Soil Chemical Analysis

Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.

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Climate Change 2007: The Physical Science Basis.

Continued growth and intensi¢cation of aquaculture production depends upon the development of sustainable protein sources to replace ¢sh meal in aquafeeds. This document reviews various plant feedstuis, which currently are or potentially may be incorporated into aquafeeds to support the sustainable production of various ¢sh species in aquaculture. The plant feedstuis considered include oilseeds, legumes and cereal grains, which traditionally have been used as protein or energy concentrates as well as novel products developed through various processing technologies. The nutritional composition of these various feedstuis are considered along with the presence of any bioactive compounds that may positively or negatively aiect the target organism. Lipid composition of these feedstuis is not speci¢cally considered although it is recognized that incorporating lipid supplements in aquafeeds to achieve proper fatty acid pro¢les to meet the metabolic requirements of ¢sh and maximize human health bene¢ts are important aspects. Speci¢c strategies and techniques to optimize the nutritional composition of plant feedstuis and limit potentially adverse eiects of bioactive compounds are also described. Such information will provide a foundation for developing strategic research plans for increasing the use of plant feedstuis in aquaculture to reduce dependence of animal feedstuis and thereby enhance the sustainability of aquaculture.

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Expanding the utilization of sustainable plant products in aquafeeds: a review

Communities of microscopic plant life, or phytoplankton, dominate the Earth's aquatic ecosystems. This important new book by Colin Reynolds covers the adaptations, physiology and population dynamics of phytoplankton communities in lakes and rivers and oceans. It provides basic information on composition, morphology and physiology of the main phyletic groups represented in marine and freshwater systems and in addition reviews recent advances in community ecology, developing an appreciation of assembly processes, co-existence and competition, disturbance and diversity. Although focussed on one group of organisms, the book develops many concepts relevant to ecology in the broadest sense, and as such will appeal to graduate students and researchers in ecology, limnology and oceanography.

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The Ecology of Phytoplankton

The repeatability of behaviour: a meta-analysis.

The effect of gas to liquid ratio on carbon dioxide removal and heat loss across a forced ventilated trickling filter

The effects of stocking density on performance, physiological and behavioural responses of African catfish (Clarias gariepinus) - 100-300 gram

In practical farm operations, fish often display a high growth variation among individuals, forcing farmers either to grade regularly or sell different and suboptimal sizes at harvesting. The background of this variation in growth is not well understood. Do fish grow differently because of individual variations in growth efficiency or differences in feeding behavior, or because of social hierarchies that affect the feeding behavior in tanks or cages?

Johan A.J. Verreth

Papers

The effect of gas to liquid ratio on carbon dioxide removal and heat loss across a forced ventilated trickling filter

The effects of stocking density on performance, physiological and behavioural responses of African catfish (Clarias gariepinus) - 100-300 gram

Netherlands study links fish feeding behavior with growth performance

Roles of ponds in integrated agriculture-aquaculture systems

Bacteria or commercial diet: the preferences of Litopenaeus vannamei