-olds post-hatching and fed mainly on Nauplius. The relative length of the gut (RLG) fluctuate from 0.742 - 0.827. Mouth size of fish was in range of 0.23 -1.19 mm. Rotifera (Brachionus) and Nauplius were selected on the 5th and 6th by larvae. From 9th onwards Cladocera (Moina) and Copepoda (Mesocyclops) were chosen. There was no selected phytoplankton for feeding. The experiment showed that C. enoplos was the zooplanktonic feeder from fry to fingerling stage (30-day old).

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