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The efficient and profitable production of fish, crustaceans, and other aquatic organisms in aquaculture depends on a suitable environment in which they can reproduce and grow. Because those organisms live in water, the major environ mental concern within the culture system is water quality. Water supplies for aquaculture systems may naturally be oflow quality or polluted by human activity, but in most instances, the primary reason for water quality impairment is the culture activity itself. Manures, fertilizers, and feeds applied to ponds to enhance production only can be partially converted to animal biomass. Thus, at moderate and high production levels, the inputs of nutrients and organic matter to culture units may exceed the assimilative capacity of the ecosystems. The result is deteriorating water quality which stresses the culture species, and stress leads to poor growth, greater incidence of disease, increased mortality, and low produc tion. Effluents from aquaculture systems can cause pollution of receiving waters, and pollution entering ponds in source water or chemicals added to ponds for management purposes can contaminate aquacultural products. Thus, water quality in aquaculture extends into the arenas of environmental protection and food quality and safety. A considerable body of literature on water quality management in aquaculture has been accumulated over the past 50 years. The first attempt to compile this information was a small book entitled Water Quality in Warmwater Fish Ponds (Boyd I 979a).
This volume is of great importance to humans and other living organisms. The study of water quality draws information from a variety of disciplines including chemistry, biology, mathematics, physics, engineering, and resource management. University training in water quality is often limited to specialized courses in engineering, ecology, and fisheries curricula. This book also offers a basic understanding of water quality to professionals who are not formally trained in the subject. The revised third edition updates and expands the discussion, and incorporates additional figures and illustrative problems. Improvements include a new chapter on basic chemistry, a more comprehensive chapter on hydrology, and an updated chapter on regulations and standards. Because it employs only first-year college-level chemistry and very basic physics, the book is well-suited as the foundation for a general introductory course in water quality. It is equally useful as a guide for self-study and an in-depth resource for general readers.
"Definitive guide to freshwater aquaculture"--back cover.
This guidebook, now thoroughly updated and revised in its second edition, gives comprehensive advice on the designing and setting up of monitoring programmes for the purpose of providing valid data for water quality assessments in all types of freshwater bodies. It is clearly and concisely written in order to provide the essential information for all agencies and individuals responsible for the water quality.
Annotation Aquaculture provides an attractive alternative to capture fisheries where the majority of species are overexploited and an increased yield potential is unlikely. This document reviews the standards for water and fish product quality, looks at the parameters of greatest importance to aquaculture, and discusses the scientific basis for these standards. Containing information from current literature and government standards, it provides practical, cost-effective guidelines to determine whether the quality of the proposed source water will present a significant risk to the success of a project.
This guide is designed to provide a simple means of identifying the main groups of protoza found in aquacultre ponds through photographs and drawings. This is supplemented with information on the likely effects of protoza on water quality and the health of the cultured species.
Water quality monitoring is an essential tool in the management of water resources and this book comprehensively covers the entire monitoring operation. This important text is the outcome of a collborative programme of activity between UNEP and WHO with inputs from WMO and UNESCO and draws on the international standards of the International Organization of Standardization.
The Handbook on small-scale freshwater fish farming provides a wealth of simply presented and illustrated information on freshwater fish farming in ponds, pens and cages, compiled form five booklets published on the subject in FAO s Better Farming Series between 1979 and 1990. Here is an improved format, particulars of pond, pen and cage location, construction and management are covered in outlines that can be modified to suit local conditions. The handbook is primarily intended to help workers, technicians and teachers present their knowledge of freshwater fish farming to small-scale farmers. For example, it can be used as a trainers aid in conjunction with the five original booklets, which can be distributed among trainees. The handbook ends with a set of questions that could be used to tests the trainees comprehension. Contents Chapter 1: Introduction; What is fish farming?, Why do we raise fish?, What do you need to raise fish?, How do we begin?; Chapter 2: Locating your Fish Farm; Where to put your fish pond, Water supply, Soil quality, Testing soil; Chapter 3: Constructing Fish Ponds; How large should your pond be?, How to build a 20 by 20 metre pond; Chapter 4: Inlets to Let Water into the Pond; Simple inlets, A better inlet; Chapter 5: Outlets to Let Water Out of the Pond; Simple outlets, A better outlet, Another kind of outlet: the monk, Improving your pipe outlet, Using a siphon to drain your pond; Chapter 6: Bringing Water to your Ponds; Raising the level of your water supply, Digging a supply ditch, Digging a return ditch, Building a sluice to control the water flow; Chapter 7: Controlling the Water in the Pond; Overflow, Controlling trash and fish: screens; Chapter 8: Preparing your Pond; Before filling the pond, Fertilizing the water, How to make plant compost, How to make animal compost, Building a crib, Putting fertilizer into the crib, When is your pond ready?; Chapter 9: Stocking your Pond with Baby Fish; Growing your own baby fish, Feeding the fish in your nursery pond, Using your baby fish, Transporting your baby fish, Putting baby fish into your pond; Chapter 10: Taking Care of your Pond; Chapter 11: Taking Care of your Fish; Feeding your growing fish, Providing good water for your fish; Chapter 12: Harvesting your Pond; Harvesting without draining the water, Harvesting by draining part of the water, Harvesting by draining all of the water, Harvesting fish when you have a monk, Harvesting inside the pond, Harvesting outside the pond, Harvesting many fish, What to do with your baby fish; Chapter 13: Beginning Again; Chapter 14: Improving Farm Management; Growing fish all year round, Growing only male fish; Chapter 15: Producing Fish in Pens; Locating fish pens, How large should your pen be?, Building a pen, Putting baby fish into your pen, Feeding fish in pens, Taking care of your fish in a pen, Taking care of your fish pen, Harvesting fish in pens, Starting again; Chapter 16: Producing Fish in Cages; Locating fish cages, Building a cage, Building a simple post cage, Building a simple floating cage, Building a better floating cage, Putting baby fish in the cage, Feeding fish in cages, Taking care of your fish in a cage, Taking care of the cage, Harvesting fish in cages, Starting again; Chapter 17: Your Farm and your Fish Ponds; Chapter 18: Keeping you and your Family Healthy.