Bài giảng Quản lý chất lượng môi trường trong nuôi trồng thủy sản: Phần 2 gồm có 3 chương trình bày về khái niệm về vi sinh vật trong nguồn nước; ảnh hưởng của chất lượng nước ao đến môi trường xung quanh và chất lượng sản phẩm; tiến trình quan trắc chất lượng môi trường nước phục vụ nuôi trồng thủy sản. | QUẢN LÝ CHẤT LƯỢNG MÔI TRƯỜNG TRONG NUÔI TRỒNG THỦY SẢN Chương 3: Khái niệm về vi sinh vật trong nguồn nước Microbial Interactions with Macroorganisms Aquatic environment is relatively rich in microorganisms Up to 105 to 106 cells / mL Cilliates, other protists, and viruses Macroorganisms in aquatic environment Constantly exposed to microorganisms Historical perspectives Changes during storage Effects on spoilage Relationship between environmental and fish microflora Basis for monitoring changes in fish farms Disease causing bacteria Human Fish & Shellfish Increasingly, more focus on normal microflora and their interactions with the host organisms Microbiology of bivalve mollusks Microorganisms as food Natural microflora Filter feeders and the ecosystem Hansen and Olafsen, 1999; Maeda, 2002 Microorganisms as food Filter feeders (Suspension feeders) Feed on microorganisms that they filter out of the environment Clams, oysters, barnacles, sponge Deposit feeders Feed on microorganisms . | QUẢN LÝ CHẤT LƯỢNG MÔI TRƯỜNG TRONG NUÔI TRỒNG THỦY SẢN Chương 3: Khái niệm về vi sinh vật trong nguồn nước Microbial Interactions with Macroorganisms Aquatic environment is relatively rich in microorganisms Up to 105 to 106 cells / mL Cilliates, other protists, and viruses Macroorganisms in aquatic environment Constantly exposed to microorganisms Historical perspectives Changes during storage Effects on spoilage Relationship between environmental and fish microflora Basis for monitoring changes in fish farms Disease causing bacteria Human Fish & Shellfish Increasingly, more focus on normal microflora and their interactions with the host organisms Microbiology of bivalve mollusks Microorganisms as food Natural microflora Filter feeders and the ecosystem Hansen and Olafsen, 1999; Maeda, 2002 Microorganisms as food Filter feeders (Suspension feeders) Feed on microorganisms that they filter out of the environment Clams, oysters, barnacles, sponge Deposit feeders Feed on microorganisms that coats the surface of sediments and soil particles Worms, fiddler crab Larval forms of animals may require smaller microorganisms such as bacteria, while an adult may prefer larger microorganisms such as flagellated protists and algae Oyster anatomy lab- Oyster anatomy Draw water in over its gills through the beating of cilia Suspended food (plankton) and particles are trapped in the mucus of the gills Sort by labial palps and transport to the mouth, eaten, digested, and feces expelled Pseudofeces = particles which are not sorted as food and are rejected through the mouth Affect by temperature Greatest when water temperature > 50°F (~10°C) Labial palps Visceral mass Lower intestines Rectum and anus Oyster filtering mechanism lab- Natural microflora of mussels and oysters A majority of isolates are gram-negative (68%) and aerobic (76%) bacteria Predominant flora: Vibrio, Pseudomonas, .
