CHƯƠNG 6
PHẦN B
BỆNH DO NGUYÊN SINH
ĐỘNG VẬT (ngành protozoa)
I. Trùng bánh xe: Trichodinosis
1. Tên bệnh và tác nhân gây bệnh
•Ký sinh gây bệnh thuộc 3 giống Trichodina;
Trichodinella; Tripartiella
•Trùng bánh xe mặt bụng dạng hình tròn,
nhìn nghiêng có dạng hình chuông, kích
thước 50-70µm; ở giữa có hạch lớn hình
móng ngựa và hạch nhỏ hình tròn
•Có 2-3 vòng tiêm mao dùng để bơi trong
nước
•Trùng bám vào da và mang cá nhỡ vào
vòng móc bám bằng kitin ở mặt bụng, có 24
chiếc móc, phần gai hướng vào phía trong
nhìn giống như bánh xe
![Bài giảng Bệnh học thủy sản: Chương 6 - Hồ Phương Ngân (Phần C) [Mới Nhất]](https://cdn.tailieu.vn/images/document/thumbnail/2016/20160225/doinhugiobay_15/135x160/7221456371613.jpg)
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