TP HCM Xuat hien so diep ngoc sau 20 nam bien mat

Sau 20 nam bien mat khong ro ly do, so diep ngoc bat dau xuat hien tro lai voi so luong lon. Trao doi voi TS, ky su Truong Trung Thu (Phong Thuy san, So Nong nghiep va Phat trien Nong thon TP.HCM) da cho biet nhu tren vao ngay 20/8.

So diep ngoc: vo so co gia tri ve my nghe, thit co the an duoc

So diep ngoc, con duoc goi diep giay hay diep tron, thuoc ho nhuyen the, co ten khoa hoc la Placuna placenta. Cach day 20 nam, loai so nay sinh song rat nhieu o Can Gio. Tuy nhien den nam 1985, loai so nay dot nhien it dan va bien mat khong ro ly do. Gan day, tai xa Thanh An, huyen Can Gio, TP HCM, so diep ngoc bat dau xuat hien lai voi so luong lon. Theo ket qua khao sat cua So NN&PTNT, so diep ngoc co mat tu bai boi song Chiem keo dai tu Kenh 50 den rach Ca Nham, tren mot dien tich rong 60-70ha.

Thoi diem doan khao sat den, tai cac bai chi con lai so diep con co kich thuoc nho hon 50mm.Ong Nguyen Tho Dan, Phong Kinh te huyen Can Gio, cho hay: Thay so "tro ve" sinh song, mot so dan o xa Thanh An da bat va dem ban, do thit so diep ngoc co gia tri ve mat thuc pham. Truoc nguy co giam sut ve nguon loi loai diep ngoc do khai thac bua bai, UBND xa Thanh An da khoanh vung va co cac bien phap quan ly.

So diep ngoc dang hinh tron, ben trong so co vien ngoc nho nen con duoc goi la diep ngoc.

Theo PGS TS Hoang Duc Dat, Vien Sinh hoc Nhiet doi, truoc day, so diep ngoc song nhieu tai cac vung bai trieu, huyen Can Gio, nhat la dao Thanh An. Ly giai viec so diep ngoc tro lai sinh song, PGS Dat cho rang co the do moi truong day cua bien thay doi, nguon nuoc sach hon va it bun, thich hop cho dieu kien song cua so diep ngoc.

Cuc Quan ly Chat luong va Bao ve Nguon loi Thuy san TP.HCM cung da co cong van trinh UBND TP.HCM de nghi khoanh vung so diep ngoc va cam khai thac trong hai nam.

Theo ky su Trung Thu, hai nam la thoi gian de so diep ngoc co the sinh san va phat trien. Trong thoi gian do, So NN&PTNT se phoi hop voi cac nha khoa hoc de khao sat, dieu tra ve tru luong, mat do sinh san cung nhu nhung tac dong moi truong doi voi loai nhuyen the nay nham bao ve nguon loi diep ngoc tai Can Gio. Ngoai ra, se co mot cuoc dieu tra khao sat ve da dang sinh hoc cua rung Can Gio sau hon 30 nam trong rung.

Phan Thu Thao