KẾT QUẢ BƯỚC ĐẦU NGHIÊN CỨU ĐA DẠNG THÀNH PHẦN LOÀI VÀ SINH KHỐI ĐỘNG VẬT PHÙ DU TRONG AO NUÔI CÁ MÈ TRẮNG HYPOPHTHALMICHTHYS MOLITRIX (VALENCIENNES,1884) TẠI THANH HÓA

Abstract

The study was conducted in 3 districts of Dong Son, Thieu Hoa and Yen Dinh, in Thanh Hoa province, these are the key farming districts with a larger proportion of polyculture of Silver carp Hypophthalmichthys molitrix (Valenciennes, 1884) than other districts in the province. The study results found that 04 varieties and species of zooplankton in the study area: 01 species of the genus Mongolodiaptomus (Pennak, 1951) and 03 species of Brachionus calyciflorus (Pallas, 1883); Brachionus diversicornis (Daday, 1883) and Brachionus plicatilis (Muller, 1883) of the phylum Rotifera). Feeding formula No. 2 (50% rotted manure + 50% industrial feed) with diverse species composition and biomass had the highest average density of 29,798,333.3 individuals/1 liter of water (the Formula 1 has an lowest average density of 8,982,333.3 individuals/1 liter of pond water); The pond bottom containing mud, sand and the water source in Ma River in Thieu Chinh commune has the highest density and biomass of zooplankton at 47,550,000 individuals of zooplankton/1 liter of water, the lowest was sand, mud and water source at Lake Ren, Dong Hoang commune (reaching 811,333.3 individuals of zooplankton/1 liter of water).
Keywords: Zooplankton, silver carp, Thanh Hoa province.