Hiện trạng và phân bố nguồn giống thủy sản ở vùng biển tỉnh Bến Tre

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Tác giả: Văn Hùng Cao, Thị Liên Đào, Hoàng Nhân Từ

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học (Đại học Cần Thơ) 2023

Mô tả vật lý: 85-98

Bộ sưu tập: Metadata

ID: 409663

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Trong hai năm 2020-2021, số liệu về nguồn giống hải sản được thu thập ở vùng biển Bến Tre tại 30 trạm nghiên cứu đại diện cho hai mùa gió. Tổng số 240 mẫu bao gồm 120 mẫu trứng cá, cá con (TC-CC) và 120 mẫu ấu trùng tôm, tôm con (ATT-TC) đã được thu thập bằng lưới thu mẫu tầng mặt và thẳng đứng. Miệng lưới có gắn máy đo dòng chảy để xác định lượng nước qua lưới. Kết quả phân tích bước đầu cho thấy thành phần nguồn giống khá đa dạng với 30 loài và 41 họ cá
13 loài và 13 họ tôm. Các họ cá chiếm ưu thế cả về số lượng và tần suất xuất hiện là họ cá trỏng, cá bống trắng, cá giả bống, cá đục và cá tuyết. Các họ tôm chiếm ưu thế là họ tôm he, tôm gai, tôm moi và tôm tít. Mật độ trung bình là 5.743 trứng cá và 299 cá con/1.000m3 nước biển ở tầng nước mặt, 1.296 trứng cá và 656 cá con/1.000 m 3 nước biển ở tầng nước thẳng đứng. Mật độ ấu trùng và tôm con trung bình đạt 3.885 cá thể/1.000 m 3 nước biển trong toàn vùng biển nghiên cứu. Khu vực từ cửa Tiểu tới cửa Cổ Chiên và lân cận được ghi nhận đóng vai trò rất quan trọng, là bãi sinh sản, bãi sinh trưởng tự nhiên của nhiều loài hải sản có giá trị kinh tế quan trọng cần được bảo vệ., Tóm tắt tiếng anh, In the period 2020-2022, two surveys on the early-life stages of fishes and shrimps were conducted in the coastal waters of Ben Tre province, representing for the Northeast and Southwest monsoon seasons. The surveys were systematically designed with 30 sampling stations covering the inshore and coastal zone. A total of 120 samples of fish egg, fish and shrimp larvae were collected on the surface layer and the vertical direction tow. The results indicated the high diversity of fishes and shrimps in the early life stage in the surveyed area with 41 families of fish and 13 families of shrimp identified. The dominant fish families in terms of density distribution and frequency of occurrence were Engraulidae, Gobiidae, Pinguipedidae, Sillaginidae, and Bregmacerotidae whilst the shrimp dominant by Penaeidae, Palaemonidae, Sergestidae, and Squillidae. The average density was estimated at 5,743 eggs/1,000m3 and 299 larvae/1,000m3 for the surface layer and 1,296 eggs/1.000m3 , and 656 larvae/1.000 m3 in the vertical water column. The density of shrimp larvae within the surveyed area was estimated at 3,885 ind./1,000 m3 on average. The relatively high density of both fishes and shrimps in early-life stages was observed within an area from Tieu to Co Chien estuaries. This area is considered the potential natural breeding and nursery grounds of fishes and shrimps in the coastal waters of Ben Tre. These findings provide a useful reference for fisheries resources protection not only in Bentre province but also in Vietnam.

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