Marine Biology

Aquaculture: Biology And Ecology Of Cultured Species (Ellis by Gilbert Barnabe

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.

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Extra resources for Aquaculture: Biology And Ecology Of Cultured Species (Ellis Horwood Series in Aquaculture and Fisheries Support)

Example text

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.

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