Cach nhan dang cac loai hai san doc

Ngoai cac loai ca noc doc, con co mot so loai khac nhu oc, cua, bach tuoc xanh... Vien Hai duong hoc da dua ra cach nhan dang mot so loai hai san co doc to cao.

O bien co nhieu loai ca doc nhu ca mat ngua, ca hong cham bac, ca mat quy, ca duoi... Trong do, doc nhat la ca noc. Doc to chua trong ca noc thuoc dang Tetradotoxin tung gay ra nhieu vu ngo doc chet nguoi. Trong so 66 loai ca noc phat hien tai Viet Nam, co 21 loai khong co doc to. Song, de nhan biet loai nao co doc to va loai nao khong co doc la dieu rat kho. Vi vay, tot nhat la khong nen an ca noc. Con cac loai ca mat ngua, mat quy co hinh thu xau xi, gai goc nen de phan biet.

Cac loai cua doc:

- Cua mat quy: Cua song co mau xanh da troi hoi nga xanh la cay voi nhung not mau trang, nau va vang. Ngon cac chan kim co mau nau den. Cua mat quy co o cac tinh ven bien mien trung tu Da Nang den Vung Tau, thuong gap o cac ran can, vung trieu thap.

- Cua hat: Cua song co mau xanh la cay dam hoi vang. Doi khi mau nau vang hoac hoi do tia. Dot ngon cac chan kim co mau den. Loai cua hat duoc tim thay tren ran san ho song, o do sau khoang 3m, tai Hon Tam (Nha Trang).

- Cua Pholoria: Cua song co mau xanh da troi nhat hoi luc, voi nhung vet loang mau do tia sam hoi nau hoac hoi xanh la cay tren mat lung vo dau nguc. Cac ngon chan kim mau nau sam. Cua Pholoria song o Bai Dong (Mui Chut, Nha Trang), duoc tim thay tren ran san ho chet, o muc trieu thap.

Oc doc:

- Oc coi dia ly: Vo co dang hinh trung dai. Vo mong, nhe, de vo, co mau trang hoi xanh chuyen sang hoi tim. Hoa van cua vo hinh mang luoi mau nau va hai hang vet lon mau nau.

- Oc coi hoa luoi: Vo co dang hinh trung thuon. Vo day, chac va nang. Mau sac cua vo thay doi, thuong la trang hoi xanh. Hoa van mau nau hoi vang co hinh mang luoi khong deu, diem nhung vet nau lon.

(Theo Nong Thon Ngay Nay)