Thành phần loài, phân bố và đề xuất một số giải pháp bảo vệ ấu trùng tôm – tôm con ở vùng biển ven bờ Hải Phòng

Thành phần loài, phân bố và đề xuất một số giải pháp bảo vệ ấu trùng tôm – tôm con ở vùng biển ven bờ Hải Phòng – Quảng Ninh

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Tác giả: Văn Giang Nguyễn, Trọng Thắng Võ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Đại học Hạ Long, 2023

Mô tả vật lý: tr.97

Bộ sưu tập: Metadata

ID: 345074

Thêm vào giỏ Liên kết toàn văn

From 2015 to 2020, 85 sample vials, in total, of 5 ichthyoplankton surveys were carried out in the Hai Phong - Quang Ninh seas, including 3 surveys representing the Northeast and 2 others presenting for Southwest monsoon seasons. Initially, 34 species belonging to 15 families were identified, with 7 shrimp families dominating in quantity and frequency of occurrence, accounting for 98.39% of total shrimp larvae and juveniles obtained. The average density of shrimp-shrimp larvae reached 13,223±228 individuals/1000 m3 of seawater, in which the average density of the Southwest monsoon season reached 22,654±964 individuals/1000 m3, higher than that of the Northeast monsoon season 6,936±584 individuals/1000 m3
and there was a significant variation over time with P<
0.05. In the Northeast monsoon seasons, breeding areas of shrimp were in the coastal zones of Ha Long Bay to Cat Ba Island down to the southwest coast of Hai Phong bordering Thai Binh. In the southwest monsoon season, the distribution density tends to shift away from the shore, concentrating in the area of Tran island, the sea southeast of Hon Dau, the area between the northeast of the Long Chau archipelago up to the South of Ha Mai Island and Ngoc Vung Island. These areas could be considered to set up the forbidden or limited exploitation during spawning seasons and planning serves for fishery resource management.Từ năm 2015 – 2020, nghiên cứu đã tiến hành 5 chuyến khảo sát, trong đó có ba chuyến đại diện mùa gió Đông Bắc và hai chuyến mùa gió Tây Nam, thu thập tổng số 85 lọ mẫu ấu trùng tôm – tôm con ở vùng biển Hải Phòng - Quảng Ninh. Kết quả đã xác định được 34 loài/nhóm loài tôm thuộc 15 họ, trong đó có 7 họ tôm chiếm ưu thế về số lượng và tần suất xuất hiện. Mật độ trung bình ấu trùng tôm - tôm con đạt 13.223±228 cá thể/1000 m3 nước biển. Mật độ trung bình ấu trùng tôm - tôm con trong mùa gió Tây Nam đạt 22.654±964 cá thể/1000 m3, cao hơn mùa gió Đông Bắc đạt 6936±584 cá thể/1000 m3 và có sự biến động rõ rệt theo thời gian với P<
0,05. Trong mùa gió Đông Bắc, khu vực phân bố ấu trùng tôm - tôm con chủ yếu tập trung ở vùng biển ven bờ Vịnh Hạ Long tới đảo Cát Bà, xuống tới ven bờ Tây Nam Hải Phòng giáp Thái Bình. Trong mùa gió Tây Nam, mật độ phân bố có xu hướng dịch chuyển ra xa bờ, tập trung khu vực đảo Trần, vùng biển phía Đông Nam Hòn Dấu, khu vực nằm giữa phía Đông Bắc quần đảo Long Châu lên tới phía Nam đảo Hạ Mai và đảo Ngọc Vừng. Những khu vực này có thể được xem xét làm cơ sở cho việc xây dựng các khu vực cấm hoặc hạn chế khai thác trong mùa sinh sản, từ đó giúp xây dựng các định hướng bảo vệ nguồn lợi ở vùng nước ven bờ.

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