13 tháng 9, 2007

Bệnh đầu vàng (Yellow head disease)

Triệu chứng:

- Tôm ăn nhiều khác thường trong vài ngày, rồi bỏ ăn đột ngột
- Sau 1-2 ngày bơi lờ đờ trên mặt nước hoặc ven bờ
- Bơi không định hướng
- Lác đác tôm chết trong vó
- Chết với mức độ tăng dần
- Phần đầu ngực, gan tụy chuyển màu vàng, gan có thể có màu trắng nhạt, vàng nhạt hoặc nâu
- Thân có màu nhạt
- Tôm chết rất nhanh trong vòng 2-3 ngày (có thể gần 100%)
- Có khi dấu hiệu đầu vàng lẫn đốm trắng.

Nguyên nhân:

- Virut YHV (yellow head virus)

Lây truyền bệnh:

- Chủ yếu lây truyền theo hàng ngang.

Chữa trị:

- Cũng giống như bệnh thân đỏ - đốm trắng (SEMBV - WSSV), bệnh đầu vàng (YHV) cũng chưa có phương thức chữa nào hữu hiệu, chỉ có biện pháp phòng ngừa và ngăn chặn.

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