Quần xã tuyến trùng làm nguồn thức ăn tự nhiên cho tôm trong mô hình nuôi sinh thái ở rừng ngập mặn huyện Năm Căn, tỉnh Cà Mau

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Tác giả: Xuân Quảng Ngô, Tấn Đức Nguyễn, Thị Mỹ Yến Nguyễn, Thành Thái Trần

Ngôn ngữ: vie

Ký hiệu phân loại: 639.5 Crustacean fisheries

Thông tin xuất bản: Công nghệ Sinh học, 2018

Mô tả vật lý: 581-588

Bộ sưu tập: Metadata

ID: 492103

Thêm vào giỏ

24 mẫu tuyến trùng được thu thập trong 8 ao nuôi tôm sinh thái thuộc 4 ấp ở xã Tam Giang, huyện Năm Căn, tỉnh Cà Mau qua 3 đợt khảo sát tương ứng với mùa khô, giao mùa và mùa mưa năm 2015. Kết quả cho thấy mật độ, thành phần giống của quần xã tuyến trùng ở khu vực nghiên cứu cao, với tổng số 111 giống, 32 họ, 10 bộ thuộc 2 lớp được ghi nhận. Mật độ phân bố của quần xã tuyến trùng cao, đặc biệt vào thời điểm giao mùa. Số lượng và thành phần giống trong quần xã giảm dần từ mùa khô sang mùa mưa. Các giống Pseudolella, Dichronema, Gomphionema, Ponponema, Halalaimus, Sphaerotheristus, Eumorpholaimus, Euleutherolaimus, Parodontophora, Ptycholaimellus, Sabatieria là những đại diện điển hình trong ao nuôi tôm sinh thái khu vực nghiên cứu. Hai giống Daptonema và Terschellingia chiếm ưu thế hoàn toàn so với các nhóm khác. Bên cạnh đó, thành phần giống của quần xã khác nhau theo thời gian, số lượng giống trong mùa khô cao hơn mùa mưa.Free-living nematodes were investigated in order to understand as the natural food for shirmp in the model of ecological mangrove - shirmp farm in mangroves forest according to their composition and densities by seasonal changes. Twenty - four samples of free living nematodes were collected in 8 ecological shrimp ponds (three replicate per pond) in 4 hamlets of Tam Giang commune, Nam Can district, Ca Mau province. Three sampling campaigns were carried out during dry, transitional and rainy seasons in year 2015. In total of 111 nematode genera, 32 families, 10 orders belong to 2 classes of free living nematodes were identified in these mangrove shrimp ponds. Nematode genera richness were quite high, and significant different among three sampling times while their density in the rainy season was considerably higher than such of the dry season. Some genera Pseudolella, Dichronema, Gomphionema, Ponponema, Halalaimus, Sphaerotheristus, Eumorpholaimus, Euleutherolaimus, Parodontophora, Ptycholaimellus, and Sabatieria were typical in these mangrove areas. Especially, two genera Daptonema and Terschellingia develop dominantly in 3 sampling campaigns. Additionally, a significant number of nematode genera were found in all sampling times whereas some other genera only represent in one season. Desities of nematode communities were recognised rather high. Average densities and standard deviation in each mangrove shrimp ponds ranged from 222 ± 122 (individual / 10 cm2 ) to 7255 ± 5454 (individual / 10 cm2 ). These characteristic of free living nematode communities in the ecological model of mangrove - shirmp ponds might provide suitable natural food source for shirmps and enrich the benthic foodweb.

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