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

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

Sample text

2 Autotrophic nanoplankton and microplankton Diatoms are often the main constituent of the larger phytoplankton, especially in temperate and cool oceanic and coastal waters. They are able to concentrate near the surface as many are positively buoyant. In spite of this they mainly use light at the blue-green end of the spectrum (red, which only penetrates the uppermost layers of the water, may have an inhibitory effect). Their maximum rate of photosynthesis takes place at depths of 20–30 m. The size of individuals is between 20 and 200 µm but they frequently form chains several millimetres long.

Which are present in sea water but whose role is still not understood. m3) is a constituent of the exoskeleton of diatoms. Artificial sea water is used in aquaria but its composition only corresponds approximately to that of natural sea water. The formula is given by Spotte (1973). Salinity has a clear effect on the distribution of animals which usually tolerate only a narrow range of values (the exception is the brine shrimp, Artemia salina, with a salinity tolerance range of 0–200‰). Few species, apart from eels and salmonids, are found in fresh and salt waters; salinity and variations in salinity are therefore important features of any aquaculture site.

2 g C m−2 day−1. Thus, although the comparison has been made between tropical waters and deserts, the only resemblance is in the biomass. In their other characteristics (rapid growth and turnover rates) they can be compared favourably with tropical forests (Sheldon 1984). While it is well established that pico- and ultraplankton (<10 µm) are an essential component of planktonic communities, their abundance is limited by predation by flagellates, ciliates and rotifers (in fresh water) but not by copepods which take larger prey.

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