Đánh giá so sánh về một vũng nước tự nhiên và nhân tạo như là môi trường nuôi dưỡng cho cá hồi chinook và coho vị thành niên

Springer Science and Business Media LLC - Tập 20 - Trang 792-806 - 1997
Jessica A. Miller1, Charles A. Simenstad1
1Wetlands Ecosystem Team, University of Washington School of Fisheries WH-10, Seattle

Tóm tắt

Tốc độ tăng trưởng ngắn hạn của cơ quan tai, thời gian cư trú và nguồn thức ăn của hai loài cá hồi vị thành niên (Oncorhynchus spp.) đã được so sánh trên một vũng nước cửa sông tự nhiên và nhân tạo tại sông Chehalis ở Washington nhằm đánh giá sự tương đương chức năng của vũng nước nhân tạo trong việc cung cấp môi trường nuôi dưỡng phù hợp. Cấu trúc vi mô của cơ quan tai, dữ liệu đánh dấu và bắt lại, và nguồn thức ăn của cá hồi chinook dưới 1 tuổi, O. tshawytscha, và coho, O. kisutch, cư trú tại cả hai vũng nước trong mùa xuân năm 1991 và 1992 đã được sử dụng làm chỉ tiêu cho chất lượng môi trường nuôi dưỡng. Không phát hiện sự khác biệt đáng kể về số lượng hay chiều rộng của các gia tăng hàng ngày của cơ quan tai ở loài coho giữa hai vũng nước. Thời gian cư trú và xuất cư của cá hồi chinook vị thành niên cũng giống nhau. Côn trùng thủy sinh và côn trùng trên cạn chiếm phần lớn trong chế độ ăn của cả hai loài chinook và coho; tuy nhiên, thứ tự quan trọng của các loài mồi chính có sự khác biệt giữa các vũng nước, và cá hồi trong vũng nước nhân tạo có dạ dày rỗng hơn, có thể là do sự giảm sút trong khả năng có mồi và/hoặc hiệu quả tìm kiếm thức ăn.

Từ khóa

#cá hồi #môi trường nuôi dưỡng #cơ quan tai #đồ ăn #so sánh môi trường tự nhiên và nhân tạo #vũng nước estuarine

Tài liệu tham khảo

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