Suchergebnisse

Intro -- FRESHWATER ECOSYSTEMS AND AQUACULTURE RESEARCH -- FRESHWATER ECOSYSTEMS AND AQUACULTURE RESEARCH -- CONTENTS -- PREFACE -- PRODUCTION FRESH WATER FISH WITH UNCONVENTIONAL INGREDIENTS IN EGYPT -- Abstract -- Introduction -- Problems Associated with Unconventional Feedstuffs Formulation Problems -- A. Commercialized Sources, which Divided into -- B. Not Commercialized Sources as Single Cell, Protein Grasses, Leaf Protein, Yeast and Phytoplankton -- World Production from Aquaculture -- I. Unconventional Ingredients for Tilapia Feed -- 1. Soybean Meal (SBM) -- A. Production of Fingerlings from Nile Tilapia -- B. Production of Marketing Fish from Nile Tilapia -- 2. Cotton Seed Meal (CSM) -- 3. Sunflower Meal -- 4. Linseed Meal -- 5. Krill -- 6. Poultry-Products and Feather Meal -- 7. Fish By-Product Protein Concentrates -- 8. Brewers Dried Yeast (BDY) -- 9. Broad Bean Meal -- Feed Intake, Growth Performance and Feed Utilization -- Apparent Digestibility Coefficients -- 10. Plant Protein Mixture (PPM) -- 11. Yucca Schidigera -- Common Carp -- Physiology -- Habitat -- Diet -- Reproduction -- II. Unconventional Ingredients for Common Carp -- A. Cluster Bean Cyamposis Tetagonoloba -- 2. Evaluation of Linseed Meal as a Dietary Protein Source for Common Carp, Cyprinus Carpio L -- References -- NATURAL RENEWABLE WATER RESOURCESAND ECOSYSTEMS IN SUDAN -- Abstract -- 1. Introduction -- 2. Geography, Population and Climate -- 3. Economy, Agriculture and Food Security -- 4. Water Resources and Use -- 4.1. Water Resources -- 4.2. Water Use -- 5. International Water Issues -- 5.1. Water Management, Policies and Legislation Related to Water Use -- 5.1.1. Institutions -- 5.1.2. Water Management -- 5.1.3. Policies and Legislation -- 5.1.4. Finances -- 6. Irrigation and Drainage Development -- 6.1. Evolution of Irrigation Development.

The value of specially designated sites in conserving biodiversity has been a hotly debated issue for many years. The debate has recently been given fresh impetus by the creation of Natural England, the new Government Agency responsible for the protection and enhancement of the natural environment in England, and the challenges facing the management of designated sites resulting from the increasingly tangible effects of climate change. In the freshwater environment, the role of designated sites is very much under the spotlight because of the implementation of the European 'Water Framework' Directive, which aspires to holistic, ecologically-based management of aquatic habitats.This paper explores the underlying premises of, and rationale for, special site designations for wildlife, and provides a frank account of the inevitable clash of management philosophies that designated sites create in the freshwater environment, drawing on experiences of managing designated freshwater sites in England over the past decade. A positive role is outlined for designated sites in freshwater conservation, which addresses these management conflicts in a way that not only meets Government obligations towards these sites but also paves the way for enlightened, progressive management of the wider freshwater resource. As part of this account, attempts are made to clarify the relationship between key biodiversity-related policy drivers in the freshwater environment, and to explain how the spectre of climate change can be addressed within designated site management.The importance of strategic freshwater science, collaboratively designed and funded, in maximising the value of the designated freshwater site network to the wider freshwater habitat resource, is stressed.

Atmospheric Sciences; Marine & Freshwater Sciences; Environmental Management

"This text examines the impact of climate change on freshwater ecosystems, past, present and future. It especially considers the interactions between climate change and other drivers of change including hydromorphological modification, nutrient loading, acid deposition and contamination by toxic substances using evidence from palaeolimnology, time-series analysis, space-for-time substitution, laboratory and field experiments and process modelling. The book evaluates these processes in relation to extreme events, seasonal changes in ecosystems, trends over decadal-scale time periods, mitigation strategies and ecosystem recovery. The book is also concerned with how aspects of hydrophysical, hydrochemical and ecological change can be used as early indicators of climate change in aquatic ecosystems and it addresses the implications of future climate change for freshwater ecosystem management at the catchment scale. This is an ideal book for the scientific research community, but is also accessible to Masters and senior undergraduate students"--

This publication stands out from many others on fish conservation in that it deals exclusively with freshwater fish of European waters. 34 contributions offer up-to-date reviews on the conservation status of freshwater fish in 10 European countries and research results in genetics, systematics and ecology of more that 20 endangered European fish taxa. Selected examples show the changes in the fish communities of whole catchment areas under human influence in the past decades.Not only scientists in fish biology, but also fishery managers and hydraulic engineers will find new insights into the biology of endangered fish species and basic data in order to elaborate specific conservation measures for the local survival of these taxa

The North American freshwater fish fauna is the most diverse and thoroughly researched temperate fish fauna in the world. Ecology of North American Freshwater Fishes is the only textbook to provide advanced undergraduate and graduate students and researchers with an up-to-date and integrated view of the ecological and evolutionary concepts, principles, and processes involved in the formation and maintenance of this fauna. Ecology of North American Freshwater Fishes provides readers with a broad understanding of why specific species and assemblages occur in particular places. Addi.

Comprehensive handbook of seafood information!This definitive reference is the most comprehensive handbook of information ever assembled on foods and other products from fresh and marine waters. Marine and Freshwater Products Handbook covers the acquisition, handling, biology, and the science and technology of the preservation and processing of fishery and marine products. The array of topics covered includes: aquaculture fisheries management, and harvesting o fish meal and fish oil o fish protein concentrates o seaweed products o products from shell o other industrial products o bioactive com

Global climate change is a certainty. The Earth's climate has never remained static for long and the prospect for human-accelerated climate change in the near future appears likely. Freshwater systems are intimately connected to climate in several ways: they may influence global atmospheric processes affecting climate; they may be sensitive early indicators of climate change because they integrate the atmospheric and terrestrial events occurring in their catchments; and, of course, they will be affected by climate change. An improved predictive understanding of environmental effects on pattern and process in freshwater ecosystems will be invaluable as a baseline upon which to build sound protection and management policies for fresh waters. This book represents an early step towards this improved understanding. The contributors accepted the challenge to assume global warming of 2-5oC in the next century. They then explored the implications of this scenario on various freshwater ecosystems and processes. To provide a broader perspective, Firth and Fisher included several chapters which do not deal expressly with freshwater ecosystems, but rather discuss climate change in terms of causes and mechanisms, implications for water resources, and the use of remote sensing as a tool for expanding studies from local to global scale

Greater scientific knowledge, changing societal values, and legislative mandates have emphasized the importance of implementing large-scale flow experiments (FEs) downstream of dams. We provide the first global assessment of FEs to evaluate their success in advancing science and informing management decisions. Systematic review of 113 FEs across 20 countries revealed that clear articulation of experimental objectives, while not universally practiced, was crucial for achieving management outcomes and changing dam-operating policies. Furthermore, changes to dam operations were three times less likely when FEs were conducted primarily for scientific purposes. Despite the recognized importance of riverine flow regimes, four-fifths of FEs involved only discrete flow events. Over three-quarters of FEs documented both abiotic and biotic outcomes, but only one-third examined multiple taxonomic responses, thus limiting how FE results can inform holistic dam management. Future FEs will present new opportunities to advance scientifically credible water policies. ; Full Text

Since the limnological research on the man-made Brokopondo Reservoir in the 'sixties, numerous data have been collected on the ecology of Surinam rivers and swamps. This book is a compilation of these data: it is the first comprehensive survey of the aquatic ecology of one of the peripheral areas of Amazonia. The geomorphology of the country, situated on the Guyana Shield, is the main factor determining the limnological properties of rivers and creeks. This results in an overall picture that is quite different from Amazonia. The emphasis of The Ecosystems of Suriname is on the living aquatic resources, including aquatic and swamp vegetation, phyto and zooplankton, macroinvertebrates, fish, amphibians, reptiles and mammals. Although most of Suriname is still in a pristine state, the human impact on fresh waters is considerable in those areas of rapid economic development, emphasizing the necessity of conservation measures, specially tailored for aquatic ecosystems. The Ecosystems of Suriname is a valuable acquisition for all scientists, environmental managers and others interested in tropical aquatic ecology

water policy; water governance; water management; environmental law; environmental sciences; international relations

This is the first lecture in the course Freshwater Hydrobiology. It is an introductory lecture which introduces a number of basic concepts that underpin the area. This is a PowerPoint lecture which is free to use and modify. It was designed to be used in conjunction with the course text Gray, N.F. (2017) Water Science and Technology: An Introduction, published by CRC Press, Oxford. In the lecture, the following are explored: definition of hydrobiology and limnology, hydrological cycle, freshwater habitats, retention time, classification of rivers, global warming, climate change, EU water legislation, biological quality, water service cycle, catchment management, River Basin Management Plans, Water Framework Directive, Irish River Basin Districts, Environmental quality standards, and priority substances. ; 1