By Gilbert Barnabe
В книге освещены биологические и экологические основы производства биокультур в воде, а также рассказывается о путях решениях проблем, возникающих во время данного процесса.
Read Online or Download Aquaculture: Biology And Ecology Of Cultured Species (Ellis Horwood Series in Aquaculture and Fisheries Support) PDF
Similar marine biology books
The sea is helping average weather switch due to its substantial capability to shop CO2, throughout the mixed activities of ocean physics, chemistry, and biology. This garage means limits the volume of human-released CO2 ultimate within the surroundings. As CO2 reacts with seawater, it generates dramatic adjustments in carbonate chemistry, together with decreases in pH and carbonate ions and a rise in bicarbonate ions.
This booklet deals an environmental-economic research of exploited ecosystems with a transparent coverage orientation. The examine strikes past conventional monetary fishery research in respects. First, numerous theoretical and numerical versions are provided that mix fiscal and ecological descriptions of fisheries.
This e-book highlights an remarkable collaboration of environmental scientists, ecologists and physicians operating jointly in this very important new self-discipline, to the advantage of human healthiness and ocean environmental integrity alike. Oceanography, toxicology, typical items chemistry, environmental microbiology, comparative animal body structure, epidemiology and public wellbeing and fitness are all lengthy tested parts of analysis of their personal correct and all give a contribution facts and services to an built-in knowing of the ways that ocean biology and chemistry have an effect on human wellbeing and fitness for greater or worse.
The Antarctic represents the final of the world's nonetheless unexplored continents. for the reason that 1985, Italy has despatched 10 expeditions to this area, 3 of these were solely dedicated to learn at the marine ecology of the Ross Sea zone. This quantity offers a world photograph of this learn. It comprises contributions on water mass features, particulate natural subject and nutrient usage, and physiological features of basic creation.
Extra resources for Aquaculture: Biology And Ecology Of Cultured Species (Ellis Horwood Series in Aquaculture and Fisheries Support)
This is impossible at present. The ideal would be to limit the development of the dinoflagellate blooms which secrete toxins which are in turn accumulated by edible molluscs. THE PRODUCTION OF AQUATIC ORGANISMS [PT. 3 Bacteria Organic matter is first utilized by bacteria. Their small size and large surface area allows the absorption of nutrients present at very low concentrations. There is therefore a commensalism in the production of dissolved organic matter by phytoplankton and its use by bacteria.
4 µm. Such organisms may reach densities of several tens of million per litre in the water. In spite of this abundance their importance was not appreciated for a long time. These species (except for the coccoliths which are identified by their calcareous skeleton) are identified by fluorescent or electron microscopy. Towards the end of the 1970s they were identified in the sea and in fresh water, opening up a debate on the true primary production of the aquatic environment. In practice the bulk of primary pelagic production is through these very small cells.
Chemical communication, based on the detection of infinitesimally low concentrations (chemoreception), has been demonstrated for many species and plays a major role in behaviour: feeding (appetence of prey), reproduction (attraction of sexes at the time of fertilization), etc. While it is known that these mediators ensure a control of the abundance of planktonic species, many other interactions remain unknown or are difficult to demonstrate. Water therefore contains substances which are capable of affecting living organisms even when found at very low levels.